Computer Networking MCQs with answers Page - 1

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Q. Which topology has a central hub or switch that connects all devices?

  • (A) Bus
  • (B) Ring
  • (C) Star
  • (D) Mesh
💬 Discuss
✅ Correct Answer: (C) Star
Explanation: In a star topology, all devices connect to a central hub or switch. Bus uses a single backbone cable, Ring connects in a loop, and Mesh connects devices directly.

Published by Ankit Singh ⭐ 8.48K Points at 27-Sep-2025 08:12 am in Computer Networking

Q. Which protocol is used for secure web communication?

  • (A) HTTP
  • (B) HTTPS
  • (C) FTP
  • (D) Telnet
💬 Discuss
✅ Correct Answer: (B) HTTPS
Explanation: HTTPS (HyperText Transfer Protocol Secure) uses SSL/TLS for secure communication. HTTP is not secure, FTP is for file transfer, and Telnet is insecure remote login.

Published by Ankit Singh ⭐ 8.48K Points at 27-Sep-2025 08:12 am in Computer Networking

Q. What does DNS stand for?

  • (A) Domain Network Service
  • (B) Domain Name System
  • (C) Data Numbering Service
  • (D) Distributed Network System
💬 Discuss
✅ Correct Answer: (B) Domain Name System
Explanation: DNS stands for Domain Name System, which resolves domain names into IP addresses.

Published by Ankit Singh ⭐ 8.48K Points at 27-Sep-2025 08:12 am in Computer Networking

Q. Which layer of the OSI model deals with IP addressing?

  • (A) Data Link Layer
  • (B) Transport Layer
  • (C) Network Layer
  • (D) Physical Layer
💬 Discuss
✅ Correct Answer: (C) Network Layer
Explanation: The Network Layer handles logical addressing (IP) and routing. The Data Link Layer uses MAC addresses.

Published by Ankit Singh ⭐ 8.48K Points at 27-Sep-2025 08:12 am in Computer Networking

Q. Which device operates at the Data Link Layer of OSI?

  • (A) Switch
  • (B) Router
  • (C) Hub
  • (D) Gateway
💬 Discuss
✅ Correct Answer: (A) Switch
Explanation: A switch works at the Data Link Layer (Layer 2) using MAC addresses. Routers operate at Layer 3, hubs at Layer 1, and gateways at multiple layers.

Published by Ankit Singh ⭐ 8.48K Points at 27-Sep-2025 08:12 am in Computer Networking

Q. Which IP address class provides the most hosts?

  • (A) Class A
  • (B) Class B
  • (C) Class C
  • (D) Class D
💬 Discuss
✅ Correct Answer: (A) Class A
Explanation: Class A networks have the largest number of hosts due to their 24-bit host portion. Class B and C provide fewer hosts. Class D is for multicast.

Published by Ankit Singh ⭐ 8.48K Points at 27-Sep-2025 08:12 am in Computer Networking

Q. What is the default subnet mask of a Class C IP address?

  • (A) 255.0.0.0
  • (B) 255.255.0.0
  • (C) 255.255.255.0
  • (D) 255.255.255.255
💬 Discuss
✅ Correct Answer: (C) 255.255.255.0
Explanation: Class C addresses use 255.255.255.0 as the default subnet mask, allowing 254 usable hosts.

Published by Ankit Singh ⭐ 8.48K Points at 27-Sep-2025 08:12 am in Computer Networking

Q. Which protocol translates private IPs to public IPs?

  • (A) DNS
  • (B) NAT
  • (C) DHCP
  • (D) ICMP
💬 Discuss
✅ Correct Answer: (B) NAT
Explanation: NAT (Network Address Translation) converts private IP addresses to public ones. DNS resolves names, DHCP assigns IPs, and ICMP is for error messaging.

Published by Ankit Singh ⭐ 8.48K Points at 27-Sep-2025 08:12 am in Computer Networking

Q. Which command is used to check connectivity between two devices?

  • (A) ping
  • (B) tracert
  • (C) netstat
  • (D) ipconfig
💬 Discuss
✅ Correct Answer: (A) ping
Explanation: The ping command checks connectivity using ICMP packets. tracert shows route, netstat shows active connections, ipconfig displays IP info.

Published by Ankit Singh ⭐ 8.48K Points at 27-Sep-2025 08:12 am in Computer Networking

Q. Which protocol is connection-oriented?

  • (A) UDP
  • (B) TCP
  • (C) IP
  • (D) ICMP
💬 Discuss
✅ Correct Answer: (B) TCP
Explanation: TCP (Transmission Control Protocol) is connection-oriented, ensuring reliable data transfer. UDP is connectionless, IP is a routing protocol, and ICMP is used for error reporting.

Published by Ankit Singh ⭐ 8.48K Points at 27-Sep-2025 08:12 am in Computer Networking

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