[Solved] Why can two devices on different networks have the same MAC address without conflict? — Ans: MAC addresses are only unique within the same local network segment | Computer Networks

Computer Networks - Physical and Data Link Layer

Why can two devices on different networks have the same MAC address without conflict?

AMAC addresses are globally unique and never repeated

BRouters change MAC addresses when forwarding packets

CMAC addresses are only unique within the same local network segment

DMAC addresses are dynamically assigned by DHCP

Step-by-Step Solution

Solution:

Step 1: Understand MAC address scope
MAC addresses are unique identifiers within a local network segment but can be duplicated in different networks.
Step 2: Clarify router behavior and address assignment
Routers forward packets using IP addresses and do not change MAC addresses; DHCP assigns IPs, not MACs.
Final Answer:
MAC addresses are only unique within the same local network segment -> Option C
Quick Check:
MAC uniqueness is local network scope [OK]

Quick Trick: MAC uniqueness applies only within local network segments [OK]

Common Mistakes:

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