Question

What layer does Protocol X.25 belong to in the DOD model? and in the OSI Model? Port#? What does it stand for and what does it do?

A) DOD Model: Internet Layer, OSI Model: Network Layer, Port# N/A, Stands for eXtended protocol, facilitates extended communication between systems.
B) DOD Model: Host-to-Host Layer, OSI Model: Transport Layer, Port# 25, Stands for eXtended Transmission Protocol, ensures reliable end-to-end communication.
C) DOD Model: Network Access Layer, OSI Model: Data Link Layer, Port# N/A, Stands for eXtended protocol, handles extended communication at the data link layer.
D) DOD Model: Application Layer, OSI Model: Application Layer, Port# 25, Stands for eXtended Transmission Protocol, supports application-level transmission.

Answer 1

Protocol X.25 belongs to the Internet Layer in the DOD model and the Network Layer in the OSI model. It is a widely used protocol for packet-switched communication networks.

Step-by-step explanation:

The correct answer is A) DOD Model: Internet Layer, OSI Model: Network Layer. Protocol X.25 belongs to the Internet Layer in the DOD model and the Network Layer in the OSI model. It does not have a specific port number.

Protocol X.25 stands for eXtended protocol. It was widely used for packet-switched communication networks in the past. It provides connection-oriented communication between systems and handles packet switching, error detection, and retransmission of data.