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

1 .

A subset of a network that includes all the routers but contains no loops is called _______

A)

spider tree

B)

special tree

C)

spanning tree

D)

spider structure

Correct Answer : Option (C) : spanning tree

Explanation : Spanning tree protocol (STP) is a network protocol that creates a loop free logical topology for ethernet networks. It is a layer 2 protocol that runs on bridges and switches. The main purpose of STP is to ensure that you do not create loops when you have redundant paths in your network.

2 .

The network layer protocol for internet is _______

A)

ethernet

B)

internet protocol

C)

file transfer protocol

D)

hypertext transfer protocol

Correct Answer : Option (B) : internet protocol

Explanation : There are several protocols used in Network layer. Some of them are IP, ICMP, CLNP, ARP, IPX, HRSP etc. Hypertext transfer protocol is for application layer and ethernet protocol is for data link layer.

3 .

ICMP is primarily used for _______

A)

routing

B)

forwarding

C)

addressing

D)

error and diagnostic functions

Correct Answer : Option (D) : error and diagnostic functions

Explanation : ICMP abbreviation for Internet Control Message Protocol is used by networking devices to send error messages and operational information indicating a host or router cannot be reached. ICMP operates over the IP packet to provide error reporting functionality as IP by itself cannot report errors.

4 .

The portion of physical layer that interfaces with the media access control sublayer is called _______

A)

physical signalling sublayer

B)

physical data sublayer

C)

physical transport sublayer

D)

physical address sublayer

Correct Answer : Option (A) : physical signalling sublayer

Explanation : The portion of physical layer that interfaces with the medium access control sublayer is Physical Signaling Sublayer. The main function of this layer is character encoding, reception, decoding and performs optional isolation functions. It handles which media connection the signal should be forwarded to physically.

5 .

The physical layer provides ______

A)

specification for IR over optical fiber

B)

electrical specification of transmission line signal level

C)

mechanical specifications of electrical connectors and cables

D)

all of the above

Correct Answer : Option (D) : all of the above

Explanation : Anything dealing with a network cable or the standards in use – including pins, connectors and the electric current used is dealt in the physical layer (Layer 1). Physical layer deals with bit to bit delivery of the data aided by the various transmission mediums.

6 .

Wireless transmission of signals can be done via _____

A)

infrared

B)

radio waves

C)

microwaves

D)

all of the above

Correct Answer : Option (D) : all of the above

Explanation : Wireless transmission is carried out by radio waves, microwaves and IR waves. These waves range from 3 Khz to above 300 Ghz and are more suitable for wireless transmission. Radio waves can penetrate through walls and are used in radio communications, microwaves and infrared (IR) waves cannot penetrate through walls and are used for satellite communications and device communications respectively.

7 .

The physical layer translates logical communication requests from the ______ into hardware specific operations.

A)

network layer

B)

data link layer

C)

trasnport layer

D)

application layer

Correct Answer : Option (B) : data link layer

Explanation : Physical layer accepts data or information from the data link layer and converts it into hardware specific operations so as to transfer the message through physical cables. Some examples of the cables used are optical fiber cables, twisted pair cables and co-axial cables.

8 .

Physical or logical arrangement of network is ______

A)

Routing

B)

Control

C)

Topology

D)

Networking

Correct Answer : Option (C) : Topology

Explanation : Topology in networks is the structure or pattern in which each and every node in the network is connected. There are many topologies in networking like bus, tree, ring, star, mesh, and hybrid topology. There is no particular best topology and a suitable topology can be chosen based on the kind of application of the network .

9 .

Which network topology requires a central controller or hub?

A)

Star

B)

Bus

C)

Ring

D)

Mesh

Correct Answer : Option (A) : Star

Explanation : In star topology, no computer is connected to another computer directly but all the computers are connected to a central hub. Every message sent from a source computer goes through the hub and the hub then forwards the message only to the intended destination computer.

10 .

Data communication system spanning states, countries, or the whole world is _____

A)

LAN

B)

MAN

C)

WAN

D)

PAN

Correct Answer : Option (B) : WAN

Explanation : WAN is the abbreviation for Wide Area Network. This network extends over a large geographical area. WANs are used to connect cities, states or even countries. A wireless connection is required to build a WAN. The best example of WAN is the Internet.