Computer Knowledge

Computer Networks

2,614 Questions

Computer networks involve the architecture, protocols, and security measures used for digital communication. This collection covers OSI model layers, IP addressing, data transmission, and cryptographic standards. These concepts are vital for the computer knowledge sections of banking and government exams.

OSI model layersNetwork protocolsIP subnet maskingData encryption standardsServer configurationsNetwork commands

Computer Networks Questions

Multiple choice technology operating systems

Which command is used to find Networking information

  1. netstat

  2. ifconfig/all

  3. ipconfig/all

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

The netstat command displays active network connections, routing tables, and interface statistics across various operating systems. While ipconfig /all is used on Windows to view IP configuration details, it is written here with an incorrect syntax (ipconfig/all). nslookup is restricted specifically to querying DNS servers.

Multiple choice technology architecture

What is the name of the process that wraps data with protocol information before network transit ?

  1. Framing

  2. Data packaging

  3. Conversion

  4. Clocking

  5. Encapsulation
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Encapsulation is the process where each layer of the networking model wraps (encapsulates) the received data with its own protocol information (headers, trailers) before passing it down. For example, TCP adds its header to data, then IP adds its header, then Ethernet adds frame header and trailer. This creates a nested structure like an onion.

Multiple choice technology architecture

What is the name of layer 2 of the OSI reference model ?

  1. The physical layer

  2. The transport layer

  3. The data link layer

  4. The network layer
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Layer 2 of the OSI model is the Data Link Layer, responsible for node-to-node data transfer and physical addressing (MAC addresses). Layer 1 is Physical (electrical/signaling), Layer 3 is Network (routing, IP addressing), and Layer 4 is Transport (end-to-end communication like TCP/UDP).

Multiple choice technology architecture

What is the name of layer 4 of the OSI reference model ?

  1. The physical layer

  2. The transport layer

  3. The data link layer

  4. The network layer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Layer 4 of the OSI model is the Transport Layer. It provides end-to-end communication services, including error recovery and flow control. Layers from bottom to top: Physical (1), Data Link (2), Network (3), Transport (4), Session (5), Presentation (6), Application (7).

Multiple choice technology architecture

Which of the TCP/IP layer deals with the quality-of-service issues of reliability, flow control, and error correction ?

  1. The application layer

  2. The internet layer

  3. The network access layer

  4. The transport layer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Transport Layer (Layer 4) in TCP/IP handles reliability (through TCP acknowledgments and retransmissions), flow control (managing data transmission rates), and error correction. TCP provides these services, while UDP is a simpler protocol without them.

Multiple choice technology architecture

The application layer of the TCP/IP model consists of the 3 of the OSI models layers. The application and presentation layers are two of them. Which is the third layer ?

  1. Data-link

  2. Session

  3. Transport

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

The TCP/IP Application Layer combines the top 3 OSI layers: Application (Layer 7), Presentation (Layer 6), and Session (Layer 5). The Session layer establishes, manages, and terminates connections between applications.

Multiple choice technology architecture

In TCP/IP model, which protocol serves as a universal protocol that allows any computer anywhere to communicate at any time ?

  1. TCP

  2. IP

  3. HTTP

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

IP (Internet Protocol) is the universal protocol that provides the addressing and routing mechanism for all internet communication. Every device on the internet has an IP address, enabling global connectivity. TCP, HTTP, and FTP all build on top of IP.

Multiple choice technology architecture

Which OSI layer provides network services only to applications outside OSI model ?

  1. The physical layer

  2. The application layer

  3. The presentation layer

  4. The network layer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Application Layer (Layer 7) is the top OSI layer that directly interfaces with user applications outside the OSI model. It provides network services like file transfer, email, and web browsing to applications. Lower layers (Physical, Network) handle technical transmission aspects, while Presentation handles data formatting. The Application Layer is the only layer that applications directly interact with.

Multiple choice technology architecture

How many layers are there in OSI reference model ?

  1. 2

  2. 3

  3. 5

  4. 7
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The OSI reference model consists of exactly 7 layers: Physical (1), Data Link (2), Network (3), Transport (4), Session (5), Presentation (6), and Application (7). This 7-layer architecture is a fundamental concept in networking. Options A (2), B (3), and C (5) are all incorrect - they don't represent the complete OSI model structure.

Multiple choice technology architecture

What is the name of layer 3 of the OSI reference model ?

  1. The physical layer

  2. The transport layer

  3. The data link layer

  4. The network layer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Layer 3 of the OSI reference model is the Network Layer. This layer handles routing, logical addressing (IP addresses), and path determination between networks. It's responsible for forwarding packets to their destination across multiple networks. The Physical layer is Layer 1, Transport is Layer 4, and Data Link is Layer 2 - so options A, B, and C are incorrect.

Multiple choice technology architecture

What is the name of layer 1 of the OSI reference model ?

  1. The physical layer

  2. The transport layer

  3. The data link layer

  4. The network layer
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Layer 1 of the OSI reference model is the Physical Layer. This layer deals with the physical connection between devices and transmission of raw bit streams over the network medium. It specifies electrical, mechanical, and procedural requirements for activating and deactivating physical connections. Transport is Layer 4, Data Link is Layer 2, and Network is Layer 3.

Multiple choice technology architecture

What is exchanged between layers in peer-to-peer communication ?

  1. Segments

  2. Logical addresses

  3. Frames

  4. Protocol data units

  5. Data
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In layered architecture, each layer communicates with its peer layer on another device. The data unit exchanged between peer layers is called a Protocol Data Unit (PDU). Different layers have different PDU names - segments at transport layer, packets at network layer, frames at data link layer - but collectively they're all PDUs.