Question:
Which protocol operates at the Transport Layer of the OSI model?
Which protocol operates at the Transport Layer of the OSI model?
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Memorize the two main Transport Layer protocols: TCP (reliable, connection-oriented, like a phone call) and UDP (unreliable, connectionless, like sending a postcard). Also, know that IP is the main Network Layer protocol.
Updated On: Jul 2, 2026
- IP
- TCP
- ARP
- ICMP
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The Correct Option is B
Solution and Explanation
Let's identify the OSI layer at which each protocol operates:
(A) IP (Internet Protocol): This is the main protocol of the Network Layer (Layer 3). It is responsible for logical addressing and routing of packets.
(B) TCP (Transmission Control Protocol): This is a core protocol of the Transport Layer (Layer 4). It provides reliable, connection-oriented, end-to-end communication services for applications. UDP (User Datagram Protocol) is the other major Transport Layer protocol.
(C) ARP (Address Resolution Protocol): This protocol operates at the interface between the Data Link Layer (Layer 2) and the Network Layer (Layer 3). Its function is to map a Network Layer address (IP address) to a Data Link Layer address (MAC address).
(D) ICMP (Internet Control Message Protocol): This protocol is used by network devices to send error messages and operational information. It is considered part of the Network Layer (Layer 3).
Therefore, TCP is the protocol that operates at the Transport Layer.
(A) IP (Internet Protocol): This is the main protocol of the Network Layer (Layer 3). It is responsible for logical addressing and routing of packets.
(B) TCP (Transmission Control Protocol): This is a core protocol of the Transport Layer (Layer 4). It provides reliable, connection-oriented, end-to-end communication services for applications. UDP (User Datagram Protocol) is the other major Transport Layer protocol.
(C) ARP (Address Resolution Protocol): This protocol operates at the interface between the Data Link Layer (Layer 2) and the Network Layer (Layer 3). Its function is to map a Network Layer address (IP address) to a Data Link Layer address (MAC address).
(D) ICMP (Internet Control Message Protocol): This protocol is used by network devices to send error messages and operational information. It is considered part of the Network Layer (Layer 3).
Therefore, TCP is the protocol that operates at the Transport Layer.
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