This section contain the short Questions and answers on data communication and networking. this will help reader to directly clear the basic concept of each terminology that is used in data communication and computer network.
Q(1) What do you mean by a computer network?
Ans:- Computer network is an interconnection of autonomous computers connected together using transmission media.
Q(2) What is the need for networking the computers?
1. Sharing of Information,
3. Reduces cost
4. Time saving
Q(3) What is the full form of ARPANET?
Ans:- Advanced Research Projects Agency Network
Q(4) What are various data transmission modes?
Ans:- There are three modes of data transmission
Q(5) What is the difference between Simplex and half duplex transmission?
Ans:- In simples transmission mode, the data can be transferred in only one direction where as in half
duplex transmission mode, the data can be transmitted in both directions but one at a time.
Q(6) What do you mean by MODEM?
Ans:- MODEM stands for MODulatorDEModuator. It is a device that can convert an analog signal into
digital signal and vice versa.
Q(7) Define the terms Bandwidth.
Ans:- Bandwidth is the range of frequencies that is available for the transmission of data. Wider the
bandwidth of a communication channel, the more data it can transmit in a given period of time.
Q(8) What are various types of transmission media?
Ans:- There are two broad categories of transmission media
Q(9) Explain in brief the advantages and disadvantages of Twisted pair Cable.
Often available in existing phone system
Well tested and east to get
Susceptible to noise (sound, energy etc.)
Not as durable as coaxial cable
Does not support high speed
Q(10) What do you mean by communication protocol?
Ans:- A protocol is a set of rules to enable computers to connect with one another and to exchange
information with minimum possible error.
Q(11) List various functions of Communication protocol.
Ans:- Data sequencing, Data Formatting, Flow control, Error Control,Connection Establishment and
Q(12) List commonly used protocols.
Ans:- HTTP, TCT/IP, FTP, SLIP, PPP, SMTP, POP, ICMP
Q(13) What are the main functions of TCP
Ans:- The TCP does the following activities
It breaks the data into packets that the network
Verifies that all the packets arrived at the destination
Reassembles the data
Q(14) What do you mean by network topology?
Ans:- Topology is how the nodes/computers are interconnected together.
Q(15) List various types of Networks.
Ans:- LAN, MAN, WAN
Q(16) Give names of various networking topologies in LAN.
Ans:- 1.Star Topology, 2.Ring topology, 3.Bus topology 4.Mesh Topology
Q(17) Write two advantages and two disadvantages of STAR topology.
Ans:- Advantages of STAR topology
It is easy to modify and add new computers to a star network without disturbing the rest of the
Troubleshooting a star topology network is easy
All the nodes are dependent on the central system. Hub. Failure of hub result in shutting down
of whole of the system
Long cable length is required
Q(18) What is NFS?
Ans:- NFS stands for Network File System. NFS is a protocol that allows a set of computers to access
each others files.
MORE QUESTIONs on Data communication and networking.
Q.1 What is protocol? How many types of protocols are there?
Ans. When computers communicate each other, there needs to be a common set of rules and
instructions that each computer follows. A specific set of communication rules is called a protocol. Some
protocol: PPP, HTTP, SLIP, FTP, TCP/IP
Q.2 What is the difference between Networking and Remote Networking?
Ans. The main difference between Networking and Remote Networking, is the network which we use
in offices or other places locally such LAN or INTERNET and remote networking is one which we use
TERMINAL Services to communicate with the remote users such WAN.
Q.3 What is point-to-point protocol?
Ans. A communication protocol used to connect computer to remote networking services include
Internet Service Providers. In networking, the Point-to-Point protocol is commonly used to establish a
direct connection between two nodes. Its primary use has been to connect computers using a phone line.
Q.4 How gateway is different from router?
Ans. A gateway operates at the upper levels of the OSI model and translates information between two
completely different network architectures. Routers allow different networks to communicate with each
other. They forward packets from one network to another based on network layer information. A gateway
can interpret and translate the different protocols that are used on two distinct networks. Unlike routers
that successfully connect networks with protocols that are similar, a gateway perform an application layer
conversion of information from one protocol stack to another.
Q.5 What is the role of network administrator?
Ans. Basic tasks for which a network administrator may be responsible:
Setting up and configuring network hardware and software.
Installing and configuring network media and connections.
Connecting user nodes and peripherals of all kinds to the network.
Adding users to and removing users from the network.
Managing user account.
Ensuring the security of the network.
Provide training to the users to utilize the network’s resources.
Q.6 What is the difference between baseband and broadband transmission?
Ans. Baseband is a bi-directional transmission while broadband is a unidirectional transmission.
No Frequency division multiplexing possible in base band but possible in broadband.
Q.7 What are the difference between domain and workgroup?
Q.8 What is the differences between POP3 and IMAP Mail Server?
Ans. IMAP is a standard protocol for accessing e-mail from a local server. A simpler e-mail protocol is
Post Office Protocol 3 (POP3), which download mail to the computer and does not maintain the mail on
the server. IMAP, e-mails are stored on the server, while in POP3, the messages are transferred to the
client’s computer when they are read.
Q.9 Name different layer of the ISO OSI Model.
Ans. International Standard Organisation – Open Systems Interconnection has seven layers;
Physical Layer,Data Link Layer,Network Layer,Transport Layer,Session Layer,Presentation Layer
Q.10 What is client server architecture?
Ans. To designated a particular node which is well known and fixed address, to provide a service to the
network as a whole. The node providing the service is known as the server and the nodes that use that
services are called clients of that server. This type of network is called Client-Server Architecture.
Q.11 What is FDM? Give example.
Ans. FDM-Frequency Division Multiplexing is used in analog transmission. It is often used in short
distance. It is code transparent and any terminal of the same speed can use the same sub-channel after the
sub-channel is established. The best example if FDM is the way we receive various stations in a radio.
Q.12 Describe the following in brief:
i) MOSAIC ii) USENET iii) WAIS
Ans. i) MOSAIC: is the program for cruising the internet. The National centre wrote this program for
Super Computer application at the university of Illinois. It has a simple window interface, which creates
useful hypertext links that automatically perform some of the menu bar and button functions.
ii) USENET: is the way to meet people and share information. Usenet newsgroup is a special group set up
by people who want to share common interests ranging from current topic to cultural heritages.
iii) WAIS: is a WIDE AREA INFORMATION SERVER.