Chapter 8: Networks

Quick Check

Fill in the blanks:

1. In a computer network, a computer that sends information is called a sender.
2. A physical path through which a message travels from the sender to the receiver is known as the medium.
3. Coaxial cable is a common type of transmission medium used in wired networks.
4. Fibre-optic cables transmit data in the form of fluctuating light.
5. Bluetooth is commonly used in personal area networks (PANs) for short-range communication.

Choose True or False for the following statements.

1. A modem is used to translate digital signals into analog signals for communication over telephone lines. True
2. A switch is similar to a hub but smarter because it can direct data packets to their destination. True
3. Intranet is a network that can be accessed by outsiders without any security measures. False
4. IP address is a 32-bit address that identifies the location of a computer on the Internet and is directly understood by machines. True

Match the columns.

1. TCP/IP → Protocol for reliable data transfer and routing of data packets.
2. HTTP → Used to access web pages on the World Wide Web.
3. FTP → Protocol for exchanging files between computers on the Internet.
4. SMTP → Responsible for exchanging text messages over the Internet.
5. IMAP and POP → Methods to access and manage e-mail messages from different devices.

Time to Perform

A Fill in the blanks.

1. A protocol is a set of rules to be followed during data communication.
2. Computer network is a group of computers and peripherals, connected by a communication channel.
3. Metropolitan Area network is confined to a single metropolitan city.
4. Infrared technology is a short-range communication that covers a range of around 5 meters.
5. The process of translating digital signals into analog signals is called modulation.

B State whether the given statements are true or false.

1. IP address identifies the location of a particular computer on the Internet. True
2. Domain name is also called letter addressing system. True
3. HTTP stands for Hypertext Transport Protocol. False
4. SMTP specifies the format of e-mail messages. True
5. IMAP method is used when you need to check your emails from different devices. True

C Choose the correct answer.

1. ________ stands for Wireless Fidelity.
   a. Wi-Fi
   b. Modem
   c. Hub
   d. Internet
2. ________ is a device that connects multiple devices and computers to a network.
   a. Modem
   b. Hub
   c. Wi-Fi
   d. Internet
3. ________ is a type of cable used in local area network.
   a. Ethernet
   b. Fibre-optic
   c. Cable
   d. Coil
4. Baseband coaxial cable is a ________ -ohm cable.
   a. 50
   b. 70
   c. 60
   d. 90
5. A ____ is a physical path through which the message travels from the sender to the receiver.
   a. medium
   b. protocol
   c. message
   d. sender

D Name the following.

1. A device that sends the message. Sender
2. An example of personal area network. Bluetooth
3. An example of metropolitan area network. Cable TV Network
4. The process of connecting two networks using different protocols. Gateway
5. The first page of a website. Home Page

E Answer the following questions.

1. What is a computer network?
   A computer network is a group of computers and peripherals, connected by a communication channel.
2. Explain how HTTP works.
   a. The client (web browser) submits an HTTP request message to the server.
   b. The server returns a response message to the client.
3. Explain different benefits of networking.
   a. Resource sharing to reduce hardware cost.
   b. Provides a better way to store information.
   c. Helps easily share files.
4. Differentiate between LAN and MAN.
   LAN is limited to a room or building whereas MAN covers an entire city.
5. Explain any two wired mediums.
   a. Ethernet cable: It is used in LANs. It looks like a phone cable. It has 8 wires. The power consumption is less.
   b. Coaxial cable: It is inexpensive. Has high data transmission rate. It has high installation and maintenance cost.