Networking Basics Questions and Answers

Q: Which class of IP address has the most host addresses available by default?

Correct answer: AA class A address uses one octet for the network and three for hosts, giving\[ 2^{24} - 2 = 16{,}777{,}214 \text{ hosts per network} \]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.

Q: Which of the following commands will allow you to set your Telnet password on a Cisco router?

Correct answer: line vty 0 4Telnet 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.

Q: What does the command routerA(config)#line cons 0 allow you to perform next?

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.

Q: When collection of various computers seems a single coherent system to its client, then it is called:

Correct answer: distributed systemThe 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.

Q: Which of this is not a network edge device?

Correct answer: SwitchEdge 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.

Q: Which command is used to determine if an IP access list is enabled on a particular interface?

Correct answer: show ip interfaceshow 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.

Q: The IETF standards documents are called ________

Correct answer: RFCThe 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.

Q: Three or more devices share a link in ________ connection:

Correct answer: MultipointIn a multipoint, or multidrop, connection more than two devices share a single link, so the capacity is shared - spatially if they can transmit at once, or in time if they must take turns. A point-to-point connection dedicates the whole link to two devices. Simplex describes the direction of flow rather than the number of devices, so it answers a different question altogether.

91.

Which class of IP address has the most host addresses available by default?

A.A
B.B
C.C
D.A and B

Answer: A

Correct answer: A

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

\[ 2^{24} - 2 = 16{,}777{,}214 \text{ hosts per network} \]

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.

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92.

Which of the following commands will allow you to set your Telnet password on a Cisco router?

A.line telnet 0 4
B.line aux 0 4
C.line vty 0 4
D.line con 0

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.

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93.

What does the command routerA(config)#line cons 0 allow you to perform next?

A.Set the Telnet password.
B.Shut down the router.
C.Set your console password.
D.Disable console connections.

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.

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94.

When collection of various computers seems a single coherent system to its client, then it is called:

A.computer network
B.distributed system
C.both (a) and (b)
D.none of the mentioned

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.

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95.

Which of this is not a network edge device?

A.PC
B.Smartphones
C.Servers
D.Switch

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.

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96.

Communication channel is shared by all the machines on the network in ________

A.broadcast network
B.multicast network
C. unicast network
D.anycast network

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.

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97.

Which command is used to determine if an IP access list is enabled on a particular interface?

A.show access-lists
B.show interface
C.show ip interface
D.show interface access-lists

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.

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98.

The IETF standards documents are called ________

A. RFC
B.RCF
C.ID
D.DFC

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.

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99.

Two devices are in network if:

A.a process in one device is able to exchange information with a process in another device
B.a process is running on both devices
C.PIDs of the processes running of different devices are same
D.none of the mentioned

Answer: A

Correct answer: a process in one device is able to exchange information with a process in another device

Networking is defined by the ability to exchange information, not by any similarity between the machines. Two devices are networked when a process on one can communicate with a process on the other, whatever their hardware, operating systems or process identifiers. Process IDs are local to each machine and carry no meaning across a network, and both devices running a process is neither necessary nor sufficient.

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100.

Three or more devices share a link in ________ connection:

A.Unipoint
B.Multipoint
C.Point to point
D.None of the mentioned

Answer: B

Correct answer: Multipoint

In a multipoint, or multidrop, connection more than two devices share a single link, so the capacity is shared - spatially if they can transmit at once, or in time if they must take turns. A point-to-point connection dedicates the whole link to two devices. Simplex describes the direction of flow rather than the number of devices, so it answers a different question altogether.

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