Difficulty: Easy
Correct Answer: True
Explanation:
Introduction / Context:
Bridges (and modern Ethernet switches) forward frames based on MAC addresses and maintain forwarding tables to separate collision domains. Understanding the precise OSI placement helps clarify capabilities and limitations, such as lack of IP-layer routing.
Given Data / Assumptions:
Concept / Approach:
Bridges operate at Layer 2 and primarily at the MAC sublayer. They learn source MAC addresses, populate forwarding tables, and filter/forward frames accordingly. They do not interpret IP headers (Layer 3) and therefore do not route between subnets unless additional capabilities are present (that would make them routers or Layer-3 switches).
Step-by-Step Solution:
Verification / Alternative check:
Protocol analyzers show bridges do not modify IP headers; they act on Ethernet frame headers (destination/source MAC).
Why Other Options Are Wrong:
Common Pitfalls:
Confusing Layer-3 switches (which route) with pure Layer-2 bridging.
Final Answer:
True
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