Wi-Fi uses
Answer: C
Correct answer: radio-waves
Wi-Fi is radio: it transmits in the unlicensed 2.4 GHz and 5 GHz bands. Optical fibre and phone lines are wired media, and sound waves are not used for data networking.
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Multiplexing involves ............... path and ............. channel.
Answer: B
Correct answer: one, multiple
Multiplexing shares one physical path among multiple logical channels. That is the whole point: one expensive link carries many conversations.
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The advantage of a LAN is
Answer: A
Correct answer: sharing peripherals
A LAN lets several machines use one printer, one scanner or one file store, which is one of the original reasons for building one. Backing up and reaching the web are possible without a local network.
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Which type of network would use phone lines?
Answer: A
Correct answer: WAN
Telephone lines belong to the public network, so they are used to reach across cities and countries - that is, for a wide area network. A LAN uses its own cabling within one site.
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Servers are those computers which provide resources to other computers connected by a
Answer: A
Correct answer: network
A server provides resources to client machines over a network. The clients are what it serves; the network is what connects them.
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A combination of hardware and software that allows communication and electronic transfer of information between computers is a
Answer: B
Correct answer: network
A network is the combination of hardware - cables, adapters, switches - and software - protocols and drivers - that allows computers to exchange information. A server is one machine on it.
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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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In OSI network architecture, the routing is performed by
Answer: A
Correct answer: network layer
Choosing the path a packet takes across an internetwork is the network layer's function, which is why routers are layer 3 devices. The data link layer moves frames across a single link only.
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Which of the following refers to a small, single-site network?
Answer: A
Correct answer: PAN
Of the four, only the PAN - personal area network - is a network at all, and it is the smallest of them, covering the space around one person. DSL is an access technology, and RAM and USB are not networks.
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Which of the following topologies is not of broadcast type?
Answer: B
Correct answer: Star
In bus and ring topologies a signal reaches every station, so both are broadcast arrangements. In a star the central device receives each transmission and passes it on only where it is needed, so it is not inherently broadcast.
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