Question

Match the devices to the OSI layer in which they operate.

• A. A-I, B-II, C-III, D-IV
• B. A-II, B-I, C-II, D-IV
• C. A-IV, B-III, C-II, D-I
• D. A-II, B-III, C-I, D-IV

Hint:

Hub \(\rightarrow\) Physical Layer Bridge \(\rightarrow\) Data Link Layer Router \(\rightarrow\) Network Layer Gateway \(\rightarrow\) Application Layer

Answer 1

The Correct Option is A

Concept: Different networking devices operate at different layers of the OSI model.

Step 1: Identify Hub layer.
A Hub simply broadcasts signals. It operates at the \[ \text{Physical Layer} \]

Step 2: Identify Bridge layer.
A Bridge uses MAC addresses. It operates at the \[ \text{Data Link Layer} \]

Step 3: Identify Router layer.
A Router uses logical IP addresses. It operates at the \[ \text{Network Layer} \]

Step 4: Identify Gateway layer.
A Gateway performs protocol conversion and can operate at higher layers. In OSI mapping questions it is associated with the \[ \text{Application Layer} \]

Step 5: Match the sequence.
\[ \text{Hub} \rightarrow \text{Physical Layer} \] \[ \text{Bridge} \rightarrow \text{Data Link Layer} \] \[ \text{Router} \rightarrow \text{Network Layer} \] \[ \text{Gateway} \rightarrow \text{Application Layer} \] Thus, \[ \boxed{\text{A-I, B-II, C-III, D-IV}} \] is correct.