Computer network Class 12 Computer Science Exam Questions

Please refer to Computer Science For Computer network Class 12 Computer Science Exam Questions provided below. These questions and answers for Class 12 Computer Science have been designed based on the past trend of questions and important topics in your class 12 Computer Science books. You should go through all Class 12 Computer Science Important Questions provided by our teachers which will help you to get more marks in upcoming exams.

Class 12 Computer Science Exam Questions Computer network

Question. Uploading photo from mobile phone to Desktop computer is an example of _______
(a) LAN
(b) PAN
(c) MAN
(d) WAN

Question. In a _________ topology, a dedicated link connects a device to a central controller.
(a) Ring,
(b) Bus
(c) Mesh
(d) Star

Question. Rearrange the following types of network PAN, MAN, LAN, WAN in descending order of their area coverage. 
(a) WAN
(b) MAN
(c) LAN
(d) PAN
(e) All of these

Question. Physical or logical arrangement of network is __________
(a) Topology
(b) Routing
(c) Networking
(d) None of the mentioned

Question. In a _________ topology, a device (non-central controller) needs only one input / output port
(a) Ring
(b) Bus
(c) Mesh
(d) Star

Question. A term that refers to the way in which the nodes of a network are linked together
(a) Network,
(b) Topology,
(c) Connection,
(d) Interconnectivity

Question. Which is used in LAN
(a) Wi-fi
(b) Wi-Max) 1

Question. Internet is an example of most common type of ____ network.
(a) LAN
(b) PAN
(c) MAN
(d) WAN

Question. A ______ Topology is a variation of a Star topology.
(a) Ring
(b) Bus
(c) Mesh
(d) Tree

Question. The multipoint topology is
(a) Bus
(b) Star
(c) Mesh
(d) Ring 

Question. Which of the following is not a network topology : 
(a) Star
(b) Mesh
(c) Tree,
(d) Bug
(e) Bus

Question. The bus, ring and star topologies are mostly used in the
(a) LAN,
(b) MAN,
(c) WAN,
(d) Internetwork

Question. In which topology there is a central controller or hub?
(a) Star
(b) Mesh
(c) Ring
(d) Bus

Question. What is the possible maximum area covered by LAN
(a) 100-500 meter,
(b) 1-5 KM,
(c) 1-10 KM,
(d) 1-2 KM

Question. The combination of two or more topologies are called
(a) Star Topology,
(b) Bus Topology,
(c) Ring Topology,
(d) Hybrid

Question. The participating computers in a network are referred to as:
(a) Clients
(b) Servers
(c) Nodes
(d) CPUs

Question. The network designed for customers who need a high speed connectivity is _____
(a) LAN
(b) MAN
(c) WAN
(d) PAN

Question. A ____________WAN can be developed using leased private lines or any other transmission facility
(a) Hybrids
(b) peer-to-peer
(c) Two-tiered
(d) Three-tiered

Question. A bus topology has a ________ line configuration.
(a) Point – to – Point
(b) Multipoint
(c) passive
(d) None of the Above

Question. Bus, ring and star topologies are mostly used in the
(a) LAN
(b) MAN
(c) WAN
(d) Internetwork

Question. Data Communication systems spanning states, countries or the whole world is ______
(a) PAN
(b) LAN
(c) WAN
(d) MAN

Question. Which type of Network is generally privately owned and links the devices in a single office building or Campus?
(a) LAN
(b) PAN
(c) MAN
(d) WAN

Question. In mesh topology, the devices are connected via.
(a) Multipoint link
(b) Point to point link
(c) No Link
(d) None of the above.

Question. A topology that involves Tokens.
(a) Star
(b) Ring
(c) Bus
(d) Daisy Chaining

Question. In a _______topology, a secondary hub can connect to a central hub.
(a) Ring
(b) Bus
(c) Mesh
(d) Tree

Question. Data communication system within a building or campus is________
(a) LAN
(b) WAN
(c) MAN
(d) None of the mentioned

Very Short Answer Type Questions :

Question. What do you mean by internet?
Answer: Network of networks is called internet.
Or
The internet is the world-wide network of computer networks.

