1349732185 815 C1 Convergencia Servicios

7/27/2019 1349732185 815 C1 Convergencia Servicios

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Chapter 1

Introduction to WAN


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Objetives

Describe how the Enterprise Architectureprovides integrated services over an enterprisenetwork.

Describe key WAN technology concepts.

Select the appropriate WAN technology tomeet different enterprise business requirements.


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WAN Definition

Generally connect devices that are separated by abroad geographical area.

Use the services of carriers (telephone companies,cable companies, satellite systems, and network

providers)

Use serial connections of various types to provide

access to bandwidth.


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WAN Definition


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Growing Business Small Office Home

Office

Few employees LAN for sharing

peripherals andInternet


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Growing Business

Campus Network

Medium size (100+

employees) Multiple LANs

Limited to a fixed

geographic area In-house IT staff


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Growing Business

Headquarter andbranches

IT team and data center

Multiple LANs

WAN connection

Hierarchical modelneeds expansion


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Growing Business

Distributed network

Large size (1000+

employees) Multiple LANs

WAN connection


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Hierarchical Model


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Enterprise Architecture Expansion of the hierarchical model

Divides the enterprise network into:

Physical areas Logical areas

Functional areas


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Enterprise Architecture


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Enterprise Architecture:Campus

Connects the users, server farm and Enterpriseedge

Modular and allows enterprise grows

Include:

Access

Distribution

Core

Server Farm/ Data Center


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Enterprise Architecture:Enterprise Edge

Aggregates the connectivity from variousfunctional areas

Routes the traffic into the campus coresubmodule

Allows the networks to use resources


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Enterprise Architecture:External sites

Branch

Allows businesses to extend the applications andservices to remote locations

Data Center

Responsible for managing and maintaining thedata systems

Teleworker To telecommute is to leverage the network

resources of the enterprise from home


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Enterprise Architectures


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WAN Technologies


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WAN Physical Layer Terminology


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Customer Premises Equipment (CPE)

Equipment located at the subscribers premises andconnected with a telecom channel of a carrier.

Data Communications Equipment (DCE) Devices that put data on the local loop.

Provides an interface to connect subscribers to acommunication link on the WAN cloud.

Data Terminal Equipment (DTE)

Customer devices that pass the data from a customer fortransmission over the WAN.


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Demarcation Point

Separate customer equipment from serviceprovider equipment and its responsability-

Physically, is the cabling junction box.

Local Loop

Last-mile

Connects the CPE to the CO

Central Office (CO)

Local service provider facility


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WAN Physical Layer


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WAN Physical Layer Standards

EIA/TIA-232

Up to 64 kb/s on 25-pin D-connector (RS-232)

EIA/TIA-449/530

Up to 2 Mb/s on 36-pin D-connector (RS-422 / RS-423)

EIA/TIA612/613 (HSSI)

Up to 52 Mb/s on a 60-pin D-connector.

V-35

Up to 2.048 Mb/s using a 34-pin rectangular connector.

X.21

Synchronous digital communications /15-pin D-connector.


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WAN data link layer protocols


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WAN Switching technologies

A circuit-switched network establishes a dedicatedcircuit (or channel) between nodes and terminalsbefore the users may communicate.


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WAN Switching technologies

Packet switching splits traffic data into packets that

are routed over a shared network. Do not require a circuit to be established, and they

allow many pairs of nodes to communicate overthe same channel.


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WAN Technologies


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Leased Lines


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Leased Lines


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Circuit switching: Analog Dial-up


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Circuit switching: ISDN


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Packet switching: X.25


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Packet switching: Frame Relay


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Packet switching: ATM


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Internet Connection: DSL


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Internet Connection: Cable Modem


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Internet Connection: Broadband Wireless


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Internet Connection: VPN


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Internet Connection: VPN


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Internet Connection: MetroEthernet

Reduced expensesand administration

Easy integration withexisting networks

Enhanced businessproductivity


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Choosing WAN Connection

Purpose of the WAN

Geografic Scope

Traffic Requirements Type

Volumes

Quality

Security

Private or Public

Cost


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Choosing WAN Connection

Option Advantage Disadvantage

Leased line Most secure Expensive

Circuit Switching Less expensive Call setup

Packet Switching Less expensive Shared mediaCell Relay (ATM) Best for simulated

use of voice anddata

Overhead

Internet Least expensiveGlobally available

Least Secure


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Summary

The enterprise architecture is an expansion ofthe hierarchical model

WAN works over physical and Data LinkLayer

WAN technologies:

Leased lines

Circuit Switching

Packet Switching

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