TAILIEUCHUNG - CompTIA Network+ Certification Study Guide part 39

CompTIA’s Network+ certification Study Guide part 39 is a globally-recognized, vendor neutral exam that has helped over 235,000 IT professionals reach further and higher in their careers. The 2009 Network+ exam (N10-004) is a major update with more focus on security and wireless aspects of networking. Our new study guide has been updated accordingly with focus on network, systems, and WAN security and complete coverage of today’s wireless networking standards. | 366 CHAPTER 8 Wide Area Networking today and still must be supported. Many companies and other institutions using Frame Relay have no need at this time to upgrade their networks and will continue to use Frame Relay until they do need to migrate to another technology. In any case much like Frame Relay is becoming a less frequently used technology. Frame Relay is still covered directly as an objective in the 2009 Network exam. MPLS MPLS is a new WAN technology that is becoming very popular because of its many benefits including its pure Layer 3 design and the fact that it is IP-based. Furthermore MPLS allows you to label data to have a specific priority based on the application type. The quality of service QoS mechanisms in MPLS are quite sophisticated. MPLS is able to use labels to mark packets as they come in and out of the MPLS network. When the packets enter the MPLS network fabric it is quickly routed to its destination based on its label and what that label specifies. MPLS operates at Layer 3 of the OSI model and is an excellent choice for voice and video applications. RFC 3031 .org rfcs shows many fine details on the inner workings of the technology and how MPLS operates. At one time was a popular standard for packet-switching networks but new installations are few and far between these days. Heavily used at one time it is now slowly fading away. is a WAN protocol that operates at Layers 1 2 and 3 of the OSI model. is very versatile designed to operate in almost any environment. It was not as fast as other technologies but added a very robust error-checking mechanism that virtually guaranteed error-free delivery of data. When network communications were carried on much poorer network media than we enjoy today this was a very important protocol for WAN transmission. You can see an example of an WAN in Figure . Although is a fading technology and not used very often anymore the terminology that stems .

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