Which one of the following devices is needed to communicate with computers using telephone lines?
Answer: B
Correct answer: Modem
A telephone line carries an analogue signal, so a modem is needed to convert the computer's digital data for transmission and back again on arrival.
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What is a hyperlink?
Answer: D
Correct answer: A reference in a document that takes the reader to another location when activated
A hyperlink is a reference within a document that, when activated, takes the reader to another document or to another point in the same one. Links are what make the Web a web rather than a collection of separate documents. The idea long predates the Web. Vannevar Bush described an associative machine in 1945, and Ted Nelson coined the word hypertext in the 1960s; Tim Berners-Lee’s contribution was to combine hypertext with a network protocol and a naming scheme. In HTML a link is an anchor element carrying an href attribute giving the destination URL, and the text between the tags is what the reader sees and clicks. Links are also what search engines use to discover pages, since a crawler works by following them - and Google’s original PageRank algorithm judged a page’s importance by how many pages linked to it, treating each link as a kind of vote.
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Mini computers are used as a server in
Answer: A
Correct answer: LAN
A minicomputer serving a single site's users is acting as a server on a local area network. PROM is a memory device and does not belong in the list at all.
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Which one among the following modulation scheme is supported by WiMAX?
Answer: D
Correct answer: all of the mentioned
WiMAX adapts its modulation to the quality of the link, using BPSK when conditions are poor, then QPSK, and QAM when they are good enough to carry more bits per symbol. All three are therefore part of the standard.
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For transferring files from one host to another host over a tcp network which protocol we use
Answer: B
Correct answer: FTP
FTP - File Transfer Protocol - is designed for moving files between hosts over TCP. SMTP carries mail, which is a different service.
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Which port number is used by HTTPS by default ?
Answer: D
Correct answer: 443
HTTPS listens on port 443, while plain HTTP uses port 80. The separate port lets a server offer both, and a browser assumes 443 whenever an address begins with https.
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What does the abbreviation VoIP stand for ?
Answer: C
Correct answer: Voice over Internet Protocol
VoIP carries telephone calls as data packets across an IP network rather than over a dedicated circuit. It is what underlies internet calling services, and it is why a call can cost the same regardless of distance.
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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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Which among the following is not used in media access control ?
Answer: D
Correct answer: none of the mentioned
Ethernet, DSL and FDDI all define how stations share the medium, so each includes a media access control method. None of them is the exception.
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Two or more computers connected to each other for sharing information form a
Answer: A
Correct answer: network
Two or more computers connected so as to share information form a network. A server is a role a machine may play on one, and a router is a device that joins networks together.
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