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Chapter 1: Wide-Area

Networking Basics

Exam Objectives

✓ Defining wide-area networking

✓ Explaining WAN connection types

✓ Describing WAN protocol encapsulation methods

✓ Introducing Cisco router cabling standards

✓ Identifying AUX and COM port connectors

✓ Understanding popular DSL technologies

✓ Recognizing the differences between DCE and DTE devices

Introducing WANs

wide-area network (WAN) is a connection between two or more

local-area networks (LANs) spanning across a large, spread-out

geographical area. A single LAN is usually considered to be confined to the

same building or office that does not communicate over public transportation

methods. A metropolitan-area network (MAN) limits its communications to

a specific city function or campus area, while a WAN uses dedicated leased

lines from telephone companies to establish links between geographically

dispersed LANs and/or MANs. WAN technologies are generally represented

by the three lower layers of the OSI model, namely, the network, data link,

and physical layers.

The Internet is the best example of a WAN and is the largest public

network on the planet. As you can see in Figure 1-1, private WANs are used

to establish permanent communications links between company sites and

branch offices. Using routers, traffic is managed and sent to the proper

destination LAN. The traffic is then transferred to LAN switching devices

until the data reaches the intended recipient. Private WANs may use a

number of methods to connect to remote sites, such as dedicated telephone

lines, ATM, Frame Relay, and satellite links. Private WANs may also use

public networks to communicate. Setting up an encrypted VPN over a local

ISP’s DSL service or dialup connection is another cost-friendly alternative

for secure communications.

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Pagina 1 - COPYRIGHTED MATERIAL

Chapter 1: Wide-Area Networking BasicsExam Objectives✓ Defining wide-area networking✓ Explaining WAN connection types✓ Describing WAN protocol encapsu

Pagina 2 - Purpose of WANs

816Introducing Cable Connections ✦ Straight-through: Standard network cable used to connect source and destination interfaces between hubs and switche

Pagina 3 - Cisco serial interfaces

Book VIIChapter 1Wide-Area Networking Basics817Introducing Cable Connections Before connecting a terminal to the console port, configure the termin

Pagina 4 - DCE serial interfaces

818Introducing Digital Subscriber Line (DSL) Connections ✦ RJ-45–to–DB-25 adapter: Connects a router to a PC through a 25-pin serial port.Introducing

Pagina 5 - Connection Types

Book VIIChapter 1Wide-Area Networking Basics819Introducing Digital Subscriber Line (DSL) Connections ✦ PPPoE (Point-to-Point Protocol over Ethernet):

Pagina 6 - Encapsulation Types

Wide-Area Networking BasicsPrep Test 1 Which types of devices control the clock rate and timing synchronization for WAN interfaces? (Choose two.)A ❍

Pagina 7 - Frame Relay

Wide-Area Networking Basics 6 Which simplistic, nonstandard protocol is used to frame and transmit IP datagrams over serial connections?A ❍ ATMB ❍ H

Pagina 8

Wide-Area Networking BasicsAnswers 1 D, E. DCE and CSU/DSU. Data communications equipment (DCE), also referred to as a channel service unit/data servi

Pagina 9

Introducing WANs808 Figure 1-1: WAN. CorporateHeadquartersMobile UserRemote/HomeOfficeBranchOfficeT3 DedicatedLeased LineRemoteSatelittleVPNFrame Rela

Pagina 10 - Introducing Cable Connections

Book VIIChapter 1Wide-Area Networking Basics809Introducing WANs These hardware devices are used to establish the WAN communications link and are re

Pagina 11 - DB-25 cabling and adapters

810Introducing WANs60-pin serial cable may be EIA/TIA-530, EIA/TIA-449, EIA/TIA-232, V.35, or X.21 standard connectors, which I examine in the followi

Pagina 12 - Line (DSL) Connections

Book VIIChapter 1Wide-Area Networking Basics811Connection Types ✦ V.35: The OSI physical layer ITU partially balanced standard that sup-ports high-spe

Pagina 13 - Chapter 1

812Encapsulation Types ✦ Cell-switched connection: A type of point-to-point packet-switched connection that uses digital circuits to transmit 53-byte

Pagina 14 - Wide-Area Networking Basics

Book VIIChapter 1Wide-Area Networking Basics813Encapsulation Typesdialup and ISDN links. PPP features include connection authentication, encryption, a

Pagina 15

814Encapsulation TypesATM is a popular Layer 2 WAN protocol that establishes data-link layer com-munications over physical Layer 1 circuits. The link

Pagina 16

Book VIIChapter 1Wide-Area Networking Basics815Introducing Cable Connectionspersistent nature of PVC connections allows for a permanent mode of commun

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