Computer Network and Communication

Computer Network and Communication - 10 (Book Exercise)

Exercise Solutions

1. Write the Full Forms of the Following

S.N.	Abbreviation	Full Form
i.	ARPANET	Advanced Research Projects Agency Network
ii.	STP	Shielded Twisted Pair
iii.	NIC	Network Interface Card
iv.	PAN	Personal Area Network
v.	WAN	Wide Area Network
vi.	MAN	Metropolitan Area Network
vii.	TCP/IP	Transmission Control Protocol / Internet Protocol
viii.	SMTP	Simple Mail Transfer Protocol
ix.	FTP	File Transfer Protocol

2. Select the Correct Answer from the Given Alternatives

What does the term bandwidth refer to in networking?
Answer: The data transfer rate of a channel.

Which generation of mobile networks introduced high-speed internet and video calling?
Answer: 3G

How do data packets function in network communication?
Answer: They carry data across a network in small chunks.

Why is throughput important in networking?
Answer: It measures actual data delivery speed.

What type of cable is CAT6?
Answer: Twisted Pair for Ethernet.

Which medium is used for long-distance, high-speed data transmission?
Answer: Optical Fiber.

How does Wi-Fi transmit data?
Answer: Using radio waves.

Why is RFID used in wireless communication?
Answer: For tagging and tracking objects.

Which connector is commonly used in Ethernet cables?
Answer: RJ45

What is the function of a media converter?
Answer: Change data format from one media type to another.

How does a repeater work in a network?
Answer: Boosts weak signals.

Which device selects the best and shortest path in a network?
Answer: Router

Why is a router important in a network?
Answer: It forwards data between networks.

What topology connects all computers to a single cable?
Answer: Bus Topology.

Which topology is most fault-tolerant?
Answer: Star Topology.

How is a PAN different from a LAN?
Answer: PAN connects personal devices in a small area.

What kind of network covers a large geographical area?
Answer: WAN

Which architecture includes a central server and client computers?
Answer: Client-Server

Why is peer-to-peer networking suitable for small businesses?
Answer: Cheaper and easy to maintain.

What is the length of an IPv4 address?
Answer: 32-bit

How does IPv6 solve the limitations of IPv4?
Answer: Provides more IP addresses.

Which network is used only within an organization?
Answer: Intranet

What is the main difference between the Internet and Intranet?
Answer: The Intranet is private and for internal use.

How does an Extranet differ from an Intranet?
Answer: Extranet allows limited external access.

3. Write Short Answer Questions for the Following

What is telecommunication, and why is it important in today's world?
Answer:

Telecommunication is the exchange of information over long distances using electronic devices and communication media such as telephone lines, radio waves, optical fiber and satellites.

Importance:
- Enables fast communication across the world.
- Supports education, business, healthcare and online services.

How does broadband differ from a traditional dial-up connection?

Answer:

Broadband	Dial-up
Provides high-speed Internet access.	Provides low-speed Internet access.
Always connected.	Requires dialing each time.
Allows simultaneous Internet and telephone use.	Telephone cannot be used while connected.

What is meant by bandwidth in data communication?
Answer:

Bandwidth is the maximum amount of data that can be transmitted through a communication channel in one second. It is usually measured in bps, Mbps or Gbps. Higher bandwidth allows faster data transmission.

Why is throughput a more accurate measure of network performance than bandwidth alone?
Answer:

Throughput is the actual amount of data successfully transmitted over a network in a given time. It considers network congestion, delays and packet loss, making it a more accurate measure of network performance than bandwidth.

What are data packets, and how do they function in network communication?
Answer:

Data packets are small units of data into which large files are divided before transmission over a network. Each packet contains the destination address, source address and a portion of the data. The packets travel independently and are reassembled at the destination.

Why is frequency important in wireless communication?
Answer:

Frequency determines how wireless signals travel and how much data they can carry. Higher frequencies generally provide faster data transfer, while lower frequencies offer longer transmission ranges.

What is the difference between wired and wireless communication media?

