CBSE/Karnataka PU Board PUC II CHAPTER 10 : COMPUTER NETWORKS

50 MCQ QUESTIONS WITH ANSWERS

A group of interrelated computers sharing resources is called:
a) LAN
b) Network
c) MAN
d) Server
Answer: b
A modem is used for:
a) Storage
b) Data entry
c) Conversion of signals
d) Display
Answer: c
Which of these is not a networking device?
a) Switch
b) Router
c) Mouse
d) Modem
Answer: c
Which network covers the largest area?
a) PAN
b) LAN
c) WAN
d) MAN
Answer: c
In a ring topology, data travels in:
a) Both directions
b) Single direction
c) Zig-zag
d) Random
Answer: b
Ethernet is associated with:
a) Data Storage
b) Network Connections
c) Programming
d) Encryption
Answer: b
Full form of NIC is:
a) Network Internet Card
b) Net Internal Card
c) Network Interface Card
d) None
Answer: c
Which device amplifies weak signals?
a) Hub
b) Switch
c) Repeater
d) Modem
Answer: c
Wi-Fi is an example of:
a) Wired network
b) Wireless network
c) Satellite
d) Radio
Answer: b
Which is not a topology?
a) Mesh
b) Tree
c) Root
d) Star
Answer: c
Every NIC has a unique:
a) IP address
b) MAC address
c) Router
d) Cable
Answer: b
Bluetooth is used in:
a) PAN
b) LAN
c) WAN
d) MAN
Answer: a
Which network has the highest data transfer rate?
a) WAN
b) MAN
c) LAN
d) PAN
Answer: c
The World Wide Web was invented by:
a) Bill Gates
b) Tim Berners-Lee
c) Charles Babbage
d) Steve Jobs
Answer: b
DNS translates:
a) Names to numbers
b) IP to MAC
c) MAC to IP
d) Address to port
Answer: a
Star topology uses a central:
a) Node
b) Cable
c) User
d) Server
Answer: a
Bus topology shares a single:
a) Switch
b) Backbone cable
c) Server
d) Modem
Answer: b
Which device connects different networks?
a) Hub
b) Router
c) Repeater
d) Switch
Answer: b
IPV4 address has:
a) 8 bits
b) 16 bits
c) 32 bits
d) 64 bits
Answer: c
The physical address is also called:
a) Logical address
b) Port address
c) MAC address
d) Node address
Answer: c
To access bank servers in two different cities, we use:
a) LAN
b) WAN
c) MAN
d) PAN
Answer: b
A switch can transmit signals to:
a) All nodes
b) One selected node
c) Only central node
d) None
Answer: b
A Wi-Fi router can provide:
a) Only wired network
b) Only wireless
c) Both wired and wireless
d) None
Answer: c
A tree topology is a combination of:
a) Star and bus
b) Ring and mesh
c) Bus and mesh
d) None
Answer: a
The main function of a modem is:
a) Data storage
b) Modulation and demodulation
c) Routing
d) Switching
Answer: b
Each device in a network is called a:
a) Node
b) Cable
c) Link
d) Path
Answer: a
The unique address assigned to each node for communication is:
a) MAC address
b) DNS
c) URL
d) Port
Answer: a
The central device in star topology can be:
a) Switch
b) Hub
c) Both a and b
d) None
Answer: c
Network devices can be connected through:
a) Only cables
b) Only wireless
c) Both
d) Neither
Answer: c
What is the default gateway in a home network?
a) Modem
b) ISP
c) Router
d) Switch
Answer: c
The internet is an example of:
a) PAN
b) LAN
c) WAN
d) MAN
Answer: c
Device to forward packets to specific addresses:
a) Hub
b) Switch
c) Repeater
d) Router
Answer: b
A hybrid topology can have branches of:
a) Mesh
b) Star
c) Bus
d) All of these
Answer: d
MAC address is:
a) Temporary
b) Permanent
c) Changeable
d) None
Answer: b
Transmission of data in small units over networks is called:
a) Messaging
b) Routing
c) Packet Switching
d) Framing
Answer: c
A wireless network connects via:
a) Cables
b) Air
c) Fiber
d) Copper
Answer: b
A firewall is generally attached to the:
a) Hub
b) Switch
c) Gateway
d) NIC
Answer: c
A device that regenerates a data signal:
a) Hub
b) Repeater
c) Router
d) Gateway
Answer: b
The main function of DNS is:
a) Data encryption
b) IP address allocation
c) Name resolution
d) Packet switching
Answer: c
A bus topology is:
a) Cheap and simple
b) Expensive
c) Complex
d) None
Answer: a
HTML is used to:
a) Program routers
b) Design web pages
c) Encrypt data
d) Assign IP addresses
Answer: b
A LAN typically covers:
a) Very wide area
b) Small area
c) Country
d) Continent
Answer: b
The fastest network is:
a) LAN
b) MAN
c) WAN
d) PAN
Answer: a
Data is sent in a ring topology in:
a) Both directions
b) One direction
c) Random manner
d) None
Answer: b
Examples of local networking devices include:
a) Modem
b) Hub
c) Switch
d) All of these
Answer: d
Each device in a LAN has a:
a) Port address
b) MAC address
c) Both
d) IP address
Answer: b
A hybrid topology combines features of:
a) Two topologies
b) Three topologies
c) Any number of topologies
d) Only mesh
Answer: c
Star topology is dependent on:
a) The central node
b) Each individual node
c) Peripheral connection
d) None
Answer: a
In a network, a host can be:
a) Printer
b) Computer
c) Mobile
d) All of these
Answer: d
The Internet backbone is formed by:
a) Home routers
b) Regional networks
c) National networks
d) Both b and c
Answer: d

