ASSIGNMENT

UNIT - 3: Introduction to Computer Networks

1) Computer Network

Multiple Choice Questions

1. Which of the following is a collection of independent computers and other hardware interconnected by communication channels?

    (a) Computer

    (b) Networking

    (c) Sharing

    (d) None of the above

2. Which of the following is an advantage of networking?

    (a) Application sharing

    (b) File sharing

    (c) User communication

    (d) All of these

3. Network formed between computers which are spread across the continents is called

    (a) LAN

    (b) WAN

    (c) MAN

    (d) WLAN

4. Which of the following refers to a small, single-site network?

    (a) DSL

    (b) RAM

    (c) WAN

    (d) PAN

5. Modulation and demodulation is performed by

    (a) microwave

    (b) satellite

    (c) modem

    (d) gateway

6. A modem is connected in between a telephone line and a_________

    (a) computer

    (b) serial port

    (c) network

    (d) communication adapter

7. Geometric arrangement of devices on the network is called

    (a) topology

    (b) protocols

    (c) media

    (d) LAN

8. In which of the topology, network components are connected to the same cable?

    (a) Star

    (b) Ring

    (c) Bus

    (d) Mesh

9. Which is the name of the network topology in which there are bi-directional links between each possible node?

    (a) Ring

    (b) Mesh

    (c) Tree

    (d) None of these

10. Suggest the most suitable type of network topology he should use in order to maximise speed and make each computer independent of network breakdowns. [CBSE Question Bank 2021]

    (a) Bus topology

    (b) Star topology

    (c) Ring topology

    (d) Mesh topology

11. In order to allow data transfer from server to only the intended computers which network device is required in the lab to connect the computers?

    (a) Switch

    (b) Hub

    (c) Router

    (d) Gateway

12. ……………… network device is known as an intelligent hub.

    (a) Switch

    (b) Hub

    (c) Router

    (d) Gateway

13. Which of the following topology contains a backbone cable running through the whole length of the network?

    (a) Star

    (b) Bus

    (c) Mesh

    (d) Tree

14. Computer connected to a star topology fails, the entire network will

    (a) also fail

    (b) work unaffectedly

    (c) only server will work

    (d) None of the above

15. Network device that sends the data over optimising paths through connected loop is

    (a) gateway

    (b) hub

    (c) router

    (d) bridge

16. In specific, if systems use separate protocols, which one of the following devices is used to link two systems?

    (a) Repeater

    (b) Gateway

    (c) Bridge

    (d) Hub

17. If all devices are connected to a central hub, then topology is called

    (a) bus topology

    (b) ring topology

    (c) star topology

    (d) tree topology

 

Case Based MCQs

18. Beauty lines fashion incorporation is a fashion company with a design unit and market unit at Bangalore 135m away from each other. The company recently connected their LANs using Ethernet cable to share the stock related information. But after joining their LAN’s they are not able to show the information due to loss of signal in between.

(i) Which device out of the following should you suggest to be installed for a smooth communication?

    (a) Modem

    (b) Repeater

    (c) UPS

    (d) None of these

(ii) Which network is suitable to connect computers across different cities?

    (a) WAN

    (b) MAN

    (c) PAN

    (d) LAN

(iii) The company wants to increase their bandwidth and speed for communication at any cost. Which of the following cable(s) is/are suitable for that?

    (a) Coaxial Cable

    (b) Optical Fibre

    (c) Both (a) and (b)

    (d) None of these

(iv) What will be the best possible connectivity out of the following? You will suggest connecting the new set up of offices in Bangalore with its London based office.

    (a) Satellite Link

    (b) Infrared

    (c) Ethernet

    (d) None of these

(v) Which of the following device will be suggested by you to connect each computer in each of the buildings?

    (a) Switch

    (b) Modem

    (c) Gateway

    (d) None of these

Short Answer Type Questions

1. Write down any two points of differences between

LAN, MAN and WAN.

