Questões de Concurso

Atenção: Considere o texto abaixo para responder às questões de números 56 a 60.

London becomes 4G high speed internet hotspot

    London will begin to switch on 4G high-speed mobile internet with the launch of the first large-scale public trial in Britain. Initiated by O2, Britain's second largest operator with 22 million customers, the trial involves more than 25 masts covering 15 square miles. It will run for nine months, and the equipment installed will eventually become part of O2's first commercial 4G network.
    The technology is 10 times faster at navigating the internet than the current 3G networks, which often frustrate smartphone users because they are significantly slower than the average home broadband connection. The 25 masts in London will be able to carry more data than O2's entire national 3G network.
    Britain's 4G or long-term evolution (LTE) upgrade, expected to begin in earnest in 2013 after a much delayed spectrum auction, will make mobile networks powerful enough to handle video calls, high definition TV and live multi-player gaming. About 1,000 users will be invited to join the London trial.
    Initially, the O2 trial will not involve phones, because no compatible handsets exist yet. Samsung dongles will be handed out to plug into tablets and laptop computers, as will portable miniature modems that can create small WI-FI hotspots linking into O2's 4G infrastructure or "backhaul".
    The new technology is capable of speeds of up to 150 megabits per second. During the trial, users will be more likely to experience average speeds between 25Mbps and 50Mbps. When 4G is introduced nationally the average speeds are likely to drop to between 10Mbps and 15Mbps. This is faster than 3G, which averages between 1Mbps and 1.5Mbps, and compares well with the average household, fixed line broadband connection, which rose to just under 7Mbps this year.
    Live gaming against other players and video calling without delays will become possible from phones, because the speed at which new information loads onto the screen will be reduced from 1 second to 0.07 seconds.

(Adapted from www.guardian.co.uk, Sunday 13, November, 2011)

Atenção: Considere o texto abaixo para responder às questões de números 56 a 60.

London becomes 4G high speed internet hotspot

    London will begin to switch on 4G high-speed mobile internet with the launch of the first large-scale public trial in Britain. Initiated by O2, Britain's second largest operator with 22 million customers, the trial involves more than 25 masts covering 15 square miles. It will run for nine months, and the equipment installed will eventually become part of O2's first commercial 4G network.
    The technology is 10 times faster at navigating the internet than the current 3G networks, which often frustrate smartphone users because they are significantly slower than the average home broadband connection. The 25 masts in London will be able to carry more data than O2's entire national 3G network.
    Britain's 4G or long-term evolution (LTE) upgrade, expected to begin in earnest in 2013 after a much delayed spectrum auction, will make mobile networks powerful enough to handle video calls, high definition TV and live multi-player gaming. About 1,000 users will be invited to join the London trial.
    Initially, the O2 trial will not involve phones, because no compatible handsets exist yet. Samsung dongles will be handed out to plug into tablets and laptop computers, as will portable miniature modems that can create small WI-FI hotspots linking into O2's 4G infrastructure or "backhaul".
    The new technology is capable of speeds of up to 150 megabits per second. During the trial, users will be more likely to experience average speeds between 25Mbps and 50Mbps. When 4G is introduced nationally the average speeds are likely to drop to between 10Mbps and 15Mbps. This is faster than 3G, which averages between 1Mbps and 1.5Mbps, and compares well with the average household, fixed line broadband connection, which rose to just under 7Mbps this year.
    Live gaming against other players and video calling without delays will become possible from phones, because the speed at which new information loads onto the screen will be reduced from 1 second to 0.07 seconds.

(Adapted from www.guardian.co.uk, Sunday 13, November, 2011)

Atenção: Considere o texto abaixo para responder às questões de números 56 a 60.

London becomes 4G high speed internet hotspot

    London will begin to switch on 4G high-speed mobile internet with the launch of the first large-scale public trial in Britain. Initiated by O2, Britain's second largest operator with 22 million customers, the trial involves more than 25 masts covering 15 square miles. It will run for nine months, and the equipment installed will eventually become part of O2's first commercial 4G network.
    The technology is 10 times faster at navigating the internet than the current 3G networks, which often frustrate smartphone users because they are significantly slower than the average home broadband connection. The 25 masts in London will be able to carry more data than O2's entire national 3G network.
    Britain's 4G or long-term evolution (LTE) upgrade, expected to begin in earnest in 2013 after a much delayed spectrum auction, will make mobile networks powerful enough to handle video calls, high definition TV and live multi-player gaming. About 1,000 users will be invited to join the London trial.
    Initially, the O2 trial will not involve phones, because no compatible handsets exist yet. Samsung dongles will be handed out to plug into tablets and laptop computers, as will portable miniature modems that can create small WI-FI hotspots linking into O2's 4G infrastructure or "backhaul".
    The new technology is capable of speeds of up to 150 megabits per second. During the trial, users will be more likely to experience average speeds between 25Mbps and 50Mbps. When 4G is introduced nationally the average speeds are likely to drop to between 10Mbps and 15Mbps. This is faster than 3G, which averages between 1Mbps and 1.5Mbps, and compares well with the average household, fixed line broadband connection, which rose to just under 7Mbps this year.
    Live gaming against other players and video calling without delays will become possible from phones, because the speed at which new information loads onto the screen will be reduced from 1 second to 0.07 seconds.

