CIS 3210 Lecture Notes - Lecture 24: Network Layer, Glossary Of Ancient Roman Religion

• School: University of Guelph
• Department: Computing and Information Science
• Course: CIS 3210
• Professor: Xiaodong Lin

Document Summary

The network service model de nes the characteristics of end-to-end delivery of packets between sending and receiving hosts. Examples of services by the network layer given on page 8. In reality the network layer provides a single service, known as best-e ort service. Using header eld values, lookup output port using forwarding table in input port memory ( match plus action ) Destination-based forwarding: forward based only on destination ip address (traditional) Generalized forwarding: forward based on any set of header eld values. Longest pre x matching - when looking for forwarding table entry for given destination address, use longest address pre x that matches destination address. We"ll see shy longest pre x matching is used shortly, when we study addressing. Longest pre x matching: often performed using ternary content addressable memories (tcams) which is a specialized type of high-speed memory that searches its entire contents in a single clock cycle.