Accessing the WAN CCNA Exploration Companion Guide by Bob Vachon

By Bob Vachon

Accessing the WAN

CCNA Exploration spouse Guide


Bob Vachon

Rick Graziani


Accessing the WAN, CCNA Exploration better half Guide is the respectable supplemental textbook for the gaining access to the WAN direction within the Cisco Networking Academy CCNA Exploration curriculum model four. This direction discusses the WAN applied sciences and community prone required by way of converged functions in company networks. The spouse advisor, written and edited through Networking Academy teachers, is designed as a transportable table connection with use each time, wherever. The book’s good points make stronger the fabric within the direction that will help you specialise in very important techniques and arrange your examine time for checks.


New and stronger positive aspects assist you research and reach this course:

  • Chapter targets: overview center ideas by way of answering the focal point questions indexed first and foremost of every bankruptcy.
  • Key phrases: consult with the up to date lists of networking vocabulary brought and switch to the highlighted phrases in context in every one bankruptcy.
  • Glossary: seek advice the all-new entire word list with greater than 250 terms.
  • Check Your knowing questions and resolution key: evaluation your readiness with the up to date end-of-chapter questions that fit the fashion of questions you notice at the on-line path quizzes. the reply key explains every one answer.
  • Challenge questions and actions: attempt to ace tougher overview questions and actions designed to organize you for the complicated varieties of questions you may see at the CCNA examination. the reply key explains each one answer.


Bob Vachon is the coordinator of the pc structures expertise software and teaches networking infrastructure classes at Cambrian collage in Sudbury, Ontario, Canada. Bob has labored and taught within the machine networking and data expertise box for 25 years and is a student graduate of Cambrian College. 


Rick Graziani teaches machine technological know-how and laptop networking classes at Cabrillo university in Aptos, California. Rick has labored and taught within the desktop networking and data know-how box for 30 years.


How To: search for this icon to check the stairs it's essential discover ways to practice yes tasks.


Packet Tracer actions: discover networking suggestions in actions interspersed all through a few chapters utilizing

Packet Tracer v4.1 constructed by means of Cisco. The records for those actions are at the accompanying CD-ROM.


Also on hand for the having access to the WAN Course

Accessing the WAN,

CCNA Exploration

Labs and examine consultant

ISBN-10: 1-58713-201-X

ISBN-13: 978-1-58713-201-8


Companion CD-ROM

The CD-ROM offers many beneficial instruments and knowledge to help your education:

Packet Tracer job workout files

  • A advisor to utilizing a Networker’s magazine booklet
  • Taking Notes: A .txt dossier of the bankruptcy pursuits
  • More IT profession Information
  • Tips on Lifelong studying in Networking


This booklet is a part of the Cisco Networking Academy sequence from Cisco Press. the goods during this sequence help and supplement the Cisco Networking Academy on-line curriculum.

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Extra resources for Accessing the WAN CCNA Exploration Companion Guide

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A VPN is an encrypted connection between private networks over a public network such as the Internet. Instead of using a dedicated Layer 2 connection such as a leased line, a VPN uses virtual connections called VPN tunnels, which are routed through the Internet from the company’s private network to the remote site or employee host. VPN Benefits Benefits of VPN include the following: ■ Cost savings: VPNs enable organizations to use the global Internet to connect remote offices and remote users to the main corporate site, thus eliminating expensive dedicated WAN links and modem banks.

Figure 1-18 Circuit Switching Dialing B … A Ringing… B The internal path taken by the circuit between exchanges is shared by a number of conversations. Time-division multiplexing (TDM) gives each conversation a share of the connection in turn. TDM ensures that a fixed-capacity connection is made available to the subscriber. qxp 3/31/08 3:33 PM Page 27 Chapter 1: Introduction to WANs 27 If the circuit carries computer data, the usage of this fixed capacity may be inefficient. For example, if the circuit is used to access the Internet, a burst of activity occurs on the circuit while a web page is transferred.

Several types of WAN encapsulation formats exist, including subsets and proprietary versions of HDLC. Both PPP and the Cisco version of HDLC have an extra field in the header to identify the network layer protocol of the encapsulated data. qxp 26 3/31/08 3:33 PM Page 26 Accessing the WAN, CCNA Exploration Companion Guide WAN Switching Concepts WAN switched networks are categorized as either circuit-switched or packet-switched, as described in greater detail in the following sections. Circuit Switching A circuit-switched network is one that establishes a dedicated circuit (or channel) between nodes and terminals before the users may communicate.

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