(Adapted from www.guardian.co.uk, Sunday 13, November, 2011)

Atenção: Considere o texto abaixo para responder às questões de números 56 a 60.

London becomes 4G high speed internet hotspot

    London will begin to switch on 4G high-speed mobile internet with the launch of the first large-scale public trial in Britain. Initiated by O2, Britain's second largest operator with 22 million customers, the trial involves more than 25 masts covering 15 square miles. It will run for nine months, and the equipment installed will eventually become part of O2's first commercial 4G network.
    The technology is 10 times faster at navigating the internet than the current 3G networks, which often frustrate smartphone users because they are significantly slower than the average home broadband connection. The 25 masts in London will be able to carry more data than O2's entire national 3G network.
    Britain's 4G or long-term evolution (LTE) upgrade, expected to begin in earnest in 2013 after a much delayed spectrum auction, will make mobile networks powerful enough to handle video calls, high definition TV and live multi-player gaming. About 1,000 users will be invited to join the London trial.
    Initially, the O2 trial will not involve phones, because no compatible handsets exist yet. Samsung dongles will be handed out to plug into tablets and laptop computers, as will portable miniature modems that can create small WI-FI hotspots linking into O2's 4G infrastructure or "backhaul".
    The new technology is capable of speeds of up to 150 megabits per second. During the trial, users will be more likely to experience average speeds between 25Mbps and 50Mbps. When 4G is introduced nationally the average speeds are likely to drop to between 10Mbps and 15Mbps. This is faster than 3G, which averages between 1Mbps and 1.5Mbps, and compares well with the average household, fixed line broadband connection, which rose to just under 7Mbps this year.
    Live gaming against other players and video calling without delays will become possible from phones, because the speed at which new information loads onto the screen will be reduced from 1 second to 0.07 seconds.

(Adapted from www.guardian.co.uk, Sunday 13, November, 2011)

Internet Architects Warn of Risks in Ultrafast Networks

    If nothing else, Arista Networks proves that two people can make more than $1 billion each building the Internet and still be worried about its reliability.
    David Cheriton, a computer science professor at Stanford known for his skills in software design, and Andreas Bechtolsheim, one of the founders of Sun Microsystems, have committed $100 million of their money, and spent half that, to shake up the business of connecting computers in the Internet’s big computing centers.
    As the Arista founders say, the promise of having access to vast amounts of data instantly, anywhere, is matched by the threat of catastrophe. People are creating more data and moving it ever faster on computer networks. The fast networks allow people to pour much more of civilization online, including not just Facebook posts and every book ever written, but all music, live video calls, and most of the information technology behind modern business, into a worldwide “cloud” of data centers. The networks are designed so as to be always available, via phone, tablet, personal computer or an increasing array of connected devices.
    Statistics dictate that the vastly greater number of transactions among computers in a world 100 times faster than today will lead to a greater number of unpredictable accidents, with less time in between them.
    Mr. Bechtolsheim says that because of the Internet’s complexity, the global network is impossible to design without bugs. Very dangerous bugs, as he describes them, capable of halting commerce, destroying financial information or enabling hostile attacks by foreign powers.
    More transactions also mean more system attacks. Even though he says there is no turning back on the online society, Mr. Cheriton worries most about security hazards. “I ...... the claim that the Chinese military can take it down in 30 seconds, no one can prove me wrong,” he said.
    The common connection among computer servers, one gigabit per second, is giving way to 10-gigabit connections, because of improvements in semiconductor design and software. Speeds of 40 gigabits, even 100 gigabits, are now used for specialty purposes like consolidating huge data streams among hundreds of thousands of computers across the globe, and that technology is headed into the mainstream. An engineering standard for a terabit per second, 1,000 gigabits, is expected in about seven years.

(Adapted from. http://www.nytimes.com/2011/11/14/technology/)