EXERCISE SOLUTION - GOVENRNMENT BOOK COMPUTER SCIENCE 2083
1. Write the full forms
of the following abbreviations:
1. Full Forms
a) DSL – Digital
Subscriber Line
b) bps – Bits Per Second
c) LAN – Local Area Network
d) TCP/IP – Transmission Control Protocol / Internet Protocol
e) IPv6 – Internet Protocol Version 6
f) ISP – Internet Service Provider
g) RFID – Radio Frequency Identification
h) CAT6 – Category 6 Cable
i) NCP – Network Control Protocol
j) DNS – Domain Name System
2. Choose the correct
answer from the given options:
2. Choose the Correct
Answer from the Given Options
i. Which of the following
is a broadband Internet connection?
a) DSL
b) Fiber optic
c) Cable internet
d) All of the above
Answer:
d) All of the above
ii. What is throughput?
a) Theoretical speed of a
network
b) Actual data transferred in a given time
c) Length of a network cable
d) Number of users
Answer:
b) Actual data transferred in a given time
iii. What is a data
packet?
a) A physical network
device
b) A unit of data sent over a network
c) A type of wireless method
d) A security tool
Answer:
b) A unit of data sent over a network
iv. Which of the
following is a type of bounded (guided) media?
a) Fiber optic
b) Infrared
c) Microwave
d) Laser
Answer:
a) Fiber optic
v. Which term refers to
sending data from Earth to a satellite?
a) Downlink
b) Modulate
c) Uplink
d) Download
Answer:
c) Uplink
vi. What is the RJ45
connector mainly used for?
a) USB connections
b) Telephone lines
c) Ethernet networking
d) Fiber optics
Answer:
c) Ethernet networking
vii. What is the
connection pattern of computers in a network called?
a) Protocol
b) Topology
c) Twisted pair
d) Structure
Answer:
b) Topology
viii. Which topology uses
a hub to connect all devices?
a) Ring topology
b) Bus topology
c) Star topology
d) Hybrid topology
Answer:
c) Star topology
ix. What type of network
connects LANs over large areas?
a) PAN
b) MAN
c) WAN
d) CAN
Answer:
c) WAN
x. Which of the following
are Internet services?
a) IRC
b) Telnet
c) Email
d) All of the above
Answer:
d) All of the above
xi. Which protocol is
used to transfer files between computers?
a) FAQ
b) IRC
c) FTP
d) TPF
Answer:
c) FTP
xii. What is the length
of an IPv4 address?
a) 16 bits
b) 32 bits
c) 64 bits
d) 128 bits
Answer:
b) 32 bits
xiii. What does an IP
address identify?
a) A software
b) A network cable
c) A specific device on the network
d) A computer brand
Answer:
c) A specific device on the network
xiv. Which protocol is
commonly used for sending emails?
a) HTTP
b) FTP
c) SMTP
d) DHCP
Answer:
c) SMTP
xv. Which device
strengthens weak network signals for long distances?
a) Switch
b) Router
c) Repeater
d) Bridge
Answer:
c) Repeater
Answer Key
i-d, ii-b, iii-b, iv-a,
v-c, vi-c, vii-b, viii-c, ix-c, x-d, xi-c, xii-b, xiii-c, xiv-c, xv-c 📡💻📚
3. Short Answer Questions
(2 Marks Each)
a) What is broadband? How
is it different from dial-up connections?
Answer:
Broadband is a high-speed Internet connection that provides continuous access
to the Internet. Unlike dial-up connections, broadband is much faster and does
not require a telephone line to be occupied while using the Internet.
b) Define bandwidth. How
is it measured?
Answer:
Bandwidth is the maximum amount of data that can be transmitted through a
network connection in a given period of time. It is usually measured in bits
per second (bps), such as Kbps, Mbps, or Gbps.
c) What is a data packet
in networking?
Answer:
A data packet is a small unit of data transmitted over a network. Large
messages are divided into packets, which travel separately and are reassembled
at the destination.
d) What is frequency in
telecommunications?
Answer:
Frequency is the number of times a signal wave repeats in one second. It is
measured in Hertz (Hz) and determines the transmission characteristics
of communication signals.
e) What is the function
of a repeater?
Answer:
A repeater is a networking device that receives weak signals, amplifies or
regenerates them, and retransmits them. It helps extend the communication
distance of a network.
f) What is a computer
network? How is it useful?
Answer:
A computer network is a collection of interconnected computers and devices that
can communicate and share resources. It is useful for sharing files, printers,
Internet connections, and information efficiently.
g) Why is wireless
communication becoming more popular today?
Answer:
Wireless communication is becoming more popular because it provides mobility,
flexibility, and easy installation without requiring physical cables. It also
allows users to access networks from different locations.
h) Describe the RJ45
connector. Where is it commonly used?
Answer:
RJ45 is an 8-pin connector used with Ethernet cables for wired network
communication. It is commonly used in Local Area Networks (LANs) to connect
computers, switches, routers, and other network devices.
i) What is a media
converter? Mention its main function.
Answer:
A media converter is a networking device that converts one type of transmission
media into another. Its main function is to connect copper-based Ethernet
networks with fiber optic networks.
j) What is the difference
between bandwidth and throughput?
