Computer Internet Questions and Answers

Answer: C

Correct answer: Google

Google is a search engine: a service that indexes web pages and returns those matching a query. Bing, DuckDuckGo and Yahoo are others. The distractors are each a different kind of software, and the confusion between them is exactly what the question tests. Chrome is a web browser, the program that fetches and displays pages - and although it defaults to Google search, the two are distinct products. Windows is an operating system. Gmail is a webmail service. A search engine works in three stages: a crawler follows links to discover pages, an indexer builds a searchable structure from their content, and a ranking algorithm orders the results. Google’s original contribution was PageRank, which judged a page’s importance by the pages linking to it. The part of the web reachable this way is the surface web; content behind logins and forms is the deep web.

Answer: B

Correct answer: It is used for live conferencing

Video conferencing carries live picture and sound between two or more places at once, so a meeting can be held without the participants travelling. Ordinary communication and talking are what it is a particular form of, not what distinguishes it.

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.

Answer: C

Correct answer: It encrypts the connection so data cannot be read or altered in transit

HTTPS is HTTP carried inside a TLS-encrypted connection. It provides three things: confidentiality, so the traffic cannot be read; integrity, so it cannot be altered undetected; and authentication, so the browser can verify it is talking to the genuine site. The authentication rests on a certificate issued by a certificate authority, binding a public key to a domain name. The browser checks the signature chain and shows a padlock when it succeeds - and a warning when it does not, which is why certificate errors should never be clicked past. A point worth understanding: the padlock proves the connection is secure and that the site is who its certificate says. It does not prove the site is trustworthy, and phishing sites routinely use valid certificates. HTTPS is now the default; browsers mark plain HTTP as insecure, and free certificates from Let’s Encrypt removed the cost barrier.

Answer: D

Correct answer: 2, 3 and 5

Full duplex needs a dedicated link between exactly two devices, so it works switch to switch, host to host with a crossover cable, and switch to host. A hub is a shared medium by construction, so any connection involving one must be half duplex.

Answer: C

Correct answer: Bus

Classic Ethernet was a shared coaxial bus along which every station listened, and even when hubs replaced the cable the logic stayed the same: one shared medium with contention resolved by CSMA/CD.

Answer: A

Correct answer: The fastest transfer rate is 56kbps

56 kbps is the ceiling for a dial-up modem on a voice line, but cable and DSL modems run far faster, so the statement is not true of modems in general. The other two statements - the expansion of the name and the use of telephone lines - hold for the dial-up modem the question has in view.

Answer: A

Correct answer: 1 and 1

A table must have at least one cell, which means at least one row and one column.

Answer: A

Correct answer: Star

Bus and ring both deliver every signal to every station, so both are broadcast topologies. In a star the central device forwards each transmission only where it is needed, so the arrangement is not broadcast by nature.

Answer: C

Correct answer: bus

In a bus topology every station taps into the same length of cable, so one break can disable the whole segment. A star gives each node its own cable to a central device.