Question. Set of rules and regulations used while communication/transmission is ______
a. Topology
b. Gateway
c. Protocol
d. Bandwidth
Answer: Protocol

Question. Expand the following terms:
Answer: i. HTTP – Hyper Text Transfer Protocol
ii. FTP – File Transfer Protocol
iii. TCP/IP – Transmission Communication Protocol/Internet Protocol
iv. SLIP – Serial Line Internet Protocol
v. PPP – Point to Point Protocol
vi. IMAP – Internet Message Access Protocol
vii. POP3 – Post of Protocol 3
viii. SMTP – Simple Mail Transfer Protocol
ix. IRC – Internet Relay Chat
x. SIP – Session Initiation Protocol
xi. VoIP – Voice over Internet Protocol

Question. Name the protocols used in Email.
Answer: i. IMAP – Internet Message Access Protocol
ii. POP3 – Post of Protocol 3
iii. SMTP – Simple Mail Transfer Protocol
iv. HTTP – Hyper Text Transfer Protocol

Question. Name the protocol that is used to transfer files from one system to another.
Answer: FTP – File Transfer Protocol

Question. Which one is chat protocola.
a. HTTP
b. IRC
c. SMTP
d. VoIP
Answer: IRC

Question. Write a short note on VoIP.
Answer: VoIP is technology that enables voice communication over the internet through the compression of voice in data packets and vice versa, that can be transmitted over data networks.

Question. What is name of first computer network?
a. Internet
b. NIC
c. ARPANET
d. NSFNET
Answer: ARPANET

Question. Write the full form of ARPANET.
Answer: American Research Project Agency Network

Question. What do you mean by computer network?
Answer: A computer network is a collection of interconnected autonomous computing devices so as to exchange information or share resources.

Question: Expand the following
(i) VoIP
Answer: Voice over Internet Protocol
(ii) SMTP
Answer: Simple Mail Transfer Protocol
(iii) CSMA
Answer: Carrier sense Multiple Access
(iv) TCP/IP
Answer: Transmission Control Protocol/Internet Protocol

Question: The following is a 32-bit binary number usually represented as 4 decimal values, each representing 8 bits, in the range 0 to
255(known as octets) separated by decimal points.
140.179.220.200
What is it? What is its importance?
Answer: It is an IP Address.It is used to identify the computers on a network.

Question. Which of the following is a fastest transmission media –
• Ethernet Cable
• Fiber optics Cable
• Coaxial Cable
Answer: Fiber optics Cable

Question. Write the expanded names for the following abbreviated terms used in
Networking and Communications:
(i) MBPS (ii) WAN (iii) CDMA (iv) WLL
Answer: (i) MBPS – Mega Bytes per Second OR Mega Bits per second
(ii) WAN – Wide Area Network
(iii) CDMA – Code Division Multiple Access
(iv) WLL – Wireless in Local Loop

Question. What is a computer Network? 
Answer: Collection of two or more devices connected to each other to share resources.

Question. What is NIC? Give other name of NIC. 
Answer: Stands for Network Interface Card. It is used to connect a computer to a network.
Also known as Network Adapter of Ethernet Card.

Question. Give two differences between 3G and 4G telecommunication technologies. 
Answer: ● Higher download/upload speeds in 4G compared to 3G
● Greater bandwidth and flexibility in 4G compared to 3G
● 3G is Voice + Data whereas 4G is only Data with voice overriding

Question. Which is the fastest network from the following?
• LAN (Local Area Network)
• WAN (Wide Area Network)
• MAN (Metropolitan Area Network)
Answer: LAN (Local Area Network)

Question. The switching technique that splits a message into smaller pieces is known as ________________?
Answer: Packet Switching

Question. The switching technique that establishes a dedicated path between sender and receiver is known as _________________?
Answer: Circuit Switching

