CLASS 8 CHAP 6 COMMUNICATION TECHNOLOGY

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CHAPTER 6

COMMUNICATION TECHNOLOGY

AA.   Fill in the blanks with the help of the given words.

1.    In Ring topology, all the data pass from one node to the next node in a circle before reaching their destination.

2.    A Router is used to forward (route) data packets to other network when the destination address is outside its network.

3.    A hub is the most basic networking device that connects multiple computers or other network devices together.

4.    Bluetooth uses a radio frequency that allows transmission through short rage connections between desktop, laptop computers and PDAs.

5.    The network specific to the users within the organization is called the Intranet.

BB.  Tick the correct answer.

1.    Coaxial cables are used by telephone companies, from their central offices to the telephone poles near the users.

2.    PAN generally covers a range of less than 10 meters (about 30 feet).

3.    Gateway is used to connect two networks of different types. It acts as an entrance to another network.

 

4.    ATM is an example of : WAN

5.    Which topology consists of a long communication channel?

Ans- Bus topology

CC.   State True or False

1.    In Ring topology, fewer number of cables are required. TRUE

2.    A switch in a network transfers data to a specific computer TRUE

3.    RJ-45 is derived from the word modulator-demodulator. FALSE

4.    CDMA stands for Code Division Multiple Access. TRUE

5.    A Local Area Network (LAN) is a network spread over an entire city. FALSE 

LONG Q/A

Q1. Write the full form of the following abbreviations:-

1.  PAN- Personal Area Network

2.  LAN- Local Area Network

3.  WAN- Wide Area Network

4.  GSM- Global system for mobile communication

5.  CDMA- Code division multiple access

6.  NIC- Network Interface Card

Q2. Define a computer network.

Ans2. A computer network is a group of two or more than two computers that are linked together to share the information and resources.

Q3. List the components that are required for wired and wireless communication.

Ans3. Following components are required for wired and wireless communication:-

·         Network interface card (NIC)

·         Network cable or wireless adapter

  • Router
  • Switch
  • Modem or access point

Q4. On the basis of geographical spread, classify the types of computer networks.

ANS4. Following are the types of computer networks on the basis of geographical spread:-

1.   Personal Area Network (PAN)

2.   Local Area Network (LAN)

3.   Metropolitan Area Network (MAN)

4.   Wide Area Network (WAN)

Q5. Define the term ‘topology’. According to you, which topology is most reliable and why?

Ans5. Topology is the arrangement of nodes connected to one another in a network. Mesh topology is the most reliable topology.

Q6. Compare bus, star and ring topology. Write any two points to compare them.

ANS6.

 

BUS

RING

STAR

Structure

There is a single central cable (backbone) and all computers and other devices connected to it.

All computers and other devices are connected in a circle.

There is a central host and all nodes are connected to it.

 

Ease of trouble shooting

Difficult. Need to search for the problematic node one by one. It is easy to install and to add and remove nodes.

It is easier to find faults in the network.

More nodes can be added easily.

It is reliable. if one connection fails, it does not affect other computers in a network.

It is easier to add and remove nodes

 

 

 

 

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