Computer Knowledge

Computer Networks

2,095 Questions

Computer networks form the backbone of digital communication, connecting multiple devices to share data and resources. This area covers network architectures, transmission media, modems, and topologies like LAN. These concepts are crucial for computer knowledge sections in banking and government exams.

Network topologiesModulation and demodulationNetwork addressingFiber optic cablesWireless infrastructure

Computer Networks Questions

Multiple choice

WiF is

  1. is a trademark of the Wi-Fi Alliance.

  2. the term often used by the public as a synonym for wireless internet.

  3. Wireless Fidelity.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Wi-Fi is a trademarked term often used colloquially to refer to wireless internet access. The term is also widely understood as an abbreviation for Wireless Fidelity, although this is technically a marketing term rather than a formal technical acronym.

Multiple choice

A and B are the only two stations on an Ethernet. Each has a steady queue of frames to send. Both A and B attempt to transmit a frame, collide, and A wins the first backoff race. At the end of this successful transmission by A, both A and B attempt to transmit and collide. The probability that A wins the second backoff race is

  1. 0.5

  2. 0.625

  3. 0.75

  4. 1.0
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Ethernet, the binary exponential backoff algorithm is used after collisions. If two stations collide, each chooses a random slot (0 or 1). The probability that one wins is 0.5. The history of the previous win does not affect the probability of the next independent backoff race.

Multiple choice

In a packet switching network, packets are routed from source to destination along a single path having two intermediate nodes. If the message size is 24 bytes and each packet contains a header of 3 bytes, then the optimum packet size is

  1. 4

  2. 6

  3. 7

  4. 9
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

With 2 intermediate nodes, there are 3 hops. Total overhead is 3 hops * 3 bytes = 9 bytes per packet. To minimize overhead while fitting the 24-byte message, we calculate efficiency; however, in many textbook problems of this type, the packet size is often constrained by the header or specific framing logic. Given the options, 9 is the only one that allows for a balanced division of the message.

Multiple choice

Which topology of the LAN uses circuit switching?

  1. Tree

  2. Bus

  3. Ring

  4. Star

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Star topology uses circuit switching because transmission is always controlled by a centralised hub and route is predecided from root node to receiving node.

Multiple choice

The cheapest modem can transmit

  1. 300 bits per second

  2. 1200 bits per second

  3. 2400 bits per second

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Historically, the earliest and cheapest modems operated at 300 bits per second (bps).