N10-005 · Question #818
Which of the following protocols occurs at Layer 4 of the OSI model?
The correct answer is D. UDP. UDP is a connectionless Transport layer protocol that operates at Layer 4 of the OSI model. The other choices operate at different OSI layers.
Question
Which of the following protocols occurs at Layer 4 of the OSI model?
Options
- AISDN
- BIPX
- CGRE
- DUDP
How the community answered
(27 responses)- B4% (1)
- C7% (2)
- D89% (24)
Why each option
UDP is a connectionless Transport layer protocol that operates at Layer 4 of the OSI model. The other choices operate at different OSI layers.
ISDN (Integrated Services Digital Network) spans Layers 1-3, functioning as a Physical and Data Link layer WAN technology, not a Layer 4 protocol.
IPX (Internetwork Packet Exchange) is a Layer 3 Network layer protocol used in Novell NetWare environments for logical addressing and routing.
GRE (Generic Routing Encapsulation) is a Layer 3 tunneling protocol that encapsulates packets for transport across IP networks, not a Layer 4 protocol.
UDP (User Datagram Protocol) operates at Layer 4 (Transport layer) of the OSI model. It provides connectionless, best-effort delivery of datagrams without establishing a session, making it a core Layer 4 protocol alongside TCP.
Concept tested: OSI Layer 4 transport protocol identification
Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/network-subsystem/net-sub-performance-tuning-overview
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