lec-36 - What's Next. Data Link Layer Introduction and...

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15 Nov 2008  BITS C481 (Computer Networks) 1 What’s Next… Data Link Layer Introduction and services Error detection and correction Multiple access protocols Link-layer Addressing Ethernet Link-layer switches (Hub, Bridge and Switch) PPP and HDLC Link virtualization: ATM, MPLS
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15 Nov 2008  BITS C481 (Computer Networks) 2 Link Layer Addressing Addressing Mapping Protocols ARP RARP BOOTP DHCP
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15 Nov 2008  BITS C481 (Computer Networks) 3 MAC Addresses and ARP 32-bit IP address : Network-layer address Used to get datagram to destination IP subnet MAC (or LAN or physical or Ethernet) address: Function: get frame from one interface to another physically-connected interface (same network) 48 bit MAC address (for most LANs) Burned in NIC ROM, also sometimes software settable
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15 Nov 2008  BITS C481 (Computer Networks) 4 LAN Addresses and ARP Each adapter on LAN has unique LAN address Broadcast address = FF-FF-FF-FF-FF-FF = adapter 1A-2F-BB-76-09-AD 58-23-D7-FA-20-B0 0C-C4-11-6F-E3-98 71-65-F7-2B-08-53    LAN (wired or wireless)
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15 Nov 2008  BITS C481 (Computer Networks) 5 LAN Address (more) MAC address allocation administered by IEEE Manufacturer buys portion of MAC address space (to assure uniqueness) Analogy: (a) MAC address: like Social Security Number (b) IP address: like postal address MAC flat address : portability Can move LAN card from one LAN to another IP hierarchical address NOT portable Address depends on IP subnet to which node is attached
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15 Nov 2008  BITS C481 (Computer Networks) 6 ARP: Address Resolution Protocol Each IP node (host, router) on LAN has ARP table ARP table: IP/MAC address mappings for some LAN nodes < IP address; MAC address; TTL> TTL (Time To Live): time after which address mapping will be forgotten (typically 20 min) Question:  How to determine MAC  address of B knowing B’s IP address?
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This note was uploaded on 07/20/2009 for the course CSIS BITS C481 taught by Professor Prof.virendersinghshekhawat during the Fall '08 term at Birla Institute of Technology & Science, Pilani - Hyderabad.

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lec-36 - What's Next. Data Link Layer Introduction and...

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