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
HTTPS (HTTP over TLS/SSL) uses TCP port 443 by default for secure web communication.
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Hypertext Transfer Protocol (HTTP)
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Simple Mail Transfer Protocol (SMTP)
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Internet Message Access Protocol (IMAP)
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Remote Desktop Protocol (RDP)
C
Correct answer
Explanation
TCP port 143 is the standard port assigned to IMAP (Internet Message Access Protocol), which is used for retrieving email from a server.
A
Correct answer
Explanation
POP3 is a standard mail protocol used to receive emails from a remote server to a local client. It is officially assigned to TCP port 110.
C
Correct answer
Explanation
DNS is used to resolve domain names into IP addresses. It primarily uses port 53 for both UDP and TCP queries.
B
Correct answer
Explanation
SMTP is the standard protocol for sending emails across the internet. It is assigned to port 25.
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Secure Shell (SSH)
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File Transfer Protocol (FTP)
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Telnet
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Simple Mail Transfer Protocol (SMTP
C
Correct answer
Explanation
Telnet is an older protocol used for remote terminal access. It operates on port 23.
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Port 23
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Port 25
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Port 21
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Port 22
D
Correct answer
Explanation
SSH is a secure protocol used for remote login and command execution. It is assigned to port 22.
C
Correct answer
Explanation
FTP uses two ports: port 21 for control commands and port 20 for data transfer. While 21 is the primary control port, 20 is the dedicated data port.
C
Correct answer
Explanation
FTP uses port 21 for the control connection, which is used to send commands to the server. Port 20 is used for the data connection.
D
Correct answer
Explanation
NetBIOS (Network Basic Input/Output System) operates at the session layer (Layer 5) of the OSI model to allow applications on different computers to communicate.
A
Correct answer
Explanation
TCP is a transport layer (Layer 4) protocol, not a network layer (Layer 3) protocol. IPv4, IPv6, and ICMP all operate at the network layer.
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Transport layer
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Layer 3
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Network layer
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Layer 6
A
Correct answer
Explanation
UDP is a connectionless protocol that provides process-to-process communication, which places it at the transport layer (Layer 4) of the OSI model.
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Layer 3
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Layer 1
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Layer 2
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Layer 4
C
Correct answer
Explanation
Physical addressing, which involves the use of MAC addresses to identify network interface cards, occurs at the data link layer (Layer 2).
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Layer 3
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Layer 1
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Layer 4
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Layer 6
A
Correct answer
Explanation
IP addressing is a logical addressing scheme that occurs at the network layer (Layer 3) of the OSI model, which is used for routing packets.
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Transport layer
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Presentation layer
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Data link layer
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Network layer
A
Correct answer
Explanation
The transport layer is responsible for end-to-end communication, which includes segmenting data from the upper layers into smaller units for transmission.