17 wan technologies
TRANSCRIPT
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WAN Technologies
WAN TECHNOLOGIES
Version 3.0Cisco Regional Networking Academy
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Objectives
Examines some of the options available for WANinterconnections, the hardware needed toimplement them, and the terminology used to
discuss them.
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Table of Content
1 WAN technologies overview2 WAN technologies
3 WAN design
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WAN TECHNOLOGIES OVERVIEW
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WAN technology
A WAN is a data communications network thatoperates beyond the geographic scope of a LAN
A company or organization must subscribe to anoutside WAN service provider in order to use WANcarrier network services
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Part of WAN service
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Subscriber to Provider Interface
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WAN Devices
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WAN standard: The physical layer
The physical layer protocols describe how toprovide electrical, mechanical, operational, andfunctional connections to the services provided by a
communications service provider.
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Physical layer standard
EIA/TIA-232: Up to 64 kbps. ~V.24, RS-232.
EIA/TIA-449: Up to 2 Mbps, capable of longer cableruns.
EIA/TIA-612/613: HSSI, Access to services at T3,E3 and SONET STS-1 rates.
V.35: An ITU-T standard, synchronous.
X.21: An ITU-T standard, synchronous.
G.703: An ITU-T specification, operating at E1 datarates.
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Datalink Layer
The data link layer protocols define how data isencapsulated for transmission to remote sites, andthe mechanisms for transferring the resulting
frames.
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Data link layer: WAN protocols
Frame Relay: Transmit data very rapidly comparedto the other WAN protocols.
PPP: Described by RFC 1661, PPP was developed by
the IETF.
ISDN: Digital services that transmits voice and dataover existing phone lines.
LAPB: LAPB provides reliability and flow control on apoint-to-point basis.
HDLC: An ISO standard, HDLC might not becompatible between different vendors.
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WAN encapsulation
Flag Header Data FCS Flag
Address Control Protocol
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Packet and circuit switching
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WAN Link options
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WAN TECHNOLOGIES
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Analog dialup
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ISDN
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Leased line
CSU/DSU
CSU/DSU
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X.25
CSU/DSU
CSU/DSU
CSU/DSU
SVC
PVC
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Frame Relay
CSU/DSU CSU/DSU
PVC
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ATM
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DSL
Service Download Upload
ADSL 1.544-8.192Mbps 16-640Kbps
SDSL 1.544-2.048Mbps 1.544-2.048Mbps
HDSL 1.544-2.048Mbps 1.544-2.048Mbps
IDSL 144Kbps 144Kbps
RADSL 64Kbps-8.192Mbps 16-768Mbps
CDSL 1Mbps 16-160Kbps
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Cable modem
Enhanced cable modems enable two-way, high-speed data transmissions using the same coaxiallines that transmit cable television
A cable modem is capable of delivering up to 30 to
40 Mbps of data on one 6 MHz cable channel
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WAN DESIGN
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Steps in WAN design
LOCATE LANs
ANALYZE TRAFFICS
PLAN TOPOLOGY
PLAN BANDWIDTH
CHOOSE TOPOLOGY
COST AND EVALUATE
Iterate
Review
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How to identify and select networking capabilities
Selecting an interconnection pattern or layout forthe links between the various locations
Selecting the technologies for those links to meet
the enterprise requirements at an acceptable cost
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Three-layer design model
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Other WAN design considerations
Security
Server placement in WANs
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Summary
Familiarity with WAN terminology describingequipment, such as CPE, CO, local loop, DTE, DCE,CSU/DSU, and TA
Familiarity with WAN terminology describing servicesand standards, such as ISDN, Frame Relay, ATM, T1,HDLC, PPP, POST, BRI, PRI, X.25, and DSL
Elements of WAN design, including upgrading,extending, modifying an existing WAN, andrecommending a WAN service to an organizationbased on its needs
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Q&A
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