CCNA 4 v 3 1 Module 2 1

CCNA 4 v 3. 1 Module 2 1

CCNA 4 v 3. 0 Module 2 WAN Technologies 2

Objectives • WAN Technologies Overview • WAN Technologies • WAN Design 3

WAN Technology 4

WAN Service Providers 5

Physical Layer: WANs 6

WAN Line Types and Bandwidth 7

WAN Devices 8

CSU/DSU 9

Modem Transmission 10

WAN Standards 11

WAN Encapsulation 12

WAN Data-Link Protocols 13

Circuit Switching 14

Packet Switching 15

WAN Link Options 16

Analog Dialup 17

ISDN 18

ISDN 19

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. 20

WAN with X. 25 • X. 25 provides a low bit rate, shared-variable capacity that may either be switched or permanent 21

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. 22

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. 23

DSL 24

ADSL Technology 25

Cable Modem • Enhanced Cable Modems enable twoway. High speed data transmissions using the same coaxial lines that transmit cable television. 26

Cable Data Network Architecture 27

Modern WAN 28

Comparing WAN Traffic Types 29

Steps In WAN Design 30

Star Topology 31

Full-Mesh Topology 32

Partial-Mesh Topology 33

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. 34

Internet for WAN Connectivity 35

One-Layer Hierarchy 36