1 MARK QUESTIONS (20) WITH ANSWERS

What is a network?
Answer: A network is an interconnection of two or more computers to share data and resources.
State one example of a networking device.
Answer: Switch
What does WAN stand for?
Answer: Wide Area Network
Name a personal area network technology.
Answer: Bluetooth
What is the physical address of a NIC called?
Answer: MAC address
Expand the term LAN.
Answer: Local Area Network
Name one wired networking medium.
Answer: Ethernet cable
Write one function of a router.
Answer: Connects different networks
What is the function of a modem?
Answer: Converts digital to analog signals and vice versa
What is topology?
Answer: The arrangement of computers and peripherals in a network
What does DNS stand for?
Answer: Domain Name System
Who invented the WWW?
Answer: Tim Berners-Lee
State one use of a hub.
Answer: Connects multiple devices in a LAN
What is a node?
Answer: Any device connected to a network
Name a wireless networking standard.
Answer: Wi-Fi
What is a hybrid topology?
Answer: Combination of two or more network topologies
Name a device that strengthens a weak signal.
Answer: Repeater
What is the main purpose of the Internet?
Answer: To connect and share information globally
What does ARPANET stand for?
Answer: Advanced Research Projects Agency Network
What is packet switching?
Answer: Data transmission method where data is sent in packets

2 MARK QUESTIONS (20) WITH ANSWERS

Differentiate between LAN and WAN.
Answer: LAN covers a small area such as a room or building, while WAN covers large geographical areas such as cities or countries.
What are the two main functions of a modem?
Answer: Modulates digital signals to analog for transmission and demodulates analog signals to digital for receipt.
What is the use of NIC?
Answer: It enables a computer to connect to a network.
Name two topologies and briefly describe them.
Answer:
- Star topology: All nodes connect to a central device
- Bus topology: All nodes connect to a single backbone cable.
State two differences between hub and switch.
Answer: Hub transmits data to all devices; switch sends only to intended recipient. Switch is more efficient.
What is the role of a gateway?
Answer: Connects different networks and manages traffic between them.
Mention any two advantages of using a network.
Answer: Resource sharing and data sharing.
State two disadvantages of bus topology.
Answer: Difficult to troubleshoot, not secure.
Write any two types of network cables.
Answer: Ethernet cable, fibre optic cable.
What is a MAC address?
Answer: A unique hardware address assigned to NIC.
What is the difference between IPV4 and IPV6?
Answer: IPV4 has 32 bits, while IPV6 has 128 bits for addressing devices.
Mention any two features of a LAN.
Answer: High speed, limited geography.
What do you mean by packet switching?
Answer: Data is broken into packets and sent independently to destination.
Differentiate between server and client.
Answer: Server provides services, client uses services in a network.
What is the primary purpose of a DNS server?
Answer: Translates domain names to IP addresses.
Write two uses of the Internet.
Answer: Email, web browsing.
What is the main difference between repeater and hub?
Answer: Repeater regenerates weak signals; hub connects multiple devices.
Define World Wide Web.
Answer: Interlinked collection of web pages accessible over the Internet.
What is meant by a logical address?
Answer: The IP address assigned to a device in a network.
State two uses of an Ethernet card.
Answer: Connecting computer to wired LAN and assigning a MAC address.

