PBS show asserts greenhouse gases, atmospheric pollutants dimming future

Saturday, April 22, 2006

This week, the Public Broadcasting Service aired a NOVA program titled “Dimming the Earth”, which presented research by leading scientists on the complex systems of our global climate and human activity’s effect on it. One of the largest interactions (or “inputs”) humans have with the atmosphere is the ever-increasing use of fossil fuels. Consumption has risen 2% per year for this decade.

Fossil fuels burnt in factories and automobiles send their waste into our atmosphere in two forms. The first is CO2 and other greenhouse gases, which have received substantial attention in the last few years because of the way they trap heat in the atmosphere. The second is the tiny particles of sulfur dioxide, soot and ash, which scientists call aerosols (basically smog). Research into understanding the negative health effects of air pollution has resulted in the development of catalytic converters for cars as well as devices to remove particulate solids from industrial waste before it reaches the air.

More recently, atmospheric scientists have come upon the phenomenon of the reduction of direct sunlight reaching Earth’s surface— observing a nearly a 5% decline between 1960 and 1990, with evidence of a recovery since then. This has been dubbed the “global dimming” effect, and is probably due to the way these aerosols act upon clouds. It is important to realise that this does not represent a net loss of this much sunshine to the climate system – if so, large temperature declines would have been observed. Instead, the sunshine is absorbed elsewhere in the system, with a much smaller net loss.

Clouds form when moisture gathers around airborne particles, such as pollen or dust. Clouds formed by the aerosol particles emitted by fossil fuel consumption are made of many more tiny droplets than “natural” clouds. These smog-created clouds have two notable effects: they shield sunlight from reaching Earth’s surface and, due to water’s reflective nature, the millions of tiny droplets suspended in them reflect light back into space, allowing even less light to reach Earth.

Many scientists now believe that global dimming caused by these pollutants has mitigated the temperature rises brought about by global warming. Over the last thirty years, Earth’s temperature has increased by about 0.5 oC.

In the absence of global dimming, however, the Earth might be 0.3 oC warmer than it currently is, suggesting that a “tug-of-war” exists between greenhouse gases and particulates released by burning fossil fuels. Efforts to mitigate the human health dangers of smog have allowed more heat into our atmosphere and brought about a sharper increase in global warming.

Dr. James E. Hansen, professor at Columbia University and the head of the Goddard Institute for Space Studies [1], believes that if we continue on our current pattern, this warming could be as much as five degrees in the next thirty years and ten to fourteen degrees over the course of the century. Such a temperature rise would devastate life on Earth, likely bringing on a cascade of self-reinforcing warming effects. Earth’s forests drying and burning, a steady thawing of the Greenland and arctic ice sheets, and, most dangerous of all, a release of the methane hydrates that are now frozen at the bottom of the oceans, could remake the planet into something inhospitable to human life. Dr. Hansen warns that, according to his research, man has just 10 years to reduce greenhouse gases before global warming and other responses to human activity by Earth’s climate reach a “tipping point”, becoming unstoppable.

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Media round-up: April Fools’ Day 2008

Tuesday, April 1, 2008

Many media outlets traditionally deliberately spread hoaxes on April Fools’ Day, including notable quality sources such as National Geographic and Science.

The popular British tabloid The Sun wrote that French President Nicolas Sarkozy is to undergo stretch surgery to make him taller than his wife, Italian artist and model Carla Bruni. The report claimed the 5 foot 5 inch leader would be made 5 inches taller in one year using a method by Israeli professor Ura Schmuck. The Sun noted that during his visit to Britain last week, Sarkozy had high-heel shoes while his wife wore a pair of flat pumps.

The Guardian on the other hand ran an article that suggested that Carla would head an initiative by Prime Minister Gordon Brown to bring more glamour, good taste and sophistication to the U.K. general population. This would involve collaboration with Marks & Spencer for high-street fashion and Jamie Oliver for meals and wine.

