4network - Network Layer: C5 (5.1-5.4) Overview of...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Network Layer: C5 (5.1-5.4) Overview of Functions Comparison of circuit-switched, virtual circuit, and datagram Datagram routing Fragmentation Virtual circuits: X.25 Congestion Control 1 Network Layer Design Issues 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 2 Store-and-Forward Packet Switching The environment of the network layer protocols. fig 5-1 3 Datagram Each packet treated independently Packets can take any practical route Packets may arrive out of order Packets may go missing Up to receiver to re-order packets and recover from missing packets 4 Implementation of Connectionless Service Routing within a diagram subnet. 5 Implementation of Connection-Oriented Service Routing within a virtual-circuit subnet. 6 Virtual Circuit Preplanned route established before any packets sent Call request and call accept packets establish connection (handshake) Each packet contains a virtual circuit identifier instead of destination address No routing decisions required for each packet Clear request to drop circuit Not a dedicated path 7 Virtual Circuits v Datagram Virtual circuits Network can provide sequencing and error control Packets are forwarded more quickly No routing decisions to make Less reliable Loss of a node looses all circuits through that node Datagram No call setup phase Better if few packets More flexible Routing can be used to avoid congested parts of the network 8 Comparison of Virtual-Circuit and Datagram Subnets 5-4 9 Routing Algorithms The Optimality Principle Shortest Path Routing Flooding...
View Full Document

Page1 / 56

4network - Network Layer: C5 (5.1-5.4) Overview of...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online