By Bob Vachon
Gaining access to the WAN CCNA Exploration significant other advisor Bob Vachon Rick Graziani gaining access to the WAN, CCNA Exploration spouse consultant is the reputable supplemental textbook for the gaining access to the WAN path within the Cisco Networking Academy CCNA Exploration curriculum model four. This path discusses the WAN applied sciences and community companies required by means of converged functions in company networks. The significant other consultant, written and edited through Networking Academy teachers, is designed as a conveyable table connection with use each time, at any place. The book’s good points make stronger the cloth within the direction that will help you concentrate on very important recommendations and arrange your examine time for assessments. New and better good points assist you research and achieve this direction: bankruptcy pursuits: overview center innovations by means of answering the point of interest questions indexed initially 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. word list: seek advice the all-new finished thesaurus with greater than 250 phrases. cost Your figuring out questions and resolution key: review 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 solution. problem questions and actions: attempt to ace more difficult evaluate questions and actions designed to arrange you for the advanced forms of questions chances are you'll see at the CCNA examination. the reply key explains each one solution. Bob Vachon is the coordinator of the pc platforms know-how application and teaches networking infrastructure classes at Cambrian university in Sudbury, Ontario, Canada. Bob has labored and taught within the machine networking and data expertise box for 25 years and is a pupil graduate of Cambrian College. Rick Graziani teaches computing device technology and desktop networking classes at Cabrillo university in Aptos, California. Rick has labored and taught within the computing device networking and knowledge know-how box for 30 years. easy methods to: search for this icon to check the stairs it is advisable learn how to practice yes projects. Packet Tracer actions: discover networking techniques in actions interspersed all through a few chapters utilizing Packet Tracer v4.1 constructed by means of Cisco. The documents for those actions are at the accompanying CD-ROM. additionally to be had for the having access to the WAN direction getting access to the WAN, CCNA Exploration Labs and research advisor ISBN-10: 1-58713-201-X ISBN-13: 978-1-58713-201-8 better half CD-ROM The CD-ROM offers many helpful instruments and knowledge to aid your schooling: Packet Tracer task workout documents A advisor to utilizing a Networker’s magazine publication Taking Notes: A .txt dossier of the bankruptcy pursuits extra IT occupation info pointers on Lifelong studying in Networking This ebook 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
Then a frame check sequence (FCS) uses the cyclic redundancy check (CRC) mechanism to establish a 2- or 4-byte field. 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.
The short-leased line to the Frame Relay network edge allows cost-effective connections between widely scattered LANs. Frame Relay is described in more detail in Chapter 3. ATM Figure 1-26 shows an ATM network. Asynchronous Transfer Mode (ATM) technology can transfer voice, video, and data through private and public networks. It is built on a cellbased architecture rather than on a frame-based architecture. ATM cells are always a fixed length of 53 bytes. The ATM cell contains a 5-byte ATM header followed by 48 bytes of ATM payload.
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.