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
B
Correct answer
Explanation
TCP operates at the Transport Layer (Layer 4) of the OSI model, providing reliable, connection-oriented data transmission with error checking and flow control.
A
Correct answer
Explanation
TCP port 80 is the standard port assigned to HTTP (Hypertext Transfer Protocol), which is used for unencrypted web traffic. DNS uses port 53, FTP uses 20/21, and Telnet uses 23.
B
Correct answer
Explanation
A subnet mask of 255.255.192.0 corresponds to 8 bits for the first octet, 8 bits for the second, and 2 bits for the third (192 is 11000000 in binary). Adding these together (8+8+2) results in 18 bits defining the network portion.
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Online Gaming
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Email
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File Tranfer
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Web Browsing
A
Correct answer
Explanation
UDP is preferred for online gaming because it prioritizes speed and low latency over reliability; lost packets are generally ignored rather than retransmitted, which would cause lag.
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Application
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Phisical
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Network
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Presentation
A
Correct answer
Explanation
The Application Layer (Layer 7) is the top layer of the OSI model and provides the interface for end-user software applications to access network services.
D
Correct answer
Explanation
TCP is a connection-oriented protocol, meaning it establishes a formal connection (the three-way handshake) before data transfer begins to ensure reliability.
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Application
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Session
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Transport
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Network
A
Correct answer
Explanation
The Application Layer is the highest layer in the OSI model, making it the one that interacts directly with software applications used by the user.
C
Correct answer
Explanation
At the Data Link Layer, data is encapsulated into frames. Packets are associated with the Network Layer, and bits are associated with the Physical Layer.
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MAC & LLC
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NIC & MAC
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CCL & NIC
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TCP & UDP
A
Correct answer
Explanation
The Data Link Layer is divided into the Media Access Control (MAC) sublayer and the Logical Link Control (LLC) sublayer.
C
Correct answer
Explanation
SSH (Secure Shell) is the standard protocol used for secure, encrypted remote command-line access to devices. Telnet is unencrypted, and TFTP is for simple file transfers.
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Layer 7
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Transport
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Internet
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Presentation
D
Correct answer
Explanation
The Presentation Layer (Layer 6) is responsible for data translation, compression, and encryption/decryption to ensure the Application Layer can read the data.
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Network
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Transport
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Session
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Physical
B
Correct answer
Explanation
The Host-to-Host layer of the TCP/IP model corresponds to the Transport Layer of the OSI model, as both are responsible for end-to-end communication.
A
Correct answer
Explanation
Telnet is a legacy protocol that uses TCP port 23 for remote terminal access.
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Layer 3
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Layer 1
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Data Link
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Transport
C
Correct answer
Explanation
Switching, specifically Layer 2 switching based on MAC addresses, occurs at the Data Link Layer of the OSI model.