CoMpuTer neTworks – important questions for Boards 2027
CBSE Class 12 Computer Science
Why was ARPANET commissioned in the 1960s? (A) To connect academic and research institutions for scientific collaboration (B) To provide wireless access to homes (C) To establish the first commercial email service (D) To connect television networks across cities
Answer
(A) To connect academic and research institutions for scientific collaboration — ARPANET was commissioned for scientific collaborations between institutions located at different places.
What is a Metropolitan Area Network (MAN), and what type of geographical area does it cover?
Answer
A Metropolitan Area Network (MAN) is an extended form of LAN covering a larger geographical area, such as a city or town, and can extend up to 30-40 km.
An office needs to connect several computers using wired connections. Explain what an Ethernet hub is and how it can be used to connect these devices.
Answer
An Ethernet hub is a network device used to connect different devices through wires. 1. The office can connect several computers to one hub using separate wired network connections, with each computer attached to a line on the hub. 2. When a computer sends data, the data arrives at the hub through its connected line. 3. The hub sends data arriving on any line out on all the other lines, so the connected computers can receive it. 4. The hub does not send data only to its intended destination; if data from two devices arrive at the same time, they collide. An Ethernet hub provides a simple wired connection for office computers, but simultaneous transmissions can cause collisions.
Between which two institutions was the first ARPANET message communicated? (A) UCLA and Stanford Research Institute (SRI) (B) CERN and UCLA (C) SRI and the National Science Foundation (D) CERN and the National Science Foundation
Answer
(A) UCLA and Stanford Research Institute (SRI) — the first message was communicated between the University of California, Los Angeles (UCLA) and SRI.
State the usual data-rate range of a MAN relative to a LAN, and give one example of a MAN.
Answer
Data transfer rate in a MAN ranges in Mbps, but is considerably less than in a LAN. Cable TV network or cable based broadband internet services are examples of a MAN.
When data arrives at one port of an Ethernet hub, describe how the hub handles it and identify which connected devices receive the data.
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Which statement best describes an Ethernet card (NIC)? (A) It is an adapter for a wired network and interfaces a computer with the network. (B) It converts analog signals into digital bits at the receiver. (C) It regenerates weakened signals on a cable. (D) It connects networks only through wireless media.
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Expand the term modem and state what it converts between.
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Two devices transmit data through the same Ethernet hub at the same time. Explain what happens to their data and state the resulting limitation of using a hub.
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What happens to a signal carried over a cable after travelling beyond its usual specified distance of about 100 m? (A) It becomes weaker and may need regeneration. (B) It changes from analog to digital automatically. (C) It is converted into a packet. (D) It becomes stronger as it travels.
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46 more probable questions in this chapter, every one with a full answer.
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