TFTP and DNS are protocols of which layer?
TFTP and DNS are protocols of which layer?
Answer: D. Application Layer — Answer: Application Layer Both Trivial File Transfer Protocol (TFTP) and Domain Name System (DNS) are application-layer protocols that provide services used…
- A.
Physical Layer
- B.
Data Link Layer
- C.
Transport Layer
- D.
Application Layer
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Correct answer: D
Answer: Application Layer
Both Trivial File Transfer Protocol (TFTP) and Domain Name System (DNS) are application-layer protocols that provide services used by applications.
TFTP — a simple file transfer protocol; typically uses UDP port 69.
DNS — provides name resolution; uses UDP port 53 for most queries and TCP port 53 for zone transfers and large responses.
Because these protocols define application-level services and run on top of transport-layer protocols (UDP or TCP), they are classified at the Application Layer.