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CCNA 4 Chapter 12

WAN Technologies

By

PRAVEENKUMAR P.J

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Objectives

WAN technologies overview

WAN technologies

WAN design

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WAN Technology

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WAN Service Providers

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Physical Layer

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WAN Line Types and Bandwidth

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WAN Devices

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CSU/DSU

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Modem Transmission

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WAN Standards

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WAN Data-Link Protocols

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Circuit Switching

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Packet 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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ISDN

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Leased Line

Leased lines are not only used to provide direct point-to-point connections between enterprise LANs, they canalso be used to connect individual branches to a packet-switched network.

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X.25

X.25 provides a low-bit-rate, shared-variable capacitythat may be either switched or permanent.

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Frame Relay

Most Frame Relay connections are based on PVCsrather than SVCs. It implements no error or flow

control. Frame Relay provides permanent sharedmedium bandwidth connectivity that carries bothvoice and data traffic.

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ATM

Asynchronous Transfer Mode (ATM) is a technology

capable of transferring voice, video, and data throughprivate and public networks. It is built on a cell-basedarchitecture rather than on a frame-based architecture.

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DSL

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Cable Modem

Enhanced cable modems enable two-way, high-speeddata transmissions using the same coaxial lines thattransmit cable television.

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Cable Data Network Architecture

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WAN Design

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Modern WAN

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Steps in WAN Design

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WAN Traffic Types

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WAN Technologies

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Star Topology

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Full-Mesh Topology

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Partial-Mesh Topology

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Three-Layer Design Model

The links connecting the various sites in anarea that provide access to the enterprise

network are called the access links or accesslayer of the WAN.

Traffic between areas is distributed by thedistribution links, and is moved onto the core

links for transfer to other regions, whennecessary.

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Internet for WAN Connectivity

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One-Layer Hierarchy