Computer Internet Questions and Answers

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.

Answer: C

Correct answer: Process the data

A computer's circuits have two states, so everything it works on - instructions and data alike - must be represented in binary before it can be processed. Storage and display are consequences of that, not the reason for it.

Answer: C

Correct answer: At the network

A packet-filtering firewall makes its decisions from the headers - source and destination address, protocol and port - which places it at the network layer, where those addresses live. Application-layer inspection belongs to a proxy firewall, which is a different design.

Answer: A

Correct answer: Netscape

Netscape is a browser, which is the program used to reach and search the web. Telnet gives a remote terminal session, FTP transfers files, and Eudora was a mail program.

Answer: A

Correct answer: To connect LANs

A bridge joins two LAN segments and forwards frames between them, learning which addresses lie on each side so that local traffic stays local. It therefore connects the segments while separating their collision domains.