BBC News had real-looking footage of flying penguins fronted by documentary host Terry Jones, which were actually an advertisement for its new iPlayer.

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Copiapó, Chile mining accident: in depth

Wednesday, October 13, 2010

The rescue of the Chilean miners trapped in the San José Mine in Copiapó, codenamed Operación San Lorenzo (San Lorenzo Operation), began on Tuesday night, at around 20:00 local time (23:00 UTC).

Florencio Ávalos was the first miner to be rescued, at 00:12 local time (03:12 UTC) on Wednesday. He was wearing a shirt signed by all his fellow miners. “The first miner is already with us. We saw it all, him hugging his wife Monica and his son Byron,” said President Piñera shortly after the first rescue. “We still have a long journey.”

“This will be recorded on every single Chilean heart forever,” Piñera added. “I hope the miners’ hope stay with us, just like the [February] earthquake victims’ [hope] and what the earthquake took off. We know that the disasters unite us all.”

All the 33 miners were rescued. The last miner, Luis Urzúa, was rescued at 21:55 Chile time (00:55 UTC). “It is a pleasure to be Chilean, [I’m] proud,” said Luis Urzúa to President Piñera. “In honour of the miners, their families, the rescuers […] let’s sing our national anthem. Viva Chile Mierda!,” said Piñera. Urzúa thanked Mining Minister Golborne and the First Lady Cecilia Morel for “fighting for their lives.” “I’m proud of my fellow miners,” Urzúa added.

Six rescuers, including a miner and a paramedic, descended to the miners’ shelter using the Fénix 3 capsule which was specially constructed for the rescue. They performed check-ups and talk with the miners before taking them back to the surface. The rescuers still don’t leave the mine.

The Fénix 3 capsules are 3.95 metres in height and weigh about 460 kilograms. They have an armour, an oxygen tube and a microphone. The occupants helmets contain an intercom to keep them in contact with the rescue team on the surface.

President of Chile Piñera assisted to the rescue. Bolivian President Evo Morales could not attend Carlos Mamani’s rescue. Mamani is the only Bolivian miner in the group.

A mass for the miners was conducted at 18:00 local time (21:00 UTC). The rescue takes between 15 and 20 minutes for each miner.

On Tuesday, Mayor of Copiapó Maglio Cicardini announced that the municipal schools in the city will have no classes this Wednesday “to transform the rescue of the Atacama’s 33 in a familiar meeting,” Radio Cooperativa reported.

“The miners will be taken to the Copiapó Regional Hospital for medical checkup, where they will have to stay for 48 hours,” Health Minister Mañalich said to Televisión Nacional de Chile.

Celebrations are taking place in several Chilean cities. In Santiago de Chile, people gathered in one of the most important points of the city, Plaza Italia. In Pichilemu, tens of cars are passing over its most important streets. In Copiapó, people gathered in its main square to assist a massive concert.

On August 5, 33 miners were trapped more than 700 meters (2,300 ft) underground, in the San José copper–gold mine, located about 40 kilometers north of Copiapó, Chile.

The youngest trapped miner is 19 years old, and the oldest is 63. There were several rescue attempts before reaching the miners’ shelter on August 22. The National Emergencies Office of Chile (ONEMI) released a list of the trapped miners on August 6, which included Franklin Lobos Ramírez, a retired footballer.

Chile is the worlds top producer of copper, according to The Economist. The San José Mine is owned by the San Esteban Mining Company (Empresa Minera San Esteban). The mine was closed down in 2007, after relatives of a miner who had died sued the company executives, but the mine was re–opened in 2008.

It was originally estimated that “it would take three to four months to complete the rescue of the trapped miners”. There were three plans to reach the miners: “Plan A” using a Strata 950 drill, “Plan B” using a Schramm T130XD drill, and “Plan C” using a RIG-422 drill. The first to reach the miners was “Plan B”, early on Saturday 9.