Answer:

Wired Communication	Wireless Communication
Uses physical cables for data transmission.	Uses radio waves or other electromagnetic signals.
More secure and stable.	Provides greater mobility and flexibility.
Example: Optical Fiber, UTP Cable.	Example: Wi-Fi, Bluetooth.

How does Wi-Fi enable wireless networking in homes and offices?
Answer:

Wi-Fi uses radio waves to connect computers, smartphones and other devices to a wireless router. The router provides Internet access without the need for physical cables, allowing multiple devices to communicate within a local area.

What is the role of Bluetooth in Personal Area Networks (PAN)?
Answer:

Bluetooth enables short-range wireless communication between personal devices such as smartphones, laptops, headphones and smartwatches. It allows data sharing and device connectivity while consuming very little power.

Why is satellite communication useful in remote or rural areas?
Answer:

Satellite communication provides Internet and communication services where wired networks are unavailable. It covers large geographical areas and is useful in remote villages, mountains, oceans and disaster-affected regions.

What is the function of an RJ45 connector in networking?
Answer:

An RJ45 connector is used to connect Ethernet cables to network devices such as computers, switches and routers. It enables the transmission of data in wired networks.

How does a media converter work, and why is it used in networks?
Answer:

A media converter converts data signals from one transmission medium to another, such as from copper cable to optical fiber. It allows different types of networking media to work together and extends network distance.

What is a repeater, and how does it help in extending network range?
Answer:

A Repeater is a networking device that receives weak or damaged signals, regenerates them, and retransmits them to their destination. It extends the communication distance of a network by strengthening weak signals without changing the original data.

What is a network topology?
Answer:

Network topology is the physical or logical arrangement of computers and networking devices in a network. It determines how devices are connected and how data is transmitted between them. Common types include Bus, Star, Ring, Mesh, Tree, and Hybrid topology.

How does a star topology work, and why is it commonly used?
Answer:

In a Star Topology, every computer or device is connected to a central device such as a switch or hub. All communication passes through this central device. It is commonly used because it is easy to install, simple to maintain, and failure of one device does not affect the rest of the network.

What is a PAN, and how is it different from a LAN?
Answer:

A Personal Area Network (PAN) is a small network used to connect personal devices such as smartphones, laptops, and smartwatches within a short distance. A Local Area Network (LAN) covers a larger area such as a home, office, or school and connects multiple computers and devices together.

How is a WAN different from a MAN in terms of coverage and usage?
Answer:

A Wide Area Network (WAN) covers a very large geographical area such as countries or continents and is used to connect networks over long distances. A Metropolitan Area Network (MAN) covers a city or metropolitan area and is used to connect multiple LANs within that city.

What is a client-server architecture?
Answer:

Client-server architecture is a network model in which client computers request services or resources from a central server. The server stores and manages data, applications, and security, while clients access these shared resources through the network.

Why is a peer-to-peer network more suitable for small organizations or home setups?
Answer:

A Peer-to-Peer (P2P) network is suitable for small organizations or home setups because it is inexpensive, easy to install, and does not require a dedicated server. Each computer can share its own resources directly with other computers on the network.

How does the client-server model help in centralizing control?
Answer:

The client-server model centralizes control by storing data, applications, and security settings on a central server. This makes user management, data backup, security, and resource sharing easier and more efficient.

What is an IP address, and why is it necessary in networking?
Answer:

An IP (Internet Protocol) Address is a unique numerical address assigned to every device connected to a network. It is necessary because it identifies devices and enables them to send and receive data over a network or the Internet.

How are IPv4 addresses different from IPv6 addresses?
Answer:

IPv4 uses a 32-bit address and provides about 4.3 billion unique addresses, whereas IPv6 uses a 128-bit address and provides a much larger number of unique addresses to support the growing number of internet-connected devices.

What is the Internet, and how is it different from an intranet?
Answer:

The Internet is a global public network that connects millions of computers worldwide and provides access to information and online services. An Intranet is a private network used within an organization to securely share information and resources among authorized users only.

