Networking Basics Questions and Answers

Answer: D

Correct answer: ARPANET

ARPANET, built for the United States Advanced Research Projects Agency, carried its first message in 1969 and is the direct ancestor of the Internet. It demonstrated packet switching in practice and adopted TCP/IP in 1983. NSFNET followed in 1985 as the academic backbone that eventually replaced it, and the other two names are not networks that existed.

Answer: D

Correct answer: 12

Every port on a switch is its own collision domain, which is exactly what distinguishes a switch from a hub: frames are forwarded only towards the port where the destination MAC address resides, so two conversations on different ports never collide. Twelve ports therefore give twelve collision domains, while all twelve remain in one broadcast domain unless VLANs are configured.

Answer: A

Correct answer: A

A class A address uses one octet for the network and three for hosts, giving

Class B gives \( 2^{16} - 2 = 65{,}534 \) and class C only 254. The two subtracted addresses are the network address and the broadcast address, neither of which can be assigned to a host.

Answer: C

Correct answer: line vty 0 4

Telnet and SSH sessions arrive on the virtual terminal lines, so the password is set under line vty 0 4 - five simultaneous sessions on most routers - followed by password and login. Without a vty password configured the router refuses the connection outright, reporting that a password is required. line con 0 is the console port, line aux 0 the auxiliary port, and line telnet is not a command.

Answer: C

Correct answer: Set your console password.

line cons 0 enters line configuration mode for the console port, where password and login then set and enforce the password for anyone connecting through the physical console cable. The Telnet password belongs to line vty 0 4, a different set of lines. Entering line configuration mode neither shuts the router down nor disables the console.

Answer: B

Correct answer: distributed system

The defining property of a distributed system is transparency: the collection of independent machines presents itself to the user as one coherent system, and the middleware hides where the processing and storage actually happen. A computer network makes no such promise - the user is aware of the separate machines and addresses them individually. Every distributed system runs on a network, but not every network is a distributed system.

Answer: D

Correct answer: Switch

Edge devices are the hosts at the edge of the network that originate and consume data - PCs, smartphones, servers. A switch belongs to the network core, forwarding traffic between them without being the source or destination of the communication itself. The distinction matters in network design, since edge and core devices have quite different requirements for resilience, throughput and management.

Answer: A

Explanation: In a broadcast network, information is sent to all stations in a network whereas in a multicast network the data or information is sent to a group of stations in the network. In unicast network, information is sent to only one specific station. The broadcast address of the network is the last assigned address of the network.

Answer: C

Correct answer: show ip interface

show ip interface reports the IP configuration of each interface, including the lines showing which access list, if any, is applied inbound and outbound. show access-lists displays the contents of every list and their match counters but says nothing about where they are applied - the two questions are separate, and a list can perfectly well exist without being applied anywhere.

Answer: A

Correct answer: RFC

The Internet Engineering Task Force publishes its standards as Requests for Comments, numbered sequentially and never revised once issued - a change means a new RFC that obsoletes the old one. The name survives from the deliberately informal beginnings of the series in 1969, though an RFC on the standards track is now a formal specification. RFC 791 defines IP, RFC 793 TCP.