The last step of their rescue, announced by Health Minister Jaime Mañalich, was originally due to begin on Tuesday. Laurence Golborne, Minery Minister said “If it is possible, and the cement sets before and we don’t have any impediments to doing it, it would be wonderful,” in a press conference on Monday. The men will be extracted in a steel rescue capsule 54 cm (21 inches) in diameter.

On September 4, Chilean filmmaker Rodrigo Ortúzar announced plans to film a movie about the accident, called “Los 33” (“The 33”). The film will be released in 2011.

One miner is Bolivian, and the other 32 are Chilean.

Raúl Bustos, 40 years old, is an hydraulics engineer. He left his job in Talcahuano after the February 27 earthquake to work in the mine.

Daniel Herrera, 27 years old, is a lorry driver. He has acted as paramedic assistant in the mine. He said to La Tercera “the miners were unhappy with the psychologist in the rescue team.”

Claudio Acuña, miner, is fan of the Colo-Colo football club. The BBC reports he is aged 56, but El Comercio says he is 44.

Pedro Cortez is aged 24. He joined the mine with his friend Carlos Bugueño. Cortez is an electrician, and lost a finger in the mine a year ago.

File:Juan Aguilar with President Piñera.jpg

A native of Los Lagos, Juan Aguilar is 49 years old. Aguilar is married to Cristy Coronado, according to El Comercio. Aguilar works as a supervisor.

Mario Sepúlveda is a 39 years old electrician native of Parral; he is married. He has been the spokesman of the most of the miners’ videos. Mario Sepúlveda was the second miner to be rescued, on Wednesday at 01:10 local time (04:10 UTC).

Víctor Zamora is a 33 years old auto mechanic. Zamora is married to Jéssica Cortez, who confirmed she was pregnant while he was in the mine.

Osman Araya is 30 years old, and married. He began working as miner four months before the accident.

Florencio Ávalos is 31 years old. He is the brother of Renán Ávalos, who is also trapped in the mine. He worked as driver in San José. Ávalos filmed videos, sent later to his relatives.

Ávalos was the first miner to be rescued, on Wednesday at 00:10 local time (03:10 UTC).

Jorge Galleguillos, 56 years old, has worked all his life in the mine. He said in one video he was feeling unwell; he takes medication for hypertension.

Carlos Barrios is a 27 years old miner. His father, Antenor Barrios, told Agence France-Presse: “I find he’s very strong and has enthusiasm. He spoke loud and clear. I was excited.”

Franklin Lobos Ramírez is a 53 years old retired footballer. He played for Cobresal, Deportes Antofagasta, Club de Deportes Santiago Wanderers and Unión La Calera, and briefly for the Chile national football team. Lobos had worked as a truck driver in the mine.

Yonni Barrios, called “The Doctor”, is a 50 years old electrician. He has knowledge of first aid, and was given responsibility for monitoring the health of his colleagues. “I felt I was in hell,” Barrios said in a letter to his wife.

Carlos Bugueño, 27 years old, joined the mine with Pedro Cortez. Previously, he worked as a watchman.

Alex Vega Salazar is a 31 years old heavy machinery mechanic. He is married to Jessica Salgado, and celebrated his birthday in the mine on September 22.

Ariel Ticona is a 29 years old miner. His wife, Margarita gave birth to his daughter on September 14. She was named Esperanza (Hope), at Ticona’s request.

Richard Villarroel is a 27 years old mechanic from Coyhaique.

Edison Peña is a 34 years old miner. “I want to go out soon,” he said on his first contact with his relatives. “I want to be free, I want to see the sun,” he added. He is a fan of Elvis Presley.

Claudio Yáñez is 34 years old, and works as drill operator.

José Ojeda, 46 years old, is the master driller. Ojeda is widowed and diabetic.

Luis Urzúa is a 54 year old topographer. He is the shift-leader, and was the first miner to talk with authorities. He is known as Don Lucho among the miners. He draw plans of the area of the mine where they are trapped.

Urzúa will be the last miner to leave the mine.

José Henríquez is a 54 years old drill master. He is also an evangelical preacher, and has worked in mines for 33 years.