Question. Identify the Network that is limited to the proximity of an individual and covers a range from 10 to 20 meters.
• LAN (Local Area Network)
• WAN (Wide Area Network)
• PAN (Personal Area Network)
• MAN (Metropolitan Area Network)
Answer: PAN (Personal Area Network)

Question. TCP/IP stands for –
a) Transmission Communication Protocol / Internet Protocol
b) Transmission Control Protocol / Internet Protocol
c) Transport Control Protocol / Interwork Protocol
d) Transport Control Protocol / Internet Protocol
Answer: Transmission Control Protocol / Internet Protocol

Question: Name the network tools used in the given situations:
a. To troubleshoot internet connection problems
Answer: ping
b. To see the IP address associated with a domain name
Answer: nslookup
c. To lookup registration record associated with a domain name.
Answer: whois
d. To test the speed of internet connection
Answer: speedtest.net

Question: Which protocol is used to search information from internet using browser?
Answer: HTTP (Hyper Text Transfer Protocol

Question: When you move the NIC cards from one PC to another PC, does the MAC address gets transferred as well?
Answer: Yes, that’s because MAC addresses are hard-wired into the NIC circuitry, not the PC. This also means that a PC can have a different MAC address when the NIC card was replace by another one.

Question: Which protocol helps us to transfer files to and from a remote computer?
Answer: FTP (File transfer protocol)

Question: Assume that 8 bit checksum is used for error detection. The data to be transmitted is given below.
10011001111000100010010010000100. Calculate the checksum value?
Answer: Step 1: Add all segments and find the sum
10011001 + 11100010=101111011 [1 extra bit, so add to the result]
01111011+1=01111100
01111100+00100100=10100000 [No extra bit]
10100000+10000100=100100100 [1 extra bit, so add to the result]
00100100+1=00100101
Step 2: find the complement of sum: 11011010
Checksum value =11011010

Question: What is MAC address? How it differ from IP address? Give example?
Answer: A MAC address is the unique identifier that is assigned by the manufacturer to a piece of network hardware. It is a unique address used to identify a device on the internet.
Eg: MAC address: 00:1B:f4:11: fA: B7
IP address: 216.27.61.137

Question: Identify the protocol, domain name and path from the given URL https://www.w3schools.com/html/default.asp. What is the name of the process to obtaining corresponding IP address from the domain name?
Answer: Protocol: https
Domain name: www.w3schools.com
Path: html/default.asp
The process to obtaining corresponding IP address from the domain name is domain name resolution.

Question: Suppose you want to perform any financial transaction through the internet. How can you check if the connection is secure or not?
Answer: Before entering any financial information, first make sure that URL starts with HTTPS and then check the padlock sign on the navigator bar. If both are there, then the connection is secure.

Question: The wireless networks employ strategies to avoid collision. Why can’t they detect collisions?
Answer: Collisions occur when multiple transmissions takes place at the same over a network. Wireless networks are half duplex in nature that is they cannot listen while transmitting. Hence they cannot find out if any other transmission is taking place simultaneously, and thus cannot detect collision.

Short Answer Type Questions :

Question: Write the expanded names for the following abbreviated terms used in Networking and Communications :
i. SMTP
ii. VoIP
iii. GSM
iv. WLL
Answer: i. Simple Mail Transfer Protocol ii. Voice over Internet Protocol iii. Global System for Mobile Communication iv. Wireless Local Loop

Question: Differentiate between communication using Optical Fiber and Ethernet Cable in context of wired medium of communication technologies.
Answer:
Optical Fibre – Very Fast – Expensive – Immune to electromagnetic interference Ethernet Cable – – Slower as compared to
Optical Fiber – Less Expensive as compared to Optical Fiber – prone to electromagnetic interference

Question: Identify odd one out of the following:
Optical Fiber/Coaxial Cable/ Bluetooth/Twisted Pair Cable. Give reason for your answer.
Answer: Odd one: Bluetooth
Reason: Bluetooth is a wireless/unguided communication media while others are wired/guided communication media.