3 MARK QUESTIONS (20) WITH ANSWERS

Explain the working of a modem.
Answer: The modem converts digital data from the computer into analog signals for transmission over telephone lines and vice versa, enabling communication across networks.
Compare mesh and ring topologies.
Answer: Mesh connects every device to every other; it’s reliable but expensive and complex. Ring connects each device to two others in a closed loop; data travels in one direction, is less expensive, but has single point failure.
Discuss the evolution of networking from ARPANET to Internet.
Answer: ARPANET started as a research network, connecting universities for collaboration. Over time, it expanded, integrated other networks, introduced protocols like TCP/IP, and evolved to become the basis for today’s Internet.
What is a computer network? Discuss its types with examples.
Answer: A computer network interconnects computers for communication and resource sharing. Types: LAN (school lab), MAN (city cable network), and WAN (Internet).
Explain the purpose and components of a LAN.
Answer: LAN provides high-speed networking in a limited area (such as an office). Components include switch/hub, cables, NICs, and devices like computers and printers.
What is MAC address? How is it different from IP address?
Answer: MAC address is a hardware address, permanent for each NIC. IP address is logical, assigned by network, can change.
Describe bus, star, and ring topologies with diagrams.
Answer: (Diagram required for actual exam)
- Bus connects all nodes to a single cable.
- Star connects nodes to a central device.
- Ring connects nodes in a closed circle.
Explain the purpose of repeaters and switches in a network.
Answer: Repeater strengthens signals in a network to extend distance. Switch connects devices, forwarding data to specific devices, enhancing efficiency.
Define packet switching and its advantages.
Answer: Packet switching divides data into packets sent independently, providing efficient, robust, and reliable communication.
What is a DNS server? Why is it important?
Answer: A DNS server maps human-friendly names to IP addresses, making Internet browsing user-friendly and manageable.
Discuss the structure and working of the World Wide Web.
Answer: WWW comprises interlinked web pages, identified by URLs, using HTTP/HTTPS for access. It’s built on the Internet and invented by Tim Berners-Lee.
How do LAN and MAN differ?
Answer: LAN covers small area (office), high speed. MAN is for city-wide networks, lower speed than LAN but larger coverage.
Explain the functions of a switch in networking.
Answer: Switch directs incoming data to specific devices using MAC addresses, reducing collisions and improving performance.
Compare wired and wireless networks.
Answer: Wired networks use cables, stable and fast. Wireless use air, more flexible but can suffer interference and lower speeds.
What is hybrid topology? Give an example.
Answer: Hybrid topology combines two or more topologies, e.g., a star-bus network.
State three uses of a router.
Answer: Connects devices to the Internet, divides network segments, provides NAT (Network Address Translation).
Illustrate with examples the difference between server and client in a network.
Answer: Server – files stored centrally (file server); client accesses these files (student PC).
Explain the role of an Internet Service Provider (ISP).
Answer: ISP provides access to the Internet, assigns IP addresses to users, and manages connections and service plans.
Describe the process of domain name resolution.
Answer: Browser sends the domain name to DNS server, gets corresponding IP address, then accesses the website.
Discuss any three advantages of computer networking.
Answer: Easier communication, resource sharing, centralized data management.

5 MARK QUESTIONS (20) WITH DETAILED ANSWERS

1. Define network topology. Describe five popular topologies and their advantages/disadvantages.
Network topology is the arrangement of computers and devices within a network.

Mesh: Each device connects to every other device; reliable and robust, but costly and complex.
Bus: All devices share a single communication line; inexpensive but prone to collisions.
Star: Devices connect to a central hub; easy to manage, but failure of hub breaks the network.
Ring: Each device connects to two others in a circle; simple but a break disables the network.
Tree/Hybrid: Hierarchical arrangement; scalable and flexible, but complex to design.

2. Explain LAN, MAN, WAN with diagrams and give their distinguishing features.
A LAN covers a small area like an office; high speed, secure. MAN spans a city or town, medium speed, costly, used by ISPs and institutes. WAN covers large areas, such as countries; slowest, expensive, includes Internet. For each, topology diagrams illustrate device connections and coverage.