Víctor Segovia is a 48 years old electrician. He is in charge of writing down everything that happens in the mine.

Pablo Rojas is a 45 years old explosives loader. Married, he had been working less than six months in the mine.

Juan Illanes is a 51 year old miner. He was a sergeant in the Beagle border conflict between Chile and Argentina in 1978, the incident which almost provoked a war between the countries.

Illanes was rescued on Wednesday, at 02:07 local time (05:07 UTC).

Jimmy Sánchez, 19, is the youngest miner. He had been working in the mine for five months before the accident. His role is to check the temperature and humidity in the mine.

Samuel Ávalos is a 43 years miner. His wife Ruth said “he was addicted to the cocaine.” His role in the rescue is to check air quality in the area the miners are living. According to the BBC, “Ávalos has worked in the mine for five months.”

Mario Gómez, aged 63, is the oldest of the miners. He has worked 51 years as miner. His father was also a miner, and is nicknamed “El Navegao” (“The Sailed One”). He was thinking of retiring in November.

Gómez also wrote the message “Estamos bien en el refugio los 33” (“We are fine in the shelter the 33 [of us]”).

Segovia is 48 years old. He is married to Jessica Chille, who said “To hear his voice was a confort to my heart,” after talking with him for the first time in 24 days. His sister María, was nicknamed “La Alcaldesa” (“The Mayoress”) for her leading role at Campamento Esperanza. His father, Darío Senior, was trapped in a mine for a week, and suffered serious injuries after two other mining accidents, according to the BBC.

Carlos Mamani is a 23 years old heavy equipment operator. He is also the only non-Chilean miner; Mamani is Bolivian. He began working in the mine just five days before the accident.

He was rescued at 03:11 local time (06:11 UTC) on Wednesday.

Renán Ávalos is a 29 years old miner, single, who had been working for five months in the mine before the accident. Florencio Ávalos is his brother.

Omar Reygadas is a 56 year old electrician. He began working in the mine shortly before the accident.

Esteban Rojas is a 44 years old miner. Rojas is married to Jessica Yáñez.

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Category:Lauren Jackson

This is the category for Lauren Jackson, an Australian basketball player.

Refresh this list to see the latest articles.

  • 2 February 2013: Canberra Capitals extinguish the Fire, 76–68
  • 7 December 2012: WNBL’s Sydney Uni Flames decisively beat Canberra Capitals
  • 29 September 2012: Canberra Capitals beat Chinese women’s national B basketball team in pre-season
  • 20 August 2012: Sydney welcomes home the Australian Olympic Team
  • 23 June 2012: Basketball Australia announces final Olympic teams for the Opals and Boomers
  • 21 May 2012: Raw Opals spend week preparing for London Games
  • 16 May 2012: Australian media focuses on Olympic prospects against US for women’s basketball

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File photo of Lauren Jackson in 2012. Image: LauraHale.


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2012 Olympics clash with Ramadan

Sunday, October 15, 2006

Muslim groups from across the world are criticising the organisers of the 2012 Olympics in London after it was revealed that the games will take place over Ramadan. The most holy month in the Muslim calendar, which will take place from the 21 July to 20 August in 2012, involves fasting during daylight hours and will affect an estimated 3,000 athletes.

Joanna Manning Cooper, spokesman for the games said: “We did know about it when we submitted our bid and we have always believed that we could find ways to accommodate it.”Nevertheless, this will come as a huge embarrassment for the organisers who have tried to ensure the event involve all of Britain’s ethnic communities.A quarter of the athletes who took part in the 2004 Athens Olympics were from predominantly Muslim countries and the fast will put any athletes involved at a clear disadvantage.

The chairman of the Islamic Human Rights Commission, Massoud Shadjared said: “This is going to disadvantage the athletes and alienate the Asian communities by saying they don’t matter. It’s not only going to affect the participants, it’s going to affect all the people who want to watch the games.”

