Ccna 4 v3 0 module 2 wan technologies
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CCNA 4 v3.0 Module 2 WAN Technologies. Cisco Networking Academy. Objectives. WAN Technologies Overview WAN Technologies WAN Design. (Phone Company). “Last Mile”. WAN Technology. POP. T1. WAN Service Providers. WAN Authorities. ( ITU-T ), formerly the ( CCITT )

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CCNA 4 v3.0 Module 2 WAN Technologies

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Ccna 4 v3 0 module 2 wan technologies

CCNA 4 v3.0 Module 2WAN Technologies

Cisco Networking Academy


Objectives

Objectives

  • WAN Technologies Overview

  • WAN Technologies

  • WAN Design


Wan technology

(Phone Company)

“Last Mile”

WAN Technology


Wan service providers

POP

T1

WAN Service Providers


Wan authorities

WAN Authorities

  • (ITU-T), formerly the (CCITT)

  • (ISO) International Organization for Standardization

  • (IETF) Internet Engineering Task Force

  • (EIA) Electronic Industries Association


Physical layer wans

Interface Types

Clock Signal

Physical Layer: WANs


Wan line types and bandwidth

WAN Line Types and Bandwidth


Wan devices

WAN Devices

(Access Server)

(Console Server)


Csu dsu

Channel Service Unit/

Digital Service Unit

T1

CSU/DSU

External CSU/DSU


Modem transmission

Modem Transmission


Circuit switching

Circuit Switching

Circuit is created for duration of the call

and torn down after call is over.


Packet switching

Packet Switching


Wan encapsulation layer 2

WAN Encapsulation – Layer 2


Wan data link protocols layer 2

WAN Data-Link Protocols – Layer 2


Ccna 4 v3 0 module 2 wan technologies

HDLC

High-Level Data Link Control (HDLC) - An ISO standard. HDLC might not be compatible between different vendors because of the way each vendor has chosen to implement it. HDLC supports both point-to-point and multipoint configurations.

Cisco uses its own proprietary implementation of HDLC as the default encapsulation on all serial interfaces.

  • HDLC was first developed by IBM


Integrated services digital network isdn

Integrated Services Digital Network (ISDN)

Basic Rate Interface

Primary Rate Interface


Ccna 4 v3 0 module 2 wan technologies

ISDN

Integrated Services Digital Network (ISDN)

  • A set of digital services that transmits voice and data over existing phone lines.

  • ISDN was the phone companies attempt at creating an all digital phone system.

  • ISDN is still popular for dedicated video, voice and remote sites where DSL is not available.


Ccna 4 v3 0 module 2 wan technologies

ISDN

2503 or 2513

2600 w/ WIC1-BU


Leased line

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

WAN with X.25

  • X.25 provides a low bit rate, shared-variable capacity that may either be switched (SVC) or permanent (PVC)

VC = Virtual Circuit


Frame relay

Frame Relay

Frame Relay - By using a simplified framing with no error correction mechanisms over high-quality digital facilities, Frame Relay can transmit data very rapidly, compared to these other WAN protocols.

  • Frame Relay depends on upper layer protocols such as TCP to take care of lost data

    Frame Relay is the successor to X.25 and is designed to run over high speed fiber as well as copper.


Frame relay1

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.


Ccna 4 v3 0 module 2 wan technologies

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 53-byte cell based architecture rather than on a frame-based architecture.


Point to point protocol

Point-to-Point Protocol

Point-to-Point Protocol (PPP) - Described by RFC 1661, two standards developed by the IETF. PPP contains a protocol field to identify the network-layer protocol.

PPP allows for dynamic address allocation and authentication.

  • PAP – Password Authentication Protocol

  • CHAP – Challenge Handshake Authentication Protocol


Broadband

Broadband

  • Broadband refers to a technique which uses multiple frequencies within the same physical medium to transmit data.

  • Generally speaking, Broadband refers to cable modem and DSL modem technologies for the home user.


Ccna 4 v3 0 module 2 wan technologies

Do you get these download speeds???

DSL

Digital Subscriber Line (DSL) technology is a broadband technology that

uses existing twisted-pair telephone lines to transport high-bandwidth

data to service subscribers.


Ccna 4 v3 0 module 2 wan technologies

xDSL

  • The term xDSL covers a number of similar yet competing forms of DSL technologies:

    • Asymmetric DSL (ADSL)

    • Symmetric DSL (SDSL)

    • High Bit Rate DSL (HDSL)

    • ISDN (like) DSL (IDSL)

    • Rate Adaptive DSL (RADSL)

    • Consumer DSL (CDSL), also called DSL-lite or G.lite


Adsl technology

ADSL Technology


Cable modem

Cable Modem

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


Modern wan

Modern WAN


Star topology hub and spoke

Star Topology – Hub and Spoke


Full mesh topology

Full-Mesh Topology


Partial mesh topology

Partial-Mesh Topology


Three layer design model

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

Internet for WAN Connectivity


One layer hierarchy

One-Layer Hierarchy


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