3. Discuss the differences among networking devices: Hub, Switch, Repeater, Router, and Gateway.
Hub transmits data to all ports, causes collisions. Switch transmits data only to intended port, reduces collisions, increases performance. Repeater regenerates weakened signals, extending range. Router connects different networks and directs data using IP addresses. Gateway connects networks with different protocols and translations, acts as entry/exit to a network.

4. How does data travel from one computer to another over a network?
Data is split into packets, assigned headers containing IP/MAC addresses. Packets travel through network devices (hubs, switches, routers). If destination is outside LAN, packets reach router, possibly travel the Internet. At target, packets are reassembled and delivered to destination application.

5. Describe the functions of a modem and Ethernet card in computer networking.
A modem modulates digital signals for analog transmission over phone lines and demodulates incoming signals back to digital. It enables computers to communicate over long distances via ISPs. An Ethernet card (NIC) allows a computer to physically connect to a network using cables, providing each computer with a unique MAC address for identification and communication.

6. Explain IP addressing and MAC addressing. How do they differ and why are both necessary?
IP address is logical, assigned by the network, and can change, allowing communication over Internet. MAC address is hardware-based, permanent. IP addresses help in routing data, MAC addresses are used for delivery within local networks. Both are essential for identifying and delivering data at different network layers.

7. What is the World Wide Web? Who invented it and what technologies made it possible?
WWW is a vast collection of interlinked web pages and resources accessible over the Internet. Invented by Tim Berners-Lee, technologies like HTML (for structure), URI/URL (unique addresses), and HTTP (protocol for data transfer) made it possible.

8. Describe the role and structure of Domain Name System (DNS).
DNS translates domain names to IP addresses, making browsing user-friendly. Hierarchically structured, top-level root servers delegate queries to authoritative servers, then to local servers, resolving domain names stepwise until the target IP is found.

9. Give a detailed comparison of different network topologies with diagrams.
Compare mesh, star, ring, bus, tree:

Security, cost, scalability, failure points, speed
Mesh: robust, high cost
Star: simple, hub failure risk
Ring: reliable, break disrupts network
Bus: cheap, performance drops as devices add
Tree: scalable, complex

10. What is packet switching? Explain its benefits and operation in computer networks.
Packet switching divides data into packets, each packet travels independently across network, reassembled at destination. Increases efficiency, optimizes bandwidth, and enables robust error management.

11. Explain the difference between the Internet and the World Wide Web.
The Internet is the global network of connected computers. The WWW is a service on the Internet using web pages and browsers, built with protocols like HTTP, made accessible by technologies like DNS.

12. Discuss in detail about computer network devices and their functions.

Hub: Broadcasts data
Switch: Forwards to specific location
Router: Connects networks
Repeater: Signal booster
Gateway: Protocol converter
NIC: Provides connection and MAC

13. How is security implemented in a computer network?
Through firewalls, antivirus, network encryption, access controls, and proper configuration of devices like gateways and routers, as well as secure protocols.

14. What is network troubleshooting? Describe three tools/methods with examples.
Finding and resolving network issues; tools include ping (connectivity check), traceroute (route analysis), and network analyzers for diagnosing traffic and faults.

15. Explain the process of connecting to the Internet from a personal computer.
User’s PC uses NIC for physical connection, modem to access ISP, router assigns IP, DNS resolves addresses, browser accesses web via HTTP, data sent and received in packets.

16. Describe IPv4 and IPv6 addressing with examples. Why is IPv6 needed?
IPv4: 32-bit, e.g., 192.168.1.1; only ~4 billion addresses. IPv6: 128-bit, e.g., 2001:0db8:85a3::8a2e:0370:7334; huge address pool for growing devices.

17. What is the function and importance of an Internet Service Provider (ISP)?
ISPs offer Internet connectivity, assign IP addresses, offer access to web resources, and manage network traffic for users.

18. How do repeaters and switches work together in a large LAN?
Repeaters boost signal across longer distances, switches direct traffic within large segments, ensuring data reaches correct destination efficiently and over extended area.

19. Explain the significance of domain names and how DNS makes Internet browsing easier.
Domain names are human-readable addresses; DNS translates them to machine-readable IPs, simplifying browsing and information access.

20. How can computer networks be classified and on what basis?
By size (PAN, LAN, MAN, WAN), topology (bus, star, mesh, etc.), or function (client-server, peer-to-peer).

Habbit2Code

Search This Blog