Question:
Which of the following protocols operate at the Transport Layer of the OSI Model?
Which of the following protocols operate at the Transport Layer of the OSI Model?
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Layer 4 uses port numbers for process-to-process delivery. Which pair is reliable plus lightweight?
Updated On: Jul 2, 2026
- HTTP and FTP
- TCP and UDP
- ARP and RARP
- IP and ICMP
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The Correct Option is B
Solution and Explanation
Step 1: The Transport Layer (Layer 4) handles end-to-end delivery between processes, using port numbers and either reliable or unreliable transport.
Step 2: Sort the options by layer. HTTP and FTP are Application Layer. ARP and RARP map addresses near the Data Link and Network boundary. IP and ICMP are Network Layer.
Step 3: TCP (reliable, connection oriented) and UDP (fast, connectionless) are the two main Transport Layer protocols. The answer is option (B).
Step 2: Sort the options by layer. HTTP and FTP are Application Layer. ARP and RARP map addresses near the Data Link and Network boundary. IP and ICMP are Network Layer.
Step 3: TCP (reliable, connection oriented) and UDP (fast, connectionless) are the two main Transport Layer protocols. The answer is option (B).
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