Question

Which layer of the OSI model is responsible for IP addressing and routing?

• A. Data Link Layer
• B. Network Layer
• C. Transport Layer
• D. Session Layer

Hint:

Remember: {Routers operate at the Network Layer}, where logical addressing (IP addresses) and packet routing are performed.

Answer 1

The Correct Option is B

Concept: The OSI (Open Systems Interconnection) model is a conceptual framework used to understand how data travels across a network. It consists of seven layers, each responsible for specific networking tasks. The seven layers are:

• Physical Layer
• Data Link Layer
• Network Layer
• Transport Layer
• Session Layer
• Presentation Layer
• Application Layer

The Network Layer is responsible for logical addressing and routing of data packets across networks.
Step 1: Understand IP addressing.
The Network Layer assigns and handles logical addresses, commonly known as IP addresses. Example: \[ 192.168.1.1 \] These addresses uniquely identify devices across networks.
Step 2: Understand routing.
Routing refers to determining the best path for data packets to travel from the source device to the destination device across multiple interconnected networks. Routers operate primarily at the Network Layer.
Step 3: Protocols used at the Network Layer.
Some important protocols operating at this layer include:

• Internet Protocol (IP)
• Internet Control Message Protocol (ICMP)
• Routing protocols such as OSPF and RIP

Step 4: Conclusion.
Since IP addressing and routing are handled by the Network Layer, the correct answer is: \[ \text{Network Layer} \]