Computer Networking Quiz (or) Computer Networking MCQ (Multiple Choice Questions)

1 .

Which of the following networks extends a private network across public networks?

A)

local area network

B)

storage area network

C)

virtual private network

D)

enterprise private network

Correct Answer : Option (C) : virtual private network

Explanation : A virtual private network extends a private network across a public network, and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network.VPN provides enhanced security and online anonymity to users on the internet. It is also used to unblock websites which are unavailable in certain regions.

2 .

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

A)

line con 0

B)

line vty 0 4

C)

line aux 0 4

D)

line telnet 0 4

Correct Answer : Option (B) : line vty 0 4

Explanation : The command line vty 0 4 places you in a prompt that will allow you to set or change your Telnet password.

3 .

Which of the following services use TCP?

1. DHCP

2. SMTP

3. HTTP

4. TFTP

5. FTP

A)

1 and 2

B)

2, 3 and 5

C)

1, 2 and 4

D)

1, 3 and 4

Correct Answer : Option (B) : 2, 3 and 5

Explaination : SMTP, HTTP and FTP use TCP.

4 .

What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model?

A)

Internet

B)

Application

C)

Network Access

D)

Host-to-Host

Correct Answer : Option (D) : Host-to-Host

Explanation : The four layers of the TCP/IP stack (also called the DoD model) are Application/Process, Host-to-Host, Internet, and Network Access. The Host-to-Host layer is equivalent to the Transport layer of the OSI model.

5 .

Which of the following allows a router to respond to an ARP request that is intended for a remote host?

A)

Proxy ARP

B)

Gateway DP

C)

Inverse ARP (IARP)

D)

Reverse ARP (RARP)

Correct Answer : Option (A) : Proxy ARP

Explanation : Proxy ARP can help machines on a subnet reach remote subnets without configuring routing or a default gateway.

6 .

The DoD model (also called the TCP/IP stack) has four layers. Which layer of the DoD model is equivalent to the Network layer of the OSI model?

A)

Internet

B)

Application

C)

Host-to-Host

D)

Network Access

Correct Answer : Option (A) : Internet

Explanation : The four layers of the DoD model are Application/Process, Host-to-Host, Internet, and Network Access. The Internet layer is equivalent to the Network layer of the OSI model.

7 .

Which of the following is the decimal and hexadecimal equivalents of the binary number 10011101?

A)

159, 0x9F

B)

185, 0xB9

C)

157, 0x9D

D)

155, 0x9B

Correct Answer : Option (C) : 157, 0x9D

Explanation :

To turn a binary number into decimal, you just have to add the values of each bit that is a 1. The values of 10011101 are 128, 16, 8, 4, and 1. 128 + 16 + 8 + 4 + 1 = 157.

Hexadecimal is a base-16 number system. The values of hexadecimal are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F-16 characters total, from which to create all the numbers you'll ever need. So, if 1001 in binary is 9, then the hexadecimal equivalent is 9. Since we then have 1101, which is 13 in binary, the hexadecimal answer is D and the complete hexadecimal answer is 0x9D.

8 .

Which of the following are TCP/IP protocols used at the Application layer of the OSI model?

1. IP

2. TCP

3. Telnet

4. FTP

5. TFTP

A)

1 and 3

B)

1, 3 and 5

C)

1, 2 and 4

D)

3, 4 and 5

Correct Answer : Option (D) : 3, 4 and 5

Explaination : Telnet, File Transfer Protocol (FTP), and Trivial FTP (TFTP) are all Application layer protocols. IP is a Network layer protocol. Transmission Control Protocol (TCP) is a Transport layer protocol.

9 .

Which of the following describe the DHCP Discover message?

1. It uses FF:FF:FF:FF:FF:FF as a layer 2 broadcast.

2. It uses UDP as the Transport layer protocol.

3. It uses TCP as the Transport layer protocol.

4. It does not use a layer 2 destination address.

A)

1 only

B)

1 and 2

C)

3 and 4

D)

4 only

Correct Answer : Option (B) : 1 and 2

Explaination : A client that sends out a DHCP Discover message in order to receive an IP address sends out a broadcast at both layer 2 and layer 3. The layer 2 broadcast is all Fs in hex, or FF:FF:FF:FF:FF:FF. The layer 3 broadcast is 255.255.255.255, which means all networks and all hosts. DHCP is connectionless, which means it uses User Datagram Protocol (UDP) at the Transport layer, also called the Host-to-Host layer.

10 .

You want to implement a mechanism that automates the IP configuration, including IP address, subnet mask, default gateway, and DNS information. Which protocol will you use to accomplish this?

A)

ARP

B)

DHCP

C)

SMTP

D)

SNMP

Correct Answer : Option (B) : DHCP

Explanation : Dynamic Host Configuration Protocol (DHCP) is used to provide IP information to hosts on your network. DHCP can provide a lot of information, but the most common is IP address, subnet mask, default gateway, and DNS information.