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

Refer to the exhibit. A network administrator is creating a prototype to verify the new WAN design. However, the communication between the two routers cannot be established. Based on the output of the commands, what can be done to solve the problem?

  1. Replace the serial cable.

  2. Replace the WIC on RA.

  3. Configure RA with a clock rate command.

  4. Issue a no shutdown interface command on RB.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a serial WAN connection using back-to-back cables, one router must act as DCE and provide clocking. The command output shows the interface is up but line protocol is down, indicating the physical connection exists but synchronization is missing. Configuring 'clock rate' on RA (the DCE device) provides the timing signal needed for the serial link to establish line protocol.

Multiple choice

What speeds up convergence in a network using link-state routing?

  1. Updates triggered by network changes

  2. Updates sent at regular intervals

  3. Updates sent only to directly connected neighbors

  4. Updates that include complete routing tables
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Link-state routing protocols like OSPF send updates immediately when network topology changes are detected, rather than waiting for periodic update intervals. This event-driven approach allows the network to converge much faster because all routers learn about changes almost simultaneously and recalculate their routing tables. Distance-vector protocols, by contrast, typically wait for scheduled update timers, which delays convergence.

Multiple choice

Why are serial connections preferred over parallel connections for long transmission lengths?

  1. Parallel connections do not support error checking.

  2. Parallel connections are subject to excessive attenuation.

  3. Parallel connections are subject to clock skew and to crosstalk between wires.

  4. Parallel connections transmit over only two wires and therefore transmit data more slowly.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Parallel connections transmit data simultaneously over multiple wires, but over long distances, the signals experience timing differences (clock skew) and electromagnetic interference (crosstalk) between adjacent wires. These problems cause data corruption and limit the usable length of parallel cables. Serial connections, using fewer wires (like in RS-232 or USB), don't suffer from crosstalk between data bits and can use differential signaling over longer distances with less signal degradation.

Multiple choice

In LAN installations where potential electrical hazards or electromagnetic interference may be present, what type of media is recommended for backbone cabling?

  1. Coax

  2. Fiber

  3. Cat5e UTP

  4. Cat6 UTP

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

Fiber optic cable is immune to electromagnetic interference (EMI) and radio frequency interference (RFI) because it transmits light rather than electrical signals. It also has no electrical conductivity, eliminating shock hazards in environments with high voltage or explosive atmospheres. Copper media (coax, UTP, STP) are susceptible to EMI and can conduct hazardous voltages.

Multiple choice

Which switching type will allow the communication devices in the provider network to be shared and only allocated to an individual subscriber during data transfer?

  1. Circuit-switched

  2. Dedicated switched lines

  3. Frame-switched

  4. Packet-switched
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Packet-switching shares network resources among multiple subscribers. Unlike circuit-switching which dedicates a fixed path, packet-switching breaks data into packets and dynamically allocates bandwidth only during actual data transfer. This allows multiple users to share the same physical infrastructure efficiently, with resources allocated on-demand.

Multiple choice

Which of the following best describes telnet?

  1. Network of televisions

  2. Network of telephones

  3. Network of computers connected over telephones

  4. Remote login

  5. Downloading files from internet
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Telnet is a network protocol used on the Internet or local area networks to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection.

Multiple choice

What type of system is DNS?

  1. A horizontal naming system

  2. A vertical naming system

  3. A hierarchical distributed naming system

  4. A client server system

  5. A networking system
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Domain Name System (DNS) is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities

Multiple choice

Which of the following statements about bus topology is false?

  1. It is suitable for small networks.

  2. It requires more number of cables.

  3. In bus topology, limited number of stations can be connected.

  4. It is cheap.

  5. It is easy to handle.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

No bus topology requires only single cable. So this choice is incorrect .