Which of the following is true about routers?

Question

BlackTom AI · Accepted Answer

Consider the question: Which of the following is true about routers?
Option a: None of these given options. This is unlikely because at least one option is correct about routers, namely that they operate at Layer 3, so this choice is not accurate.
Option b: A router operates at Layer 2. This statement is incorrect because Layer 2 refers to the Data Link layer, where switches operate. Routers primarily function at Layer 3, though some devices can perform additional tasks, the primary routing function is at Layer 3, not Layer 2.
Option c: A router operates at Layer 3. This is the correct characterization: routers perform network-layer functions, making forwarding decisions based on IP addresses and functioning at the OSI/Internet layer.
Option d: A router preforms frame broadcasting. This wording is incorrect in multiple ways: first, routers do not typically perform frame-level broadcasting; frame broadcasting is more associated with Layer 2 devices like switches or bridges. Second, the word is misspelled, and the behavior described is not a defining router function.
Option e: A router is a part of the Transport layer. This is incorrect because the Transport layer corresponds to Layer 4 (TCP/UDP), whereas routing decisions are made at Layer 3 (Network layer). Routers do not belong to the Transport layer.
In summary, evaluating each choice shows that only the statement about operating at Layer 3 accurately describes a router's primary role, while the others misstate the layer, function, or terminology. The key distinction is that routing is performed based on network-layer addressing (IP) at Layer 3, not at Layer 2 or Layer 4, and not through frame broadcasting.

Which of the following is true about routers?单项选择题

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