Q.NO:1 [Case Based MCQ Question] Class 12 Computer Science Computer Network | CBSE | Notes | Study Material

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CBSE Class 12 Computer Science: Important Case Study-Based Questions on Computer Networks

    Prepare for the CBSE Class 12 Computer Science Board Exam 2025, scheduled for March, 2025, by practicing these important case study-based questions from the Computer Networks chapter. These questions are designed to help you understand practical applications and improve your analytical skills. Answers are included for easy reference.

5 Mark Question:

   1. Bias Methodologies is planning to expand their network in India starting with three cities in India to build infrastructure for research and development of their chemical products. The company has planned to setup their main office in Pondicherry at three different locations and have named their offices as Back Office, Research Lab and Development Unit. The company has one more research office namely Corporate Unit in Mumbai. 

A rough layout of the same is as follows:

Approximate distance between these offices is as follows:

In continuation of the above, the company experts have planned to install the following number of computers in each of these offices.

(i) Suggest the kind of network required (out of LAN, MAN, WAN) for connection each of the following office unit

    (a) Research Lab and Back Office

    (b) Research Lab and Development Unit

(ii) Which of the following devices will you suggest for connecting all the computers with each of their office units?

    (a) Switch/Hub         (b) Modem         (c) Telephone

(iii) Which of the following communication media, will you suggest to be procured by the company for connecting their local office units in Pondicherry for very effective (high speed) communications?

    (a) Telephone cable     (b) Optical fiber     (c) Ethernet cable

(iv) Suggest a cable/wiring layout for connecting the company’s local office units located in Pondicherry. Also, suggest an effective method/technology for connecting the company’s office located in Mumbai.

(v) Suggest the most appropriate location of the server inside the Pandicharry campus. Justify your choice.

Data Overview:

• From the Table:

  • Research Lab to Back Office: Distance = 110 meters
  • Research Lab to Development Unit: Distance = 16 kilometers

• From the Map:

  • Research Lab, Back Office, and Development Unit are all located within Pondicherry.
  • Corporate Unit is in Mumbai, approximately 1800 kilometers away.

Key Insights from the Map and Table:

• LAN: Suitable for short distances (e.g., within the same building or campus, as seen with Research Lab and Back Office).
• MAN: Best for medium distances within the same city or region (e.g., Research Lab to Development Unit).
• WAN: Required for long distances, such as connecting the Corporate Unit (Mumbai) with any office in Pondicherry (e.g., Research Lab to Corporate Unit at 1800 km).

Answer

i)

1. Research Lab and Back Office: LAN (Local Area Network)

          Explanation: The distance between these units is 110 meters, making LAN the ideal choice for short-range, high-speed communication.

2.Research Lab and Development Unit: MAN (Metropolitan Area Network)

          Explanation: As the distance is 16 kilometers, a MAN is suitable for medium-range connectivity within the same city.

ii)The suitable device is Switch/Hub, as it enables efficient communication among computers within the same office unit.

iii)(b) Optical fiber

Tips to Identify the Answer:

1. Telephone cable: Generally used for voice communication, not ideal for high-speed data transfer.
2. Optical fiber: Provides the highest data transfer speed and bandwidth, ideal for high-speed communication across long distances. It is resistant to interference and is perfect for modern office setups requiring fast internet.
3. Ethernet cable: While good for local area networks (LAN), it’s slower than optical fiber and typically used for connecting devices within close proximity.

Explanation:
Optical fiber is the best choice for high-speed communication because it uses light signals, which allows for faster data transmission over longer distances without interference. It’s the most efficient option for ensuring very effective and high-speed communication between local office units

iv)

v)Research Lab