What layer is responsible for routing messages through an internetwork in the TCP/IP model?

Homework Help: Questions and Answers: What layer is responsible for routing messages through an internetwork in the TCP/IP model?

A. Session
B. Network Access
C. Transport
D. Internet

Answer:

First. let’s understand the question: It’s about which layer is responsible for routing messages through an internetwork in the TCP/IP model.

In this context, “routing” refers to the process of directing data packets from the source to the destination across different networks.

TCP/IP Models: The TCP/IP model is made up of four layers:

• Network Access (or Link layer)
• Internet
• Transport
• Application

Each layer has its specific functions in handling data over the internet.

Given Options: Step by Step Answering

A) Session

• This is a layer in the OSI model, not the TCP/IP model. In the OSI model, the Session layer is responsible for maintaining and managing sessions between two computers, but it doesn’t handle routing.

B) Network Access

• The Network Access layer (also called the Link layer) is responsible for physically transmitting data over the network. It deals with hardware addressing (MAC addresses) and managing connections between devices on the same network. However, it does not handle routing between networks.

C) Transport

• The Transport layer is responsible for end-to-end communication, ensuring that data is transferred reliably between devices. It deals with protocols like TCP (Transmission Control Protocol) and UDP (User Datagram Protocol), but it doesn’t handle the routing of packets across different networks.

D) Internet

• The Internet layer is responsible for routing data packets across multiple networks in the TCP/IP model. It includes the Internet Protocol (IP), which determines the path data takes from the source to the destination across various networks. This is the layer responsible for routing.

Final Answer

Based on the above analysis, the correct answer is:

D) Internet.

The Internet Layer is responsible for routing messages between networks, which makes it the correct answer. It uses IP addressing to determine how packets are routed across multiple networks to their destination.

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