2. Which device is used to connect dissimilar networks?

3. Identify the following devices:

(i) An intelligent device that connects several nodes to form a network and redirects the received information only to the intended node(s).

(ii) A device that regenerates (amplifies) the received signal and re-transmits it to its destinations.

(iii) A device that is used to connect different types of networks. It performs the necessary translation so that the connected networks can communicate properly.

(iv) A device that converts data from digital bit stream into an analog signal and vice-versa. [Delhi 2014]

4. Write one advantage of bus topology of network. Also, illustrate how four computers can be connected with each other using star topology of network?

5. In networking, what isWAN? How is it different from LAN?

6. Define hub and write its functions and types.

7. Mr. Kavye Shastri, General Manager of Unit Nations corporate recently discovered that the communication between his company’s accounts office and HR office is extremely slow and signals drop quite frequently. These offices are 120 m away from each other and connected by an ethernet cable.

(i) Suggest him a device which can be installed in between the offices for smooth communication.

(ii)What type of network is formed by having this kind of connectivity out of LAN, MAN and

WAN? [Delhi 2012]

8. Define repeaters with its two types.

9. When the computer network uses telephone lines as communication channel then MODEM is used as a data communication device. Now, explain the working of MODEM.

10. Write one advantage of star topology over bus topology and one advantage of bus topology over star topology.

11. When would you prefer

(i) hubs over repeaters,

(ii) bridges over hubs and

(iii) switch over other network devices?

12. Define the following terms:

(i) Baud

(ii) Hubs

(iii) Repeaters

13. Write a short note on mesh topology.

Long Answer Type Questions

Q1. Trine Tech Corporation (TTC) is a professional consultancy company. The company is planning to set up their new offices in India with its hub at Hyderabad. As a network adviser, you have to understand their requirement and suggest to them the best available solutions. Their queries are mentioned as (i) to (v) below.

Physical locations of the blocks of TTC

Block to block distance (in m)

 Human Resource to Conference --> 110 m

 Human Resource to finance      --> 40 m

 Conference to finance              --> 80 m

 

Expected number of computers:

 Human Resource --> 25

 Conference         --> 120

 Finance              --> 90

(i) Which will be the most appropriate block, where TTC should plan to install their server?

(ii) Draw a block to block cable layout to connect all the buildings in the most appropriate manner for efficient communication.

(iii)What will be the best possible connectivity out of the following, you will suggest connecting the new set up of offices in Bangalore with its London based office.

  •   Satellite Link

  •   Infrared

  •   Ethernet

(iv)Which of the following device will be suggested by you to connect each computer in each of the buildings?

  • Switch

  • Modem

  • Gateway

(v) Company is planning to connect its offices in Hyderabad which is less than 1 km. Which type of network will be formed?

Q2. Granuda consultants are setting up a secured network for their office campus at Faridabad for their day-to-day office and web-based activities. They are planning to have connectivity between 3 buildings and the head office situated in Kolkata. Answer the questions (i) to (v) after going through the building positions in the campus and other details, which are given below.

Distance between various buildings

RAVI to JAMUNA Building            -->120 m

RAVI to  GANGA  Building            -->50 m

GANGA to JAMUNA Building         -->65 m

Faridabad Campus to Head Office -->1460 km

Number of computers

Building RAVI      --> 25

Building JAMUNA --> 150

Building GANGA   --> 51

Head Office         --> 10

(i) Suggest the most suitable place (i.e. block) to house the server of this organisation. Also, give a reason to justify your suggested location.

(ii) Suggest a cable layout of connections between the building inside the campus.

(iii) Suggest the placement of the following devices with justification:

(a) Switch                             (b) Repeater                                                             

(iv) The organisation is planning to provide a high-speed link with its head office situated in the Kolkata using a wired connection.  

Which of the following cable will be most suitable for this job?

(a) Optical fibre      (b) Co-axial cable                (c) Ethernet cable

(v) Consultancy is planning to connect its office in Faridabad which is more than 10 km from Head office. Which type of network will be formed?

