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Network Layer

Network Layer. CS176A Ramya Raghavendra. Routing table [Q1]. Destination Address Range Link Interface 10000000 00000000 00000000 00000000 Through 0 10000000 11111111 11111111 11111111 10000010 00000000 00000000 00000000 Through 1 10000010 00000000 11111111 11111111

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Network Layer

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  1. Network Layer CS176A Ramya Raghavendra

  2. Routing table [Q1] Destination Address Range Link Interface 10000000 00000000 00000000 00000000 Through 0 10000000 11111111 11111111 11111111 1000001000000000 00000000 00000000 Through 1 10000010 00000000 11111111 11111111 10000010 00000001 00000000 00000000 Through 2 10000010 11111111 11111111 11111111 Otherwise 3

  3. Subnetting [Q2] A F D E B C

  4. Subnetting 214 97 254 /23 11010110 01100001 11111110 00000000 9 N bits – 2n addresses : 8 bits – 256 etc Each router: subnet (A,B or C) + 2 of (D, E, F) • Longest Prefix matching (Examples) • 11010110 01100001 11111111 : A • 11010110 01100001 11111110 0000000 : D

  5. NAT Translation Table [Q3]

  6. Dijkstra’s Algorithm Have some fun: http://www-b2.is.tokushima-u.ac.jp/~ikeda/suuri/dijkstra/Dijkstra.shtml

  7. Link State Routing [Q6] u 5 6

  8. Reverse Path Forwarding [Q7] • Controlled flooding • Router receives a broadcast packet • Checks if the packet came on the “shortest unicast link” to the source • Path used to send a unicast packet to source • If so, forwards it on all other links • Else discards it

  9. Illustration of RPF

  10. Questions on Extra Credit?- Is it easy? YesEmail me!ramya@cs.ucsb.edu

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