Computer Knowledge
Computer Networks
2,461 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
A
Correct answer
Explanation
H.323 is a standard protocol suite for video conferencing and VoIP. It uses TCP port 1720 for call signaling.
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TCP Ports 5050 and 5051
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UDP Ports 5050 and 5051
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TCP Port 67 and 68
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UDP Port 3389
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SSH on Port 21
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SSH on Port 22
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SSH on Port 69
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SSH on Port 123
B
Correct answer
Explanation
Secure Shell (SSH) is the industry standard for secure remote management of network devices. It operates on TCP port 22.
A
Correct answer
Explanation
Dynamic Host Configuration Protocol (DHCP) is used to automatically assign IP addresses and other network configuration parameters to devices.
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NTP on Port 123
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SNMP on Port 161
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HTTPS on Port 443
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DNS on Port 53
A
Correct answer
Explanation
Network Time Protocol (NTP) is used to synchronize the clocks of computer systems over a packet-switched, variable-latency data network. It uses UDP port 123.
B
Correct answer
Explanation
Remote Desktop Protocol (RDP) is a proprietary protocol developed by Microsoft which provides a user with a graphical interface to connect to another computer over a network connection.
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587, 993, 995
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25, 143, 110
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20, 65, 53
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3389, 5050, 5051
A
Correct answer
Explanation
Secure email transmission typically uses SMTPS (587), IMAPS (993), and POP3S (995). These ports provide encrypted communication channels for mail services.
B
Correct answer
Explanation
Trivial File Transfer Protocol (TFTP) is inherently insecure because it does not provide authentication or encryption. It uses port 69.
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FTP using Port 20/21
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TFTP using Port 69
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SSH using Port 20/21
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DNS using Port 53
A
Correct answer
Explanation
File Transfer Protocol (FTP) is the standard network protocol used for the transfer of computer files between a client and server on a computer network, using ports 20 and 21.
B
Correct answer
Explanation
Normal range VLANs are numbered 1 to 1005. VLAN 1 is the default, and 1002-1005 are reserved for legacy protocols.
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the port shuts down because of a security violation
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they are forwarded to the native VLAN
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they are flooded to all ports, regardless of VLAN
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they are immediately dropped
B
Correct answer
Explanation
When a trunk port receives an untagged frame, it assumes the frame belongs to the configured native VLAN for that trunk.
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Configure Wake-on-LAN for the NIC on the Work PC.
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Switch the Work PC network from “Work” to “Home”.
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Configure a firewall exception on the Home PC.
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Disable the Windows firewall on the Home PC.
C
Correct answer
Explanation
If port forwarding is configured correctly on the router but access fails, the local firewall on the target PC is likely blocking the incoming connection.
A
Correct answer
Explanation
FTP stands for File Transfer Protocol, which is a standard network protocol used for the transfer of computer files between a client and server on a computer network. It operates at the application layer of the Internet protocol suite.
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Internal Protocol
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Information Page
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Internet Protocol
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Internal Processing
C
Correct answer
Explanation
IP stands for Internet Protocol, which is the principal communications protocol in the Internet protocol suite for routing and addressing packets of data across network boundaries.
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Slow Sockets Language
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Secure Safe Language
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Slow Socket Layer
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Secure Socket Layer
D
Correct answer
Explanation
SSL stands for Secure Sockets Layer, a standard security technology for establishing an encrypted link between a server and a client. It has largely been succeeded by TLS (Transport Layer Security), but the term SSL is still widely used.