New PDF release: Alcatel-Lucent Scalable IP Networks Self-Study Guide:

By Kent Hundley

ISBN-10: 0470529385

ISBN-13: 9780470529386

By means of delivering the recent provider Routing Certification application, Alcatel-Lucent is extending their achieve and data to networking pros with a entire demonstration of the way to construct shrewdpermanent, scalable networks. Serving as a "course in a book" from Alcatel-Lucent—the global chief in designing and constructing scalable systems—this source pinpoints the pitfalls to prevent while development scalable networks, examines the main winning recommendations on hand for engineers who're development and working IP networks, and offers overviews of the net, IP routing and the IP layer, and the perform of commencing the shortest direction first.

Note: CD-ROM/DVD and different supplementary fabrics will not be integrated as a part of e-book dossier.

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Extra resources for Alcatel-Lucent Scalable IP Networks Self-Study Guide: Preparing for the Network Routing Specialist I (NRS 1) Certification Exam (4A0-100)

Example text

These layers may be grouped into two main areas, defined simply as the upper and lower layers. , a UNIX workstation) can execute all seven layers, this is not practical in real networks. The amount of traffic that needs to be moved through modern networks requires purpose-built devices that handle various layer functions. Two such examples are bridges, which are purpose-built for Layer 2 operation; and routers, which are purpose-built for Layer 3 operations. 14 ​The OSI reference model defines seven distinct layers.

This is achieved by providing common addressing to all the physical components. 4 : Overview of TC P / I P 15 6/3/09 7:59:59 PM home address. Each address uniquely identifies a particular house somewhere in the world, and no two addresses are exactly alike. Similarly, the addressing is hierarchical, having a street address, a city, and a country (and a state, if you are in the United States). However, since these addresses are meant to be used solely by machines, they use only numeric addresses.

Another critical point to understand is that the packets are forwarded strictly based on the information in the IP header. None of the routers in the path need to read either the TCP or SMTP headers in order to properly forward the packets. We should note that in some circumstances a router might examine the TCP information in order to forward packets based on the upper layer protocol. For example, a provider might wish to give HTTP traffic priority over SMTP traffic in the event of network congestion.

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Alcatel-Lucent Scalable IP Networks Self-Study Guide: Preparing for the Network Routing Specialist I (NRS 1) Certification Exam (4A0-100) by Kent Hundley

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