4. Write Long Answer Questions for the Following

What is a computer network? List the advantages and disadvantages of computer networks.
Answer:

A computer network is a collection of two or more computers and other devices that are connected together to communicate and share data, hardware, software and other resources. Computers in a network can exchange information using communication media such as cables or wireless signals.
Advantages of Computer Networks:
- Allows sharing of files and information among users.
- Enables sharing of hardware devices such as printers and scanners.
- Supports communication through e-mail, video conferencing and messaging.
- Reduces operational cost by sharing resources.
- Allows centralized data storage and management.
Disadvantages of Computer Networks:
- High installation and maintenance cost.
- Network failure can interrupt communication.
- Security threats such as hacking and viruses may spread quickly.
- Requires skilled personnel for management.

What are the components of a computer network? Illustrate them.
Answer:

A computer network consists of several hardware and software components that work together to enable communication and resource sharing.
Main Components of a Computer Network:
- Sender: The device that sends data.
- Receiver: The device that receives data.
- Transmission Media: Wired or wireless medium used to transfer data.
- Data: Parts of information that are being transmitted from sender to receiver.
- Protocols: A set of rules (such as TCP/IP) that govern data communication.
Illustration:
```
    +-----------+      Transmission Media      +-----------+
    |  Sender   | ---------------------------> | Receiver  |
    +-----------+                              +-----------+
    
```

Explain the LAN, MAN and WAN with figures.
Answer:

Computer networks are classified according to the geographical area they cover.

1. LAN (Local Area Network)

A LAN connects computers within a limited area such as a home, school, office or laboratory. It provides high-speed communication and resource sharing.
Figure:
```
     PC1 -----+
              |
     PC2 ---- Switch ----- Printer
              |
     PC3 -----+
    
```
2. MAN (Metropolitan Area Network)

A MAN connects multiple LANs within a city or metropolitan area. It covers a larger area than a LAN but a smaller area than a WAN.
Figure:
```
    LAN -----+
              \
               MAN Network
              /
    LAN -----+
    
```
3. WAN (Wide Area Network)

A WAN connects computers and networks across countries or continents using public communication networks and satellites. The Internet is the largest example of a WAN.
Figure:
```
    City A -------- Internet -------- City B
       |                               |
     LAN                             LAN
    
```

What is topology? Explain different types of topology with suitable diagram.
Answer:

Network topology is the physical or logical arrangement of computers and networking devices in a network. It defines how devices are connected.

1. Bus Topology
- All computers are connected to a single communication cable called the backbone.
- Easy to install but failure of the backbone affects the entire network.
```
    PC ---- PC ---- PC ---- PC
            Backbone Cable
    
```
2. Star Topology
- All computers are connected to a central hub or switch.
- Easy to manage and highly reliable.
```
            PC
             |
    PC --- Switch --- PC
             |
            PC
    
```
3. Ring Topology
- Each computer is connected to two neighboring computers, forming a ring.
- Data travels in one direction around the ring.
```
    PC ------ PC
    |          |
    |          |
    PC ------ PC
    
```

Differentiate between Client-Server Network and Peer-to-Peer Network.

Answer:

Client-Server Network	Peer-to-Peer Network
Uses a dedicated central server.	Does not require a dedicated server.
Resources are managed by the server.	Each computer shares its own resources.
Provides better security and centralized control.	Security and management are decentralized.
Suitable for large organizations and businesses.	Suitable for homes and small offices.
More expensive to install and maintain.	Less expensive and easier to set up.
Example: Banking systems, school management systems.	Example: Home networks and small office networks.

Computer Network and Communication - 10 (Book Exercise)

Exercise Solutions

1. Write the Full Forms of the Following

2. Select the Correct Answer from the Given Alternatives

3. Write Short Answer Questions for the Following

4. Write Long Answer Questions for the Following

1. LAN (Local Area Network)

2. MAN (Metropolitan Area Network)

3. WAN (Wide Area Network)

1. Bus Topology

2. Star Topology

3. Ring Topology