The president of the National Olympic Committee of Turkey, Togay Bayalti, said: “This will be difficult for Muslim athletes. They don’t have to observe Ramadan if they are doing sport and travelling but they will have to decide whether it is important to them. “It would be nice for the friendship of the Games if they had chosen a different date.”

The games will run from the 27 July to 12 August to coincide with the British Summer holidays. The summer holidays are a six week period running from mid July to early September. During this time, public transportation is generally less crowded and it will be easier to find the 70,000 volunteers needed to keep the games running. The International Olympics Committee has specified that the games must take place between July 15 to August 31. Giselle Davies, IOC spokesperson said, “We give a window to the five bid cities. The host city selects the dates within that window.”

The organisers are working with the Muslim Council of Great Britain to find ways around the problem.

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Can We Learn From The Baby Boomers?}

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Can we Learn from the Baby Boomers?

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Guide-to-Retirement-Plans.com

The baby boomer generation has already turned 60 (at least the oldest of them) and is undoubtedly pondering their upcoming retirement.

Are they ready?

According to a 2006 study conducted by the Center for Retirement Research at Boston University, many are not.

The study shows that median assets in retirement plansincluding 401ks and IRAsare just $60,000 for workers in their 50s. While this is not an average, this figure clearly suggests that quite a few baby boomers might be unprepared to meet their retirement needs.

Most financial planners say that retirees should withdrawal no more than 4% to 5% from their nest egg each year to try and make their money last. At $60,000 this allows for about $3,000 each year in withdrawals (not counting earnings). That isnt even enough for play money.

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What Happened to my Social Security and Pension Benefits?

While retirees can claim partial Social Security benefits at age 62, most baby Boomers will have to wait until 66 or 67 before they can claim full benefits, not 65 as it used to be. Yet another bump in the rocky road to retirement.

Of course, there may be many baby boomers that are lucky enough to have a pension benefit waiting for them when they retire. But many more have experienced the disappointment of seeing their employer scrap their defined benefit pension plans in favor of the more common defined contribution style of a Profit Sharing or 401k plan. This move may have cost those relying on this benefit dearly.

Whats a Boomer to Do?

Fortunately, not all is lost. But the obvious needs to be said: If retirement savings is lacking, people will need to work longer than they expected before they decide to hang up the suit and tie.

Heres an interesting fact from the same report by the Center for Retirement Research: For every year a worker delays retirement and continues to save and invest, monthly benefits increase by 7 – 8%.

Delaying retirement for 2 years? Go ahead and tack on an additional 15% in monthly benefits.

What about 4 years? Watch your potential benefits increase by one-third! You get the idea.

Looking Ahead

There is simply no replacement for disciplined saving and investing, and its never too late to start. If youre young, start nowyoull be way ahead of the game.

If youre not as young and you feel youre behind, take heart. Revamp your budget to remove frivolous items and focus on packing away as much as possible into your retirement plans. Its a good idea to consult with a fee-based financial planner to discuss your situation. They will create investment programs tailored to your needs and will help put you on the right track.

Many baby boomers will have to modify their retirement goals and expectations to bring them down to more realistic levels. The younger generations should use this opportunity to learn and to take the time to consider where their own retirement is headed.

www.Guide-to-Retirement-Plans.com aims to arm retirement plan investors with the knowledge needed to understand retirement plans, pick the ones suitable for them, and save and invest to ensure a fulfilling retirement.

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Can we Learn from the Baby Boomers?}

Three terrorists gunned down by police in India

Thursday, June 1, 2006An attack against the Rashtriya Swayamsevak Sangh headquarters in Nagpur was thwarted by the Maharashtra police early today morning. The militants were driving a white Ambassador car and were armed with AK-47s. They were confronted and killed by security forces as they tried to break through the security cordon surrounding the building.

Nagpur Police Commissioner S.P.S Yadav said that the car was chased by police after it broke through the first barrier about 200 metres away from the headquarters. When confronted, the militants opened fire and were killed after a five-minute shootout. Yadav also said that two policemen had been injured in the incident, one of whose condition was serious. The identities of the three men is yet to be established. A diary was also recovered from the terrorists.

