By Bob Vachon
Getting access to the WAN CCNA Exploration spouse consultant Bob Vachon Rick Graziani gaining access to the WAN, CCNA Exploration better half consultant is the respectable supplemental textbook for the getting access to the WAN direction within the Cisco Networking Academy CCNA Exploration curriculum model four. This path discusses the WAN applied sciences and community prone required via converged functions in firm networks. The spouse consultant, written and edited by means of Networking Academy teachers, is designed as a transportable table connection with use each time, anyplace. The book’s positive aspects strengthen the fabric within the path that will help you concentrate on vital thoughts and set up your research time for checks. New and stronger beneficial properties assist you examine and reach this path: bankruptcy goals: overview center techniques via answering the point of interest questions indexed at first of every bankruptcy. key words: check with the up to date lists of networking vocabulary brought and switch to the highlighted phrases in context in each one bankruptcy. thesaurus: seek advice the all-new accomplished thesaurus with greater than 250 phrases. money Your figuring out questions and resolution key: assessment your readiness with the up to date end-of-chapter questions that fit the fashion of questions you spot at the on-line path quizzes. the reply key explains each one resolution. problem questions and actions: try to ace more difficult overview questions and actions designed to organize you for the complicated varieties of questions you could see at the CCNA examination. the reply key explains each one solution. Bob Vachon is the coordinator of the pc platforms know-how software and teaches networking infrastructure classes at Cambrian university in Sudbury, Ontario, Canada. Bob has labored and taught within the machine networking and knowledge know-how box for 25 years and is a student graduate of Cambrian College. Rick Graziani teaches laptop technological know-how and laptop networking classes at Cabrillo university in Aptos, California. Rick has labored and taught within the laptop networking and data expertise box for 30 years. tips to: search for this icon to check the stairs you'll want to discover ways to practice convinced projects. Packet Tracer actions: discover networking techniques in actions interspersed all through a few chapters utilizing Packet Tracer v4.1 built by way of Cisco. The documents for those actions are at the accompanying CD-ROM. additionally on hand for the having access to the WAN direction getting access to the WAN, CCNA Exploration Labs and research consultant ISBN-10: 1-58713-201-X ISBN-13: 978-1-58713-201-8 better half CD-ROM The CD-ROM presents many beneficial instruments and knowledge to help your schooling: Packet Tracer job workout records A advisor to utilizing a Networker’s magazine e-book Taking Notes: A .txt dossier of the bankruptcy goals extra IT occupation info pointers on Lifelong studying in Networking This publication is a part of the Cisco Networking Academy sequence from Cisco Press. the goods during this sequence aid and supplement the Cisco Networking Academy on-line curriculum.
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Extra info for Accessing the WAN, CCNA Exploration Companion Guide
Normally this is a dedicated leased line. This line is much shorter than a leased line connected directly between the subscriber locations. In addition, this one line to the POP can carry several VCs, allowing it to provide connections to multiple destinations. Because it is likely that not all the VCs require maximum demand simultaneously, the capacity of the leased line can be smaller than the sum of the individual VCs. 25 ■ Frame Relay ■ ATM WAN Connection Options This section covers various WAN connection options, including private dedicated links, private switched links, and public connection options using the Internet.
Figure 1-6 Hierarchical Network Model Core High-Speed Switching Distribution Access Policy-Based Connectivity Local and Remote Workgroup Access The Hierarchical Network Model As you may recall from CCNA Exploration: LAN Switching and Wireless, the hierarchical network model divides a network into three layers: ■ The access layer grants user access to network devices. In a network campus, the access layer generally incorporates switched LAN devices with ports that provide connectivity to workstations and servers.
In the WAN environment, it may give teleworkers or remote sites access to the corporate network across WAN technology. ■ The distribution layer aggregates the wiring closets, using switches to segment workgroups and isolate network problems in a campus environment. Similarly, the distribution layer aggregates WAN connections at the edge of the campus and provides policy-based connectivity. qxp 12 3/31/08 3:33 PM Page 12 Accessing the WAN, CCNA Exploration Companion Guide ■ The core layer (also called the backbone) is a high-speed backbone that is designed to switch packets as fast as possible.