1. Network Layer Functions
Logical addressing
Routing END TO END DELIVERY

2. Packetizing
Routing and Forwarding
Error Control
Congestion Control
Security

3. Network Layer Design Isues
Store-and-Forward Packet Switching
Services Provided to the Transport Layer
Implementation of Connectionless Service
Implementation of Connection-Oriented Service
Comparison of Virtual-Circuit and Datagram Subnets

4. Switching
It is the process of creating temporary connections between two or more devices linked to the switch, but not to each other.
Circuit Switching
Message Switching
Packet Switching
Datagram approach
Virtual Circuit approach

5. Packet Switching Datagram Approach Virtual Circuit Approach
--Connection less service- Data gram Approach
---- Connection Oriented- Virtual Circuit Approach
In data gram approach forwarding decision is based on destination address of the packet
In Virtual Circuit forwarding decision is based on label of the packet

6. Datagram Approach

7. Network Layer Performace
Delay( Transmission , Propagation, Processing ,
Throughput, Queuing Delay)
Packet Loss
Congestion Control- open loop ( Prevention) , closed loop( Removal)- Backpressure and Choke packet

8. MCQ Which of the following IP address class is multicast?
A) Class A B) Class B C) Class C D) Class D
 The ipv4 header size _______.
20 to 60 bytes long B) bytes long C) bytes long D) None of the above .