34 - wan technologies
TRANSCRIPT
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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