Question: ABC Company wants to link its computers in Head office in New Delhi to its office in Sydney. Name the type of Network that will be formed. Which communication media should be used to form this Network?
Answer: Type of network that will be formed: Wide Area Network (WAN)
Transmission media to be used: Satellite

Question: How is it easier to diagnose fault in Star topology than in Bus topology?
Answer: In Star topology each node is directly connected to a central hub / switch, hence fault diagnosis becomes easy. In bus topology all the nodes are connected to the backbone cable. The signal travels through the entire length of the backbone and is received by the node for which it is intended. Hence, fault diagnosis is difficult.

Question: Which of the following are valid IP addresses? Give reason(s) if invalid.
i) 121.23.1.45
ii) 192.168.0. 254
iii) 192.168.0.1
iv) 198.-1.1.1
Answer: Valid IP addresses: (i), (ii), (iii) Invalid IP address: (iv) 198.-1.1.1 because an IP address is a group of four bytes; each of which can be a number from 0 to 255.

Question: Which of the following is/are not communication media?
a. Microwaves b. Optical Fiber cable c. Node d. Radio waves
b. Identify which of the above mentioned communication media are wired media and which ones are Wireless media.
Ans. Not communication media: Node
Wired media: Optical Fiber cable
Wireless media: Microwaves, Radio waves

Question: Name the devices:
This device connects multiple nodes to form a network. It redirects the received information only to the intended node(s).
Answer: Switch

Case study based questions :

Ayurveda Training Educational Institute is setting up its centre in Hyderabad with four specialised departments for Orthopedics, Neurology and Pediatrics along with an administrative office in separate buildings. The physical distances between these department buildings and the number of computers to be installed in these departments and administrative office are given as follows. You, as a network expert, have to answer the queries as raised by them in (i) to (iv).

Shortest distances between various locations in metres :

Number of Computers installed at various locations are as follows :

Question: Suggest the devices to be installed in each of these buildings for connecting computers installed within the building out of the following : Gateway, switch, Modem
Answer: Switch

Question: Suggest the topology of the network and network cable for efficiently connecting each computer installed in each of the buildings out of the following :
Topologies: Bus Topology, Star Topology
Network Cable: Single Pair Telephone Cable, Coaxial Cable, Ethernet Cable.
Answer: Topology: Star Topology
Network Cable: Ethernet Cable / Coaxial Cable

Question: Suggest the most suitable location to install the main server of this institution to get efficient connectivity.
Ans. Administrative Office

Question: Suggest the best cable layout for effective network connectivity of the building having server with all the other buildings.
Answer: Administrative Office is connected to Orthopedic, Radiology, Pediatrics units directly in a Star Topology

Intelligent Hub India is a knowledge community aimed to uplift the standard of skills and knowledge in the society. It is planning to setup its training centers in multiple towns and villages pan India with its head offices in the nearest cities. They have created a model of their network with a city, a town and 3 villages as follows. As a network consultant, you have to suggest the best network related solutions for their issues/problems raised in (i) to (iv), keeping in mind the distances between various locations and other given parameters.

Shortest distances between various locations:

Number of Computers installed at various locations are as follows:

In Villages, there are community centers, in which one room has been given as training center to this organization to install
computers. The organization has got financial support from the government and top IT companies.

Question: Which hardware device will you suggest to connect all the computers within each location of YHUB?
Answer: Switch OR Hub

Question: Which service/protocol will be most helpful to conduct live interactions of Experts from Head Office and people at YHUB locations?
Answer: Videoconferencing OR VoIP

Question: Suggest the most appropriate location of the SERVER in the YHUB (out of the 4 locations), to get the best and effective connectivity. Justify your answer.
Answer: YTOWN. Because it has the maximum number of computers and it is closest to all other locations.

Question: Suggest the best wired medium and draw the cable layout (location to location) to efficiently connect various locations within the YHUB.
Answer: Optical fiber