Network Layer Functions

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Presentation transcript:

Network Layer Functions Logical addressing Routing END TO END DELIVERY

Packetizing Routing and Forwarding Error Control Congestion Control Security

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

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

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

Datagram Approach

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

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) 20 bytes long C) 60 bytes long D) None of the above .