Networking using fibre optic cable is done as
Answer: D
Correct answer: All of the above
Fibre wins on all three counts: it carries far more bandwidth than copper, it is thin and light enough to run in great numbers, and being glass it is immune to electromagnetic interference and cannot radiate a signal to be tapped.
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What is the function of modem?
Answer: C
Correct answer: Converts analog signals to digitals and vice-versa
A modem modulates the computer's digital data onto an analogue carrier for transmission and demodulates it back at the other end, which is where its name comes from.
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A processor that collects the transmissions from several communications media and send them over a single line that operates at a higher capacity is called
Answer: A
Correct answer: multiplexor
A multiplexor combines several lower-rate streams onto one higher-rate line and separates them again at the far end. A bridge and a router forward traffic rather than combining channels.
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Which of the following items is not used in Local Area Networks (LANs)?
Answer: D
Correct answer: Modem
A LAN needs interface cards, cabling and computers. A modem is for reaching across a telephone line to somewhere else, which is a wide-area connection rather than part of the local network.
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Bandwidth refers to
Answer: D
Correct answer: the amount of information a communications medium can transmit
Bandwidth measures capacity - how much can be carried per unit of time. It is a property of the medium, not of its cost or of what a network stores.
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Which of the following is the fastest communication channel?
Answer: B
Correct answer: Optical fiber
Speed here means capacity, and optical fibre carries far more data per second than radio or microwave links - gigabits and beyond against megabits. All three propagate at close to the speed of light, so it is bandwidth rather than propagation that separates them.
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Which is the name of the network topology in which there are bidirectional links between each possible node?
Answer: D
Correct answer: Mesh
In a mesh every node has a direct bidirectional link to every other, which gives the greatest reliability at the greatest cost in cabling: n nodes need \( n(n-1)/2 \) links.
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________________ is not a web browser.
Answer: A
Correct answer: FOXPRO
Mozilla, Netscape Navigator and Internet Explorer are all browsers. FoxPro is a database system.
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Which one of the following is similar to sending an email?
Answer: D
Correct answer: Writing a letter
An e-mail is a written message addressed to a particular person and delivered to them, which is what a letter is. The other three produce something to be looked at or heard rather than sent to an address.
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It is the one which provides the facility of exchanging information between computing devices and is a combination of hardware and software.
Answer: B
Correct answer: Network
A network is the combination of hardware and software through which computing devices exchange information. A peripheral attaches to one machine and an expansion board sits inside one.
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