Network Layer - Slides (R1)

Network Layer - Slides (R1) - CSCI 232 Computer Networking:...

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CSCI 232 omputer Networking: Computer Networking: Network Layer eorge Blankenship George Blankenship Network Layer George Blankenship 1
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Review • Lower level protocols ncode message for media Encode message for media – Move message across media ove message across intermediate systems to Move message across intermediate systems to end system pper level protocols Upper level protocols – Assemble message rocess message Network Layer George Blankenship 2 – Process message
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Road Map Desktop System Laptop computer Desktop System Transport Laser printer Tower System Telephone Laser printer IBM S/370 Network Physical Desktop System M RS/6000 Modem Modem Router IBM RS/6000 DECstation Fax Desktop System Router Network Layer George Blankenship 3 Laptop computer
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Lesson Outline • Concepts onnection Oriented/Connectionless Connection Oriented/Connectionless – Routing algorithms ddressing Addressing •I P • ICMP • Routing table management Network Layer George Blankenship 4
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Internetworking • A link between networks •Internetworking –Service – Routing and delivery of data between processes on different networks –Routing –Addressing – Accounting services and status info • Independent of network •IP –Network – ubnetwork architectures – Routing of messages across networks Subnetwork –AS –ARP • Provide a defined quality of service (stability, fairness, and optimality) –Encoding –ICMP Network Layer George Blankenship 5 • Function performed in a “router” •Routing
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Service Approaches onnection oriented network service •Internetworking –Service outing Connection oriented network service (CONS) – Virtual circuit established before data transfer Routing –Addressing •IP – VC crosses network – IS-IS traffic moves in VC –Network –Subnetwork • Connectionless network service (CLNS) h NPDU i i d d t (d t ) –AS –ARP ncoding – Each NPDU is independent (datagram) – No implications on lower protocols – Reliability is function of upper protocol –Encoding –ICMP •Routing Network Layer George Blankenship 6
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CONS/CLNS Comparison Issue CLNS CONS Circuit setup Not needed Required Addressing Each packet contains full Each packet contains short g p source and destination address p VC number State information Stateless State table required Routing Each packet is routed independently Route chosen at VC setup, all packets follow same route ffect of router failure one packet in router lost C passing through router Effect of router failure None, packet in router lost VC passing through router must be rebuilt Congestion control Difficult Easy, as long as buffer space exists in VC route Network Layer George Blankenship 7
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Routing Taxonomy on apti e ro ting (static ro ting) •Internetworking –Service outing • Non-adaptive routing (static routing) – Route is determined by separate algorithm advance and loaded into routers Routing –Addressing •IP in advance and loaded into routers (switches)
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Network Layer - Slides (R1) - CSCI 232 Computer Networking:...

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