A high level security alert has been declared in Nagpur and other sensitive areas in the vicinity. R.S.S chief Ram Madhav urged the government to take more steps to safeguard the offices of the organisation. This is the second time the police has prevented a major terror attack from taking place in Maharashtra. Last month the Anti-Terrorist Squad had recovered 30 kilograms of RDX, 17 AK-47 rifles and 50 hand-grenades from a jeep in Aurangabad. Eleven suspected militants were also arrested.

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N10 006 Free Demo Questions And Answers}

Submitted by: Kevin Renfro

Version: 9.0

Question: 1

A technician needs to limit the amount of broadcast traffic on a network and allow different segments to communicate with each other. Which of the following options would satisfy these requirements?

A. Add a router and enable OSPF.

B. Add a layer 3 switch and create a VLAN.

C. Add a bridge between two switches.

D. Add a firewall and implement proper ACL.

Answer: B

Explanation:

We can limit the amount of broadcast traffic on a switched network by dividing the computers into logical network segments called VLANs. A virtual local area network (VLAN) is a logical group of computers that appear to be on the same LAN even ifthey are on separate IP subnets. These logical subnets are configured in the network switches. Each VLAN is a broadcast domain meaning that only computers within the same VLAN will receive broadcast traffic.

To allow different segments (VLAN) to communicate with each other, a router is required to establish a connection between the systems. We can use a network router to route between the VLANs or we can use a Layer 3 switch. Unlike layer 2 switches that can only read the contents of the data-link layer protocol header inthe packets they process, layer 3 switches can read the (IP) addresses in the network layer protocol header as well.

Question: 2

The network install is failing redundancy testing at the MDF. The traffic being transported is a mixture of multicast and unicast signals. Which of the following would BEST handle the rerouting caused by the disruption of service?

A. Layer 3 switch

B. Proxy serve

C. Layer 2 switch

D. Smart hu

Answer: A

Explanation:

The question states that the traffic being transported is a mixture of multicast and unicast signals. There are three basic types of network transmissions: broadcasts, which are packets transmitted to every node on the network; unicasts, which are packets transmitted to just one node; and multicasts, which are packetstransmitted to a group of nodes. Multicast is a layer 3 feature of IPv4 & IPv6. Therefore, we would need a layer 3 switch (or a router) to reroute the traffic. Unlike layer 2 switches that can only read the contents of the data-link layer protocol header in the packets they process, layer 3 switches can read the (IP) addresses in the network layer protocol header as well.

Question: 3

Which of the following network devices use ACLs to prevent unauthorized access into company systems?

A. IDS

B. Firewall

C. Content filte

D. Load balance

Answer: B

Explanation:

A firewall is a system designed to prevent unauthorized access to or from a private network. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets. Firewalls use ACLs (access control lists) to determine which traffic is allowed through the firewall. All traffic entering or leaving the intranet passes through the firewall, which examines each message and blocks or allows the message depending on rules specified in the ACL. The rules in the ACL specify which combinations of source IP address, destination address in IP port numbers are allowed.

Question: 4

[youtube]http://www.youtube.com/watch?v=dToVgCGLxho[/youtube]

Which of the following is used to define how much bandwidth can be used by various protocols on the network?

A. Traffic shaping

B. High availability

C. Load balancing

D. Fault tolerance

Answer: A

Explanation:

If a network connection becomes saturated to the point where there is a significant level of contention, network latency can rise substantially. Traffic shaping is used to control the bandwidth used by network traffic. In a corporate environment, business-related traffic may be given priority over other traffic. Traffic can be prioritized based on the ports used by the application sending the traffic. Delayed traffic is stored in a buffer until the higher priority traffic has been sent.

Question: 5

Which of the following is used to authenticate remote workers who connect from offsite? (Select TWO).

