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 sub topologies is used in Wide Area Network?

  1. Complete topology <o:p></o:p>

  2. Partially connected topology

  3. Bus

  4. Mesh
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Partially connected topology is also called irregular topology. It is also used in Wide Area Network and allows multiple routes between hosts. Partially connected topology is the type of Mesh topology.  

Multiple choice

Who makes the all routing decisions in star topology?

  1. Gateway

  2. Switch

  3. Hub

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

It is an electronic device, used to implement the network. This is also used to join the multiple computers together that form a single network segment, due to this computer can communicate directly with each other. Hub comes in variety in different number of ports. E.g. 4 port hub, 8 port hub and so on.                      

Multiple choice

Which of the following has Ethernet as its common implementation?

  1. Star

  2. Bus

  3. Tree

  4. Mesh
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The special hardware has to be used to terminate both ends of the coaxial cable such that a signal traveling to the end of the bus would come back as a repeat data transmission. The common implementation of this topology is Ethernet. It is a widely used LAN protocol. It is a fast and reliable network solution.

Multiple choice

What are the two types of Mesh topology?

  1. Guided & Unguided

  2. Irregular & Complete <o:p></o:p>

  3. Half duplex & Full duplex

  4. Broadcast & Point to point network
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Irregular and Complete are the two types of Mesh topology. These are also called fully connected & partially connected. Fully connected is also called Complete mesh topology and Irregular is also called partially connected mesh topology.  

Multiple choice

Through which medium, modem allows computers to exchange information?

  1. Coaxial cable

  2. Copper wire

  3. Telephone line

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

 Telephone line is a medium through which modem allows computers to exchange information. Modem is a device that translates the digital signals form computer into analog signals that can travel across conventional phone lines. It is the combination of modulation and demodulation.  

Multiple choice

Which device connects the many computers that communicate with each other?

  1. Modem

  2. LAN

  3. Router

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

 It is an electronic device which is used to implement the network. It is also used to join the multiple computers together that form a single network segment, due to this computer can communicate directly with each other. Hub comes in variety in different number of ports. E.g. 4 port hub, 8 port hub and so on.  

Multiple choice

A technician has been asked to troubleshoot an existing switched network but is unable to locate documentation for the VLAN configuration. Which of the following troubleshooting tools allows the technician to map and discover VLAN and port assignments?

  1. cable analyzer

  2. network analyzer

  3. protocol analyzer

  4. knowledge base
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The correct answer is B because a network analyzer (packet sniffer) can capture and analyze VLAN tagged traffic, allowing discovery of VLAN assignments and port mappings. Cable analyzers test physical connectivity, protocol analyzers focus on protocol decoding, and knowledge bases are documentation repositories - none discover live VLAN configurations.

Multiple choice

Refer to the exhibit. The switch and workstation are administratively configured for full-duplex operation. Which of the following statements accurately reflects the operation of this link?

  1. No collisions will occur on this link.

  2. Only one of the devices can transmit at a time.

  3. The switch will have priority for transmitting data.

  4. The devices will default back to half duplex if excessive collisions occur.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In full-duplex Ethernet operation, both devices can transmit and receive simultaneously without collisions because they use separate channels for transmit and receive. Half-duplex requires CSMA/CD and can only transmit in one direction at a time. Full-duplex does not default back to half-duplex due to collisions - collisions are impossible in true full-duplex mode. There is no transmission priority in full-duplex.

Multiple choice

What VLANs are allowed across a trunk when the range of allowed VLANs is set to the default value?

  1. Only the management VLAN

  2. All VLANs except the extended range VLANs

  3. All VLANs except 1 and 1002-1005

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

By default, Cisco switches allow all VLANs (1-4094) across a trunk port. The default trunk configuration does not restrict VLAN traffic unless explicitly configured with the switchport trunk allowed vlan command. This allows all VLANs, including the extended range VLANs, to traverse the trunk link.

Multiple choice

What is multiplexing in telecommunications and computer networks?

  1. It is a method by which multiple analog/digital signals/messages or digital data streams are selected according to the time slot, so that the signals or streams can be moved in a single medium. The signals/streams share a common path at different time intervals.

  2. It is a technique to transmit single signal using a physical channel.

  3. It is a technique to transmit one signal using multiple physical channels.

  4. It is a technique to transmit one signal without a medium.

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

In telecommunications and computer networks, multiplexing (sometimes abbreviated to muxing) is a method by which multiple analog message signals or digital data streams are combined into one signal over a shared medium. The aim is to share an expensive resource.