________ is one of the examples of guided media
Answer: C
Correct answer: Coaxial Cable
Guided media confine the signal to a physical path: twisted pair, coaxial cable and optical fibre. Unguided media - radio, microwave, infrared - let it travel through free space.
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The statement that holds true regarding firewall is
Answer: D
Correct answer: All of the above
All three are true of a firewall: it may be implemented in hardware or in software, it examines the traffic crossing a boundary, and what it does with each packet is decided by a configured set of rules.
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A technique that reduce the size of saved file by elimination or encoding redundancies is called
Answer: C
Correct answer: Compression
Compression reduces a file's size by removing or re-encoding repetition. It is lossless when the original can be restored exactly and lossy when some detail is discarded for a greater saving.
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The range of frequencies that a medium can pass is called
Answer: D
Correct answer: Bandwidth
Bandwidth is the range of frequencies a medium can carry, and it is because that range limits how fast data can be sent that the word came to be used for data rate as well.
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In a ring topology, the data can be transmitted only if the computer possess
Answer: A
Correct answer: Token
In a token ring only the station holding the token may transmit, and it passes the token on when finished. That is how the topology avoids collisions without any contention.
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What is an interconnected collection of piconet called ?
Answer: A
Correct answer: scatternet
Several Bluetooth piconets linked through devices that belong to more than one of them form a scatternet. The other two words are not terms in use.
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Modems are configured in such a manner that any incoming calls are automatically answered. Manufacturer provides inbuilt modems in many user computers. In this case the greatest security risk when dealing with the modems is
Answer: B
Correct answer: Remote access without the knowledge of network administrator
A modem set to answer automatically gives anyone who dials it a way into the machine, and through it into the network, that bypasses the firewall and every other perimeter control. Because it is inside the network and unrecorded, the administrator has no way of knowing the door exists.
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The first network that has planted the seeds of internet was
Answer: A
Correct answer: ARPANET
ARPANET, built for the US Defense Department's Advanced Research Projects Agency from 1969, was the first packet-switched network and the direct ancestor of the internet. NSFNET came later and carried the traffic once ARPANET was retired.
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To update a formula in a table, press the
Answer: A
Correct answer: F9 keys
F9 updates the selected field, and a formula in a table is a field, so pressing F9 recalculates it. Alt + F9 shows or hides field codes instead.
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Typical data transfer rate in LAN are of the order of
Answer: C
Correct answer: mega bits per second
LAN rates are quoted in megabits per second - 10, 100 and 1000 Mbps for the successive generations of Ethernet. Kilobit rates belong to modems and terabit rates to backbone trunks.
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