A. OSPF

B. VTP trunking

C. Virtual PBX

D. RADIUS

E. 802.1x

Answer: DE

Explanation: D: A RADIUS (Remote Authentication Dial-in User Service) server is a server with a database of user accountsand passwords used as a central authentication database for users requiring network access. RADIUS servers are commonly used by ISPs to authenticate their customers Internet connections. Remote users connect to one or more Remote Access Servers. The remote access servers then forward the authentication requests to the central RADIUS server.

E: 802.1X is an IEEE Standard for Port-based Network Access Control (PNAC). It provides an authentication mechanism to devices wishing to attach to a network. 802.1X authentication involves three parties: a supplicant, an authenticator, and an authentication server. The supplicant is a client that wishes to attach to the network. The authenticator is a network device, such as an Ethernet switch, wireless access point or in this case, a remote access server and the authentication server isthe RADIUS server.

Question: 6

Which of the following provides accounting, authorization, and authentication via a centralized privileged database, as well as, challenge/response and password encryption?

A. Multifactor authentication

B. ISAKMP

C. TACACS+

D. Network access control

Answer: C

Explanation:

TACACS+ (Terminal Access Controller Access-Control System Plus) is a protocol that handles authentication, authorization, and accounting (AAA) services. Similar to RADIUS, TACACS+ is a centralized authentication solution used to provide access to network resources. TACACS+ separates the authentication, authorization, and accounting services enabling you to host each service on a separate server if required.

Question: 7

A technician needs to set aside addresses in a DHCP pool so that certain servers always receive the same address. Which of the following should be configured?

A. Leases

B. Helper addresses

C. Scopes

D. Reservations

Answer: D

Explanation:

A reservation is used in DHCP to ensure that a computer always receives the same IP address. To create a reservation, you need to know the hardware MAC address of the network interface card that should receive the IP address.For example, if Server1 has MAC address of 00:A1:FB:12:45:4C and that computer should always get

192.168.0.7 as its IP address, you can map the MAC address of Server1 with the IP address to configure reservation.

Question: 8

Joe, a network technician, is setting up a DHCP server on a LAN segment. Which of the following options should Joe configure in the DHCP scope, in order to allow hosts on that LAN segment using dynamic IPaddresses, to be able to access the Internet and internal company servers? (Select THREE).

A. Default gateway

B. Subnet mask

C. Reservations

D. TFTP serve

E. Lease expiration time of 1 day

F. DNS servers

G. Bootp

Answer: ABF

Explanation:

The question states that the client computers need to access the Internet as well as internal company servers. To access the Internet, the client computers need to be configured with an IP address with a subnet mask (answer B) and the address of the router that connects the company network to the Internet. This is known as the default gateway (answer A).To be able to resolve web page URLs to web server IP addresses, the client computers need to be configured with the address of a DNS server (answer F).

Question: 9

A technician just completed a new external website and setup access rules in the firewall. After some testing, only users outside the internal network can reach the site. The website responds to a ping from the internal network and resolves the proper public address. Which of the following could the technician do to fix this issue while causing internal users to route to the website using an internal address?

A. Configure NAT on the firewall

B. Implement a split horizon DNS

C. Place the server in the DMZ

D. Adjust the proper internal ACL

Answer: B

Explanation:

Split horizon DNS (also known as Split Brain DNS) is a mechanism for DNS servers to supply different DNS query results depending on the source of the request. This can be done by hardware-based separation but is most commonly done in software. In this question, we want external users to be able to access the website by using a public IP address. To do this, we would have an external facing DNS server hosting a DNS zone for the website domain. For the internal users, we would have an internal facing DNS server hosting a DNS zone for the website domain. The externalDNS zone will resolve the website URL to an external public IP address. The internal DNS server will resolve the website URL to an internal private IP address.

Question: 10

When configuring a new server, a technician requests that an MX record be created in DNS for the new server, but the record was not entered properly. Which of the following was MOST likely installed that required an MX record to function properly?