Q3. The Freshminds University of India is starting its first campus in Ana Nagar of South India with its centre admission office in Kolkata. The university has three major blocks comprising of Office block, Science block and Commerce block is in 5 km area campus.

As a network expert, you need to suggest the network plan as per (i) to (v) to the authorities keeping in mind the distance and other given parameters.

The expected number of computers to be installed at various locations in the university are as follows:

Office Block                   --> 10

Science Block                --> 140

Commerce Block            --> 30

Kolkata Admission Office --> 8

Expected wire distance between various locations

Office Block to Science Block     --> 90 m

Office Block to Commerce Block --> 80 m

Science Block to Commerce Blo  --> 15 m

Kolkata Admission Office to Ana Nagar Campus -> 450  km

(i) Suggest the authorities, the cable layout amongst various blocks inside the university campus for connecting the blocks.

(ii) Suggest the most suitable place (i.e. block) to house the server for this university with a suitable reason.

(iii) Suggest an efficient device from the following to be installed in each of the blocks to connect all the computers.

(a) Modem   (b) Switch     (c) Gateway

(iv) Suggest the most suitable (very high speed) service to provide data connectivity between the admission office located in Kolkata and the campus located in Ana Nagar from the following options:

  • Telephone line

  • Fixedline dial-up connection

  • Co-axial cable network

  • GSM

  • Leased line

  • Satellite connection.

(v) University is planning to connect its campus in Kolkata which is more than 100 km. Which type of network will be formed?

Q4. Quick Learn University is setting up its academic blocks at Prayag Nagar and planning to set up a network. The university has three academic blocks and one human resource centre as shown in the diagram below:

Centre to centre distance between various blocks/centre is as follows:

Law Block to Business Block            -> 40m

 Law Block to Technology Block       -> 80m

 Law Block to HR Centre                 ->105m

 Business Block to Technology Block -> 30m

 Business Block to HR Centre           -> 35m

 Technology Block to HR Centre       -> 15m

The number of computers in each of the blocks/centre are as follows

 Law Block            --> 15

 Technology Block  --> 40

 HR Centre            --> 115

 Business Block      --> 25

(i) Suggest the most suitable place (i.e. block/centre) to install the server of this university with a suitable reason.

(ii) Suggest an ideal layout for connecting these blocks/centres for wired connectivity.

(iii) Which device you will suggest being placed/installed in each of these blocks/centres to efficiently connect all the computers within these blocks/centres?

(iv) The university is planning to connect its admission office in the closest big city, which is more than 250 km from the university, which type of network out of LAN, MAN or WAN will be formed? Justify your answer.

(v) Expand the following

   a) LAN                        b) WAN

Q5. Tech Up Corporation (TUC) is a professional consultancy company. The company is planning to  set up their new offices in India with its hub at Hyderabad. As a network adviser, you have to understand their requirement and suggest to them the best available solutions. Their queries are mentioned as (i) to (v) below.

Physical locations of the blocks of TUC

Block to block distances (in metre)

 Human Resource to Conference --> 60 m

 Human Resource to finance       --> 120 m

 Conference to finance               --> 80 m

Expected number of computers to be installed in each block:

 Human Resource --> 125

 Conference         --> 25

 Finance              --> 60

           

(i) What will be the most appropriate block, where TUC should plan to install their server?

(ii) Draw a block to block cable layout to connect all the buildings in the most appropriate manner for efficient communication.

(iii)What will be the best possible connectivity out of the following, you will suggest connecting the new setup of offices in Bangalore with its London based office?

  • Infrared

  • Satellite Link

  • Ethernet Cable

(iv)Which of the following devices will be suggested by you to connect each computer in each of the buildings?

  • Gateway

  • Switch

  • Modem

(v) Company is planning to connect its Block in Hyderabad which is more than 20 km. Which type of network will be formed?