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

What is the concept of network availability in relation to network reliability?

  1. The percentage of time a network is operational and accessible to users.

  2. The probability of a network component or system failing within a given time period.

  3. The maximum time a network component or system can operate without failing.

  4. The average time required to repair or replace a failed network component or system.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Network availability is a measure of network reliability that represents the percentage of time a network is operational and accessible to users.

Multiple choice

Which of the following is a common cause of network failures?

  1. Hardware failures.

  2. Software bugs.

  3. Human errors.

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

Network failures can be caused by a variety of factors, including hardware failures, software bugs, human errors, and natural disasters.

Multiple choice

Which of the following is a common strategy for improving network resilience?

  1. Implementing redundant network components and systems.

  2. Regularly performing network maintenance and upgrades.

  3. Using high-quality network components and equipment.

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

Improving network resilience involves a combination of strategies, including implementing redundant network components and systems, regularly performing network maintenance and upgrades, and using high-quality network components and equipment.

Multiple choice

Which of the following is a common strategy for optimizing network reliability?

  1. Implementing redundant network components and systems.

  2. Regularly performing network maintenance and upgrades.

  3. Using high-quality network components and equipment.

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

Common strategies for optimizing network reliability include implementing redundant network components and systems, regularly performing network maintenance and upgrades, and using high-quality network components and equipment.

Multiple choice

In topology, what is the term for a space that is both connected and locally connected?

  1. Path-Connected Space

  2. Simply Connected Space

  3. Locally Connected Space

  4. Connected Space
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

A locally path-connected space is a space that is both connected and locally connected.

Multiple choice

What is the maximum data rate that can be achieved with 16QAM 3/4 in the downlink channel?

  1. 1 Gbps

  2. 2 Gbps

  3. 3 Gbps

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

The maximum data rate that can be achieved with 16QAM 3/4 in the downlink channel is 4 Gbps.

Multiple choice

What is the maximum data rate that can be achieved with 16QAM 3/4 in the MIMO channel?

  1. 1 Gbps

  2. 2 Gbps

  3. 3 Gbps

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

The maximum data rate that can be achieved with 16QAM 3/4 in the MIMO channel is 8 Gbps.

Multiple choice

Which type of communication system is used for transmitting data and information between trains and wayside equipment?

  1. Global Positioning System (GPS)

  2. Wi-Fi

  3. Bluetooth

  4. Radio frequency identification (RFID)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Radio frequency identification (RFID) systems are commonly employed in railroad communication to transmit data and information between trains and wayside equipment, enabling real-time tracking and monitoring.

Multiple choice

Which type of communication system is used for long-distance communication between railroad control centers and remote locations?

  1. Cellular networks

  2. Radio frequency (RF) communication

  3. Satellite communication

  4. Fiber optic communication
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fiber optic communication is often used for long-distance communication in railroad systems due to its high bandwidth, low latency, and resistance to electromagnetic interference.

Multiple choice

Which network topology is characterized by a central node connected to all other nodes?

  1. Bus Topology

  2. Star Topology

  3. Ring Topology

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

In a star topology, a central node, typically a switch or router, is connected to all other nodes in the network.

Multiple choice

In a bus topology, what type of transmission medium is typically used?

  1. Coaxial Cable

  2. Twisted Pair Cable

  3. Fiber Optic Cable

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

Bus topologies often utilize coaxial cable as the transmission medium due to its ability to carry signals over long distances.

Multiple choice

Which network topology is commonly used in Wide Area Networks (WANs)?

  1. Bus Topology

  2. Star Topology

  3. Ring Topology

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

Mesh topologies are frequently employed in WANs because they provide multiple paths for data transmission, enhancing reliability and redundancy.

Multiple choice

In a ring topology, what happens when a node fails?

  1. The entire network fails

  2. Data is rerouted through other nodes

  3. The failed node is isolated

  4. The network performance is unaffected
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a ring topology, data is passed from node to node in a circular fashion. If a node fails, data is rerouted through other nodes to maintain connectivity.

Multiple choice

Which network topology is most susceptible to single-point failures?

  1. Bus Topology

  2. Star Topology

  3. Ring Topology

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

In a star topology, the failure of the central node can disrupt the entire network, making it susceptible to single-point failures.

Multiple choice

Which network topology is commonly used in home and small office networks?

  1. Bus Topology

  2. Star Topology

  3. Ring Topology

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

Star topologies are widely used in home and small office networks due to their simplicity, ease of installation, and scalability.