A. Load balance

B. FTP serve

C. Firewall DMZ

D. Mail serve

Answer: D

Explanation:

A mail exchanger record (MX record) is a DNS record used by email servers to determine the name of the email server responsible for accepting email for the recipients domain. For example a user sends an email to recipient@somedomain.com. The sending users email server will query the somedomain.com DNS zone for an MX record for the domain. The MX record will specify the hostname ofthe email server responsible for accepting email for the somedomain.com domain, for example, mailserver.somedomain.com. The sending email server will then perform a second DNS query to resolve mailserver.somedomain.com to an IP address. The sending mail server will then forward the email to the destination mail server.

Question: 11

Which of the following protocols uses label-switching routers and label-edge routers to forward traffic?

A. BGP

B. OSPF

C. IS-IS

D. MPLS

Answer: D

Explanation:

In an MPLS network, data packets are assigned labels. Packet-forwarding decisions are made solely on the contents of this label, without the need to examine the packet itself.MPLS works by prefixing packets with an MPLS header, containing one or more labels. An MPLS router that performs routing based only on the label is called a label switch router (LSR) or transit router. This is a type of router located in the middle of a MPLS network. It is responsible for switching the labelsused to route packets. When an LSR receives a packet, it uses the label included in the packet header as an index to determine the next hop on the label-switched path (LSP) and a corresponding label for the packet from a lookup table. The old label is then removed from the header and replaced with the new label before the packet is routed forward. A label edge router (LER) is a router that operates at the edge of an MPLS network and acts as the entry and exit points for the network. LERs respectively, add an MPLS label onto an incoming packet and remove it offthe outgoing packet.When forwarding IP datagrams into the MPLS domain, an LER uses routing information to determine appropriate labels to be affixed, labels the packet accordingly, and then forwards the labelled packets into the MPLS domain. Likewise, upon receiving a labelled packet which is destined to exit the MPLS domain, the LER strips off the label and forwards the resulting IP packet using normal IP forwarding rules.

Question: 12

Which of the following is MOST likely to use an RJ-11 connector to connect a computer to an ISP using a POTS line?

A. Multilayer switch

B. Access point

C. Analog modem

D. DOCSIS modem

Answer: C

Explanation:

Before ADSL broadband connections became the standard for Internet connections, computers used analog modems to connect to the Internet. By todays standards, analog modems are very slow typically offering a maximum bandwidth of 56Kbps. An analog modem (modulator/demodulator) converts (modulates) a digital signal from a computer to an analog signal to be transmitted over a standard (POTS) phone line. The modem then converts (demodulates) the incoming analog signal to digital data to be used by the computer. An analog modem uses an RJ-11 connector to connect to a phone line (POTS) in the same way a phone does.

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Wikinews interviews specialists on South Korea military parade

Sunday, October 6, 2013

On Tuesday, South Korea staged a huge military parade to mark its armed forces’ 65th anniversary in a display of long-range missiles considered a direct threat to North Korea. 11,000 troops and 190 different weapons systems were on display in the parade. Wikinews interviewed several specialists about the parade’s possible significance.

Posted in Uncategorized

Florida man charged with stealing Wi-Fi

Update since publication

This article mentions that Wi-Fi stands for “Wireless Fidelity”, although this is disputed.

Thursday, July 7, 2005

A Florida man is being charged with 3rd degree felony for logging into a private Wi-Fi (Wireless Fidelity) Internet access point without permission. Benjamin Smith III, 41, is set for a pre-trial hearing this month in the first case of its kind in the United States.

This kind of activity occurs frequently, but often goes undetected by the owners of these wireless access points (WAPs). Unauthorized users range from casual Web browsers, to users sending e-mails, to users involved in pornography or even illegal endeavours.

According to Richard Dinon, owner of the WAP Smith allegedly broke into, Smith was using a laptop in an automobile while parked outside Dinon’s residence.

There are many steps an owner of one of these access points can take to secure them from outside users. Dinon reportedly knew how to take these steps, but had not bothered because his “neighbors are older.”

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