Jan26 - CSE398: Network Systems Design Instructor: Dr....

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CSE398: Network Systems Design Instructor: Dr. Liang Cheng Department of Computer Science and Engineering P.C. Rossin College of Engineering & Applied Science Assistant Professor, Lehigh University January 26, 2005
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Instructor: Dr. Liang Cheng CSE398: Network Systems Design 01/26/05 Outline ± Recap ± Switching and forwarding ± IP (Internet Protocol) ± IP ± UDP and TCP ± Summary and homework
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Instructor: Dr. Liang Cheng CSE398: Network Systems Design 01/26/05 IP Service Model ± Connectionless (datagram) ± Best-effort/unreliable service ± Lost, delivered out of order ± Duplicated, or delayed ± Addressing ± Hierarchical: network + host ± Class A, B, C and D ± Multicast ± Dot notation ± 10.3.2.4, 128.96.34.15, ± 192.12.69.77, 224.54.93.3 ± Subnetting ± Add another level to address/routing hierarchy: subnet ± Subnet masks define variable partition of host part: e.g., 255.255.255.128 Network Host 72 4 0 A Network Host 14 16 10 B Network Host 21 8 110 C Network number Host number Class B address Subnet mask (255.255.255.0) Subnetted address 111111111111111111111111 00000000 Network number Host ID Subnet ID
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Instructor: Dr. Liang Cheng CSE398: Network Systems Design 01/26/05 Packet Routing/Forwarding ± Strategy ± Every datagram contains destination’s address ± If directly connected to destination network, then forward to host ± If not directly connected to destination network, then forward to some router ± Forwarding table maps network number into next hop ± Each host has a default router ± Each router maintains a routing/forwarding table ± Example (R2) Network Number (Subnet# & Mask) Next Hop 1 (128.96.34.0 & 255.255.255.0) R3 2 (128.96.34.128 & 255.255.255.128) R1 3 (128.96.33.0 & 255.255.255.128) interface 1 4 (128.96.33.128 & 255.255.255.128) interface 0 ± Classless interdomain routing (CIDR) ± 128.96.34.0/24 ± 128.96.34.128/25 ± Example: 128.96.34.135 ± Longest match R2 R1 H4 H5 H3 H2 H1 Network 2 (Ethernet) Network 1 (Ethernet) H6 Network 3 (FDDI) Network 4 (point-to-point) H7 R3 H8
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Instructor: Dr. Liang Cheng CSE398: Network Systems Design 01/26/05 Address Translation ± Map IP addresses into physical addresses ± Destination host ± Next hop router ± ARP (Address Resolution Protocol) ± Table of IP to physical address bindings ± Broadcast request if IP address not in table ± Target machine responds with its physical address ± Table entries are discarded if not refreshed
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Instructor: Dr. Liang Cheng CSE398: Network Systems Design 01/26/05 Routing Overview ± Forwarding vs. routing ± Forwarding: to select an output port based on the
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This note was uploaded on 08/06/2008 for the course CSE 398 taught by Professor Cheng during the Spring '05 term at Lehigh University .

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Jan26 - CSE398: Network Systems Design Instructor: Dr....

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