Networking Basics Questions and Answers

Q: Bluetooth is an example of:

Correct answer: personal area networkA PAN covers the space immediately around a person, typically within about ten metres, and Bluetooth is its most familiar technology - connecting a headset, keyboard or fitness tracker to a phone or computer. A LAN spans a building or campus, a WAN a country or the world, and a VPN is a logical network tunnelled over a public one rather than a matter of physical range.

Q: The first Network:

Correct answer: ARPANETARPANET, 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.

Q: How many collision domains are created when you segment a network with a 12-port switch?

Correct answer: 12Every 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.

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.

141.

Bluetooth is an example of:

A.personal area network
B.local area network
C. virtual private network
D.none of the mentioned

Answer: A

Correct answer: personal area network

A PAN covers the space immediately around a person, typically within about ten metres, and Bluetooth is its most familiar technology - connecting a headset, keyboard or fitness tracker to a phone or computer. A LAN spans a building or campus, a WAN a country or the world, and a VPN is a logical network tunnelled over a public one rather than a matter of physical range.

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142.

The first Network:

A.CNNET
B.NSFNET
C.ASAPNET
D.ARPANET

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.

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143.

How many collision domains are created when you segment a network with a 12-port switch?

A.1
B.2
C.5
D.12

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.

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144.

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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145.

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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146.

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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147.

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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148.

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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149.

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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150.

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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