A packet with the destination IP address 145.36.109.70 arrives at a router…

2025

A packet with the destination IP address 145.36.109.70 arrives at a router whose routing table is shown. Which interface will the packet be forwarded to?

Answer: A. E3 — Final answer: E3 Reasoning: Use longest-prefix match (the most specific route). Check which table entries include 145.36.109.70. 145.36.255.0/24: covers…

  1. A.

    E3

  2. B.

    E1

  3. C.

    E2

  4. D.

    E5

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Correct answer: A

Final answer: E3

Reasoning: Use longest-prefix match (the most specific route). Check which table entries include 145.36.109.70.

  • 145.36.255.0/24: covers 145.36.255.0–145.36.255.255 — does not include 145.36.109.70.

  • 145.36.64.0/18: mask 255.255.192.0, covers 145.36.64.0–145.36.127.255 — this range includes 145.36.109.70.

  • 145.36.128.0/17: covers 145.36.128.0–145.36.255.255 — does not include 145.36.109.70.

  • 145.36.0.0/16: covers 145.36.0.0–145.36.255.255 — includes the address but is less specific than the /18 entry.

Conclusion: The most specific matching route is 145.36.64.0/18, so the router forwards the packet to E3.

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