WAN Technologies. Objectives WAN Technologies Overview WAN Technologies WAN Design.

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Presentation transcript:

WAN Technologies

Objectives WAN Technologies Overview WAN Technologies WAN Design

WAN Technology

WAN Service Providers

Physical Layer: WANs

WAN Line Types and Bandwidth

WAN Devices

CSU/DSU

Modem Transmission

WAN Standards

WAN Encapsulation

WAN Data-Link Protocols

Circuit Switching

Packet Switching

WAN Link Options

Analog Dialup

ISDN

Leased Line Leased lines are not only used to provide direct point-to-point connections between Enterprise LANS, they can also be used to connect individual branches to a packet switched network.

WAN with X.25 X.25 provides a low bit rate, shared-variable capacity that may either be switched or permanent

Frame Relay Most Frame Relay connections are based on PVCs rather than SVCs. It implements no error or flow control. Frame Relay provides permanent shared medium bandwidth connectivity that carries both voice and data traffic.

ATM Asynchronous Transfer Mode (ATM) is a technology capable of transferring voice, video, and data through private and public networks. It is built on a cell based architecture rather than on a frame-based architecture.

DSL

ADSL Technology

Cable Modem Enhanced Cable Modems enable two- way. High speed data transmissions using the same coaxial lines that transmit cable television.

Cable Data Network Architecture

Modern WAN

Comparing WAN Traffic Types

Steps In WAN Design

Star Topology

Full-Mesh Topology

Partial-Mesh Topology

Three-Layer Design Model The links connecting the various sites in an area that provide access to the enterprise network are called the access links or access layer of the WAN. Traffic between areas is distributed by the distribution links, and is moved onto the core links for transfer to other regions, when necessary.

Internet for WAN Connectivity

One-Layer Hierarchy