Answer:
Bandwidth is the maximum data transfer capacity of a network, whereas
throughput is the actual amount of data successfully transferred in a given
time. Throughput is usually lower than bandwidth due to network conditions.
k) How does Wi-Fi
transmit data without cables?
Answer:
Wi-Fi transmits data using radio waves between wireless devices and an access
point or router. This enables communication without the need for physical
network cables.
l) How does data travel
from one computer to another in a network?
Answer:
Data is divided into packets and sent through networking devices such as
switches and routers. The packets travel across the network and are reassembled
when they reach the destination computer.
m) How does data flow in
a ring topology?
Answer:
In a ring topology, each device is connected to two neighboring devices,
forming a circular path. Data travels around the ring in one direction until it
reaches the intended destination.
n) Mention one real-life
use of satellite communication.
Answer:
One real-life use of satellite communication is satellite television
broadcasting, where television signals are transmitted from satellites to
viewers over large geographical areas.
o) List two types of
communication media and give one example of each.
Answer:
|
Communication Media |
Example |
|
Guided (Bounded) Media |
Fiber Optic Cable |
|
Unguided (Unbounded)
Media |
Radio Waves |
These media are used to
transmit data between devices in a communication network. 📡💻📚
4. Long Answer Questions
(4 Marks Each)
i. What is communication
media?
Answer:
Communication media refers to the channel or medium through which data and
information are transmitted from one device to another in a network. It acts as
a path for communication between the sender and receiver.
Communication media is
mainly classified into two types:
- Guided (Bounded) Media:
Uses physical cables such as twisted pair cable, coaxial cable, and fiber
optic cable.
- Unguided (Unbounded) Media:
Uses wireless signals such as radio waves, microwaves, and infrared waves.
Communication media plays
a vital role in data transmission and network connectivity.
ii. Differentiate between
LAN and MAN.
|
LAN (Local Area
Network) |
MAN (Metropolitan Area
Network) |
|
Covers a small
geographical area. |
Covers a city or
metropolitan area. |
|
Used within a room,
building, or campus. |
Connects multiple LANs
across a city. |
|
Ownership is usually
private. |
May be owned by
government or service providers. |
|
Less expensive to set
up. |
More expensive to set
up. |
|
Example: School
computer lab. |
Example: City-wide
cable network. |
Conclusion:
LAN is suitable for small areas, whereas MAN is suitable for connecting
networks across a city.
iii. Explain the
differences between client-server and peer-to-peer network architectures.
|
Client-Server Network |
Peer-to-Peer Network |
|
Has a dedicated server. |
No dedicated server. |
|
Centralized management. |
Decentralized
management. |
|
More secure. |
Less secure. |
|
Suitable for large
organizations. |
Suitable for small
networks. |
|
Higher setup cost. |
Lower setup cost. |
Conclusion:
Client-server networks provide better security and management, while
peer-to-peer networks are simple and cost-effective for small environments.
iv. Suppose your school
wants to set up a network in three separate buildings. What type of network
should be used? Justify your answer.
Answer:
A MAN (Metropolitan Area Network) should be used to connect the three
school buildings if they are located within the same city or nearby area.
A MAN can connect
multiple LANs located in different buildings. It enables students, teachers,
and administrators to communicate efficiently and share files and resources
across all buildings. Internet access can also be shared through a central
connection.
Using a MAN reduces
communication costs, improves resource sharing, and ensures smooth network
management throughout the school.
v. Create a network model
for your home that includes three PCs, one printer, and one mobile device
connected to the internet.
Answer:
Network Layout
Internet
|
Router/Wi-Fi
|
Switch
/
| \
PC1 PC2 PC3
|
Printer
Mobile Device
|
Wi-Fi
Description
- A router connects the home
network to the Internet.
- A switch connects the three
PCs and printer using Ethernet cables.
- The mobile device connects
wirelessly through Wi-Fi.
- The router manages Internet access
and communication among all devices.
This design provides
reliable wired connections for PCs and convenient wireless access for mobile
devices.
vi. Which network type
would be more suitable for a small office: client-server or peer-to-peer?
Justify your answer.
Answer:
A client-server network is more suitable for a small office.
It provides centralized
management, better security, and easier backup of important data. Employees can
access shared resources through the server while administrators can control
user permissions.
Although the setup cost
is higher than a peer-to-peer network, it offers better scalability, security,
and management as the office grows.
Therefore, a
client-server network is the preferred choice for a professional office
environment.
vii. Design a simple
layout for a school computer lab network using at least one switch, 10
computers, and internet access.
Answer:
Network Layout
Internet
|
Router
|
Switch
| | | | | | | | | |
PC1 PC2 PC3 PC4 PC5
PC6 PC7 PC8 PC9 PC10
Explanation
- The router connects the lab to
the Internet.
- A switch connects all 10
computers.
- Ethernet cables are used to connect
computers to the switch.
- The switch forwards data only to the
intended device, improving efficiency.
- All computers can share files,
printers, and Internet access through the network.
This design is simple,
cost-effective, and suitable for a school computer laboratory. 📡💻🏫
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