Computer Knowledge

Computer Networks

2,256 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 physics universe and space science launching of an artificial satellites around the earth launching of satellite india’s space programmes

Why would a switch be used in a network in preference to a HUB ?

  1. To reduce the network traffic

  2. To prevent the spread of all viruses

  3. To connect a computer directly to the internet

  4. To manage password security at the work station
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A switch can be used in a network in preference to HUB because a switch helps far better than a HUB to reduce the network traffic.

Multiple choice evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

 How does communication between satellite be achieved

  1. Using satellite cross-links

  2. Intersatellite links (ISLs)

  3. Through ground stations

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A crosslink is when satellites communicate directly with eachother, instead of communicating with a ground station which, in turn, communicates with other satellites. Frequencies that are quickly attenutated in the atmosphere are commonly used, making the link undetectable and unjamable from the ground.


ISLs permits a satellite to communicate, when it is not visible from a receiving ground station, using a geostationary TLC satellite.

Multiple choice evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

Which of the following is not advantage of satellite communication?

  1. can reach over large geographical area

  2. circuit costs independent of distance

  3. broadcast possibilities

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

A communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.

It has a number of advantages-
1. Mobile communication can be easily established by satellite communication.
2. Satellite communication is economical compared with terrestrial communication particularly where long distances are involved.
3. User has control over their own network.
4. It spreads over a large geographical area.
5. Broadcast over very large distances is possible only due to these satellites.

Multiple choice record management and office equipment business office - meaning, importance, functions and departments office management business organisation business studies office circulars concept of office management

_______ is the most instantaneous means of communication among the following.

  1. Courier

  2. Fax

  3. Email

  4. Mail
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Email allows for near-instantaneous transmission of messages globally, making it faster than physical mail, couriers, or traditional faxing.

Multiple choice physics option c: imaging fibre optics basics optical fibre the critical angle, total internal reflection and optical fibre

What is the maximum range up to which fiber optic can be used without repeater in communication systems?

  1. 4 km

  2. 10 km

  3. 100 km

  4. 500 km
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The maximum distance of optical link first depends on the quality of the fiber used as a medium of transmission and the insertion losses of sub-systems utilized along the link. These factors mainly limit the span the the optical repeaters required for a designed link.

limit is generally 80-100 Km and when used with amplifiers 500 km

Multiple choice physics option c: imaging fibre optics basics optical fibre the critical angle, total internal reflection and optical fibre

(A): Optical fibres are widely used to communication network.
(R) : Optical fibres are small in size, light weight, flexible and there is no scope for interference in them.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A)

  2. Both (A) and (R) are true but (R) is not the correct explanation of (A)

  3. (A) is true but (R) is false

  4. (A) is false but (R) is true
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Optical fibres are widely used to communication network because they are small in size, light weight, flexible and there is no scope for interference in them. They are easy to handle due to it's small size, light weight and flexibility. They can be placed wherever we need. Further in this case, due to the no scope for interference , information cannot be loss or damage.

Multiple choice organization of commerce and management emerging modes of services e-advertising, e-marketing and e-security structure of business introduction to internet and e-commerce

Data furnished in the course of online transactions may be supplied to others who may start dumping a host of advertising and promotional literature into your e-mail box.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the course of online transactions, data furnished can be supplied to others users who may have started using host websites for dumping their advertisement and promotional literature into their mail box. 

Multiple choice physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

Without which of the following a generalized block diagram of communication system is incomplete?

  1. Channel

  2. Receiver

  3. Transmitter

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

Transmitter - which converts the signal in an electrical signal and then sends it.

Channel - which carries the signal.
Receiver - which receives and converts the signal in original form.

These three are essential  for a communication system.

Multiple choice physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

What are the three essential part of a communication system?

  1. transmitter, channel and receiver

  2. transmitter, information source and receiver

  3. information source ,transmitter and channel

  4. transmitter , noise and channel
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transmitter- which converts the signal in an electrical signal and then send it. Channel - which carries the signal.

Receiver - which receives and converts the signal in original form.
These three are essential  for a communication system.

Multiple choice physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

A complete communication system must include:

  1. a transmitter and receiver

  2. a transmitter, a receiver, and a channel

  3. a transmitter, a receiver, and a spectrum analyzer

  4. a multiplexer, a demultiplexer, and a channel
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A communication system requires a transmitter to upload the signal, a receiver to receive the signal and a channel to carry this information

Multiple choice wireless connections parts of computer physics

In a ..................., a mobile station always communicates with just one base station. 

  1. Messaging hand off

  2. Hard hand off

  3. Soft hand off

  4. Roaming hand off
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a Hard hand off a mobile station always communicates with just one base station.

A hard handoff is a handoff technique used with cellular networks that requires the user's connection to be entirely broken with an existing base station before being switched to another base station. ... A hard handoff is also known as a hard handover or break-before-make handover.

 The handover or handoff process is of major importance within any cellular telecommunications network. It is necessary to ensure it can be performed reliably and without disruption to any calls.

SOft Handover:- When mobile ( in Call0 switches to a new sector/cell which is on the same frequency then it is called a soft handover. If the "new" sector is also from the same BTS then it is called a softer handover. UMTS networks omplements all types (Hard/Soft/Softer) of handovers.

Different approaches are proposed and applied in order to achieve better handoff service. The principal parameters used to evaluate handoff techniques are: forced termination probability and call blocking probability. ... Handoff (or handover) process is transferring an active call from one cell to another.

Multiple choice wireless connections parts of computer physics

A wireless network is also known as a/an ________.

  1. Wi-Fi network

  2. Internet

  3. Intranet

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A wireless network, specifically one using the IEEE 802.11 standards, is commonly referred to as a Wi-Fi network.