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Routing MCQs

Practice Routing MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Computer & Networking BasicsRouting

A router decreases an IPv4 packet’s TTL field when?

  • AForwarding the packet to the next hop
  • BReceiving a local keyboard input
  • CWriting data to RAM
  • DResolving a DNS name only
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Correct Answer: A. Forwarding the packet to the next hop
Explanation: Each router forwarding an IPv4 packet decrements TTL, helping prevent packets from circulating indefinitely.
Reference: Standard computer networking fundamentals: routing
Question 2
Computer & Networking BasicsRouting

A routing table is used by a router to choose?

  • AA next hop or outgoing interface for a destination network
  • BA user's application password
  • CA switch's power rating
  • DThe CPU instruction set
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Correct Answer: A. A next hop or outgoing interface for a destination network
Explanation: Routers compare destination IP addresses with routing-table prefixes to determine how packets should be forwarded.
Reference: Standard computer networking fundamentals: routing
Question 3
Computer & Networking BasicsRouting

When multiple routing-table entries match an IP destination, routers generally prefer the route with the?

  • ALongest matching prefix
  • BShortest matching prefix in every case
  • CLargest physical cable
  • DLowest destination IP address
Report an error
Correct Answer: A. Longest matching prefix
Explanation: Longest-prefix matching selects the most specific matching network route.
Reference: Standard computer networking fundamentals: routing