Physical & Data-link ISQS 6343 #2 John R. Durrett.

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Presentation transcript:

Physical & Data-link ISQS 6343 #2 John R. Durrett

Media Access Methods Most important choice is MAC Drives: cable installed performance, cost, reliability IEEE 802 series standards Frame layout: Mac head | LLC head | IP | TCP | data | CRC ARCnet (obsolete)

Token Ring Pros: Cons: Details: fast, reliable well supported by IBM expensive, not widely accepted Details: token-based physical: star or bus, logical: bus IEEE 802.5 STP, Coax, Optic fiber, UTP

Ethernet Bob Metcalfe CSMA/CD Carrier Sense - used/idle Multiple Access - equal right to access baseband - one transmission at a time Collision Detection Physical: star, Logical: bus

High-Speed Ethernet Full Duplex 100BaseT 100VG new hubs, etc. UTP, STP, Fiber Round Trip delay == limits cable length 100VG demand priority four pairs Cat 3

High-Speed Ethernet

Other High-Speed MAC FDDI Fiber Backbone CDDI ATM

Network Cabling Circulatory system of network Documentation (BA slides) Installation very labor intensive ANSI/TIA/EIA 568 & 569 generic voice & data standards multi-vendor performance & technical criteria Media, Topology, Distances, Interfaces, Hardware, Performance

Topologies Physical - way components are connected Electrical - how functions as a circuit Logical - way system functions as a whole Bus ends terminated simple to run, hard to fix Star hub=based, main choice Ring like bus but no termination

Cabling Coaxial Thick net (Ethernet 10B5) Thin net (Ethernet 10B2) STP UTP (dominates LANs) 10BT, IEEE 802.3 4 pair up / cable Cat 3, 4, 5 distance & signaling rate 100m total/client Electrical interference Fiber

Network Interface Cards Maintain consistency in every network device physical: electrical connection data-link: assembles frames media dependent MAC dependent Protocol independent Bus type, configuration, remote boot, client Vs. server

Repeaters Clean-up, amplify, rebroadcast physical layer media dependent protocol independent all other active network components contain repeater functionality

Hubs Concentrators Multi-port repeaters Standalone Vs. stackable Manageability

Bridge Data-link layer frame-based media dependent higher protocol independent physical address of source & destination part of frame header Listens for “outbound” address

Router Media independent higher protocol independent packet headers used for logical addresses More complex decisions than hubs Network layer routable upper-level protocol

Gateways Translation at 1 or more layers Most common at upper three layers Ex: SMTP to MHS

Switch Broadcast Vs. virtual circuit Store-and-forward cut-through error checking filtering security cut-through speed Virtual LANs

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