Computer Internet Questions and Answers

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.

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.

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.

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.

Answer: B

Correct answer: It translates domain names into IP addresses

The Domain Name System translates human-readable names such as example.com into the numeric IP addresses machines actually use. It is often described as the telephone directory of the internet. The lookup is hierarchical and distributed. A resolver asks a root server, which directs it to the server for the top-level domain, which directs it to the authoritative server for that domain, which returns the address. Results are cached at every step with a time-to-live, which is why a DNS change takes time to propagate. The distractors describe neighbouring services. A proxy or cache stores pages for faster access. DHCP assigns IP addresses to devices joining a network. A mail filter handles spam. Because DNS was designed without security, DNSSEC was added to sign responses, and DNS over HTTPS now encrypts the queries themselves.

Answer: A

Correct answer: 8 and 72

The Font Size box lists sizes from 8 to 72 points. Larger and smaller sizes can be typed into the box, but those are the values the list offers.

Answer: D

Correct answer: Redundancy

Error detection works by sending more bits than the message strictly needs, so that a corrupted message no longer fits the pattern. That surplus is called redundancy, and parity bits, checksums and CRCs are all ways of adding it.

Answer: B

Correct answer: To quickly jump to a specific location in the document

A bookmark names a place so that it can be returned to with Go To, and so that cross-references and hyperlinks elsewhere in the document can point at it.

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.

Answer: C

Correct answer: Protocol

A protocol is the agreed set of rules governing how data is formatted, addressed, transmitted and acknowledged, so that two machines that have never met can understand each other.