210-250 · Question #124
Which protocol is primarily supported by the Fourth layer of the Open Systems Interconnection reference model?
The correct answer is C. TCP/UDP. OSI Layer 4 is the Transport Layer, which is responsible for end-to-end communication between hosts using TCP and UDP as its primary protocols.
Question
Which protocol is primarily supported by the Fourth layer of the Open Systems Interconnection reference model?
Options
- AHTTP/TLS
- BIPv4/IPv6
- CTCP/UDP
- DATM/ MPLS
How the community answered
(55 responses)- A5% (3)
- B2% (1)
- C91% (50)
- D2% (1)
Why each option
OSI Layer 4 is the Transport Layer, which is responsible for end-to-end communication between hosts using TCP and UDP as its primary protocols.
HTTP operates at OSI Layer 7 (Application Layer) and TLS operates at Layer 5-6, neither of which is the Transport Layer.
IPv4 and IPv6 are Layer 3 (Network Layer) protocols responsible for logical addressing and packet routing between networks.
TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are the defining protocols of OSI Layer 4, the Transport Layer. TCP provides reliable, connection-oriented delivery with flow control and error correction, while UDP offers faster, connectionless delivery. Both protocols handle segmentation and port-based multiplexing between source and destination hosts.
ATM operates primarily at Layer 2 (Data Link Layer) and MPLS functions between Layers 2 and 3, not at the Transport Layer.
Concept tested: OSI Layer 4 Transport Layer protocols
Source: https://learningnetwork.cisco.com/s/article/osi-model-reference-chart
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