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📝 Link Layer Addressing in Data Link Layer

📖 From Data Communication & Networks • 9. Introduction to Data Link Layer • 21 questions available

Practice MCQs for Link Layer Addressing in Data Link Layer. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-31

7
Easy Questions
8
Medium Questions
6
Hard Questions

📝 Sample Questions

Q1. When a frame leaves host A with source link address \(L_1\) and destination \(L_2\) and reaches router R, which statement must be true about the next frame’s link addresses on the outgoing link?

🔹 A. The source address stays \(L_1\).
🔹 B. The source address becomes the router’s outgoing‑interface address.
🔹 C. The destination address becomes \(L_1\).
🔹 D. Both source and destination addresses remain unchanged.

💡 Difficulty: easy | ✅ Correct: B

Q2. If a frame’s destination MAC address is mistakenly set to a host that is not on the next link, what is the most likely effect on packet delivery?

🔹 A. The frame will be broadcast to all nodes on the link.
🔹 B. The frame will be dropped by the switch/router.
🔹 C. The frame will be forwarded to the incorrect host, causing a routing loop.
🔹 D. The frame will be queued until the correct MAC is learned.

💡 Difficulty: medium | ✅ Correct: D

Q3. Consider three consecutive links with MAC pairs \((L_1,L_2)\), \((L_4,L_5)\), and \((L_7,L_8)\). If a frame is observed on the third link with source \(L_7\) and destination \(L_8\), which inference is logically valid?

🔹 A. The frame originated at the first host.
🔹 B. The frame has traversed exactly two routers.
🔹 C. The original IP source address must be \(N_1\).
🔹 D. The MAC address \(L_5\) is still present in the frame.

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 Data Link Layer basics📝 Nodes and Links in Data Link Layer📝 Services in Data Link Layer📝 Two Categories of Links in Data Link Layer📝 Two Sublayers in Data Link Layer
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