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

Which of the following is not a network-connecting device?

  1. Token ring

  2. Bridge

  3. Gateway

  4. Hub

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is not a network-connecting device. Token ring is an IEEE standard of LAN (IEEE 802.5) in the layered architecture developed by Institution of Electrical and Electronics Engineers, under the project 802 set up in 1980.

Multiple choice

What are the IEEE standards for Metropolitan Area Network (MAN) and Carrier Sense Multiple Access/Collision Detect (CSMA/CD)?

  1. MAN – IEEE 802.3; CSMA/CD – IEEE 802.14

  2. MAN – IEEE 802.14; CSMA/CD – IEEE 802.6

  3. MAN – IEEE 802.6; CSMA/CD – IEEE 802.3

  4. MAN – IEEE 802.3; CSMA/CD – IEEE 802.13

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the right answer as:

MAN - Metropolitan Area Network = IEEE 802.6 CSMA/CD - Carrier Sense Multiple Access/Collision Detect = IEEE 802.3

Multiple choice

An ATM network uses a token bucket scheme for traffic shaping. A new token is put into the bucket every 5 microseconds. What is the maximum substantial net data rate (excluding the header bits)?

  1. 60.5 Mbps

  2. 50.2 Mbps

  3. 42.8 Mbps

  4. None of these

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the right answer. Net token is put every 5 microseconds. Maximum output data rate = m Token arrival rate = 1/5 microsecond =>1000000/5 = 200 kbps The maximum output rate can be obtained from the following expression: C= S(m - token arrival rate), where C = bucket capacity, M = Maximum output rate, S = time for which maximum output is obtained M = C/S + token arrival rate Assume C = 1 Mbps and S = 20 msec to get: M = 1000000000/20 + (200 x 1000) M = 50.2 Mbps

Multiple choice

Repeaters are

  1. SW entities

  2. HW entities

  3. In physical layer

  4. Both 2 & 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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Multiple choice

LLC (Logical Link Layer)

  1. is independent of MAC. LLC is same for Ethernet bus, token ring. LLC is a layer below MAC and LLC interfaces to PL.

  2. is unique to each MAC.

  3. is grouped for bus, ring, wireless LAN’s. That is, all bus MAC’s use one type of LLC, all ring MAC’s use another LLC.

  4. is independent of MAC. Same LLC is emploted in Ethernet bus, token ring.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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