By Mike Harwood
Awareness community+ applicants: cease spending beneficial research time sorting via complicated examine aids. community + examination Prep 2 is the last word self-study advisor for the community + examination. that includes routines, self-assessments, learn concepts, examination guidance and notes, this finished consultant might help you realize the suggestions at the back of the examination ambitions and rating higher at the attempt. additionally, you will obtain a CD that comes with over a hundred perform try out questions and the Cram Sheet tear card for last-minute try out overview. community + examination Prep 2 is the smarter, extra effective approach to get qualified.
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Additional info for Network+ Exam Prep 2
Gigabit Ethernet has the same general characteristics. 10 summarizes the characteristics of Gigabit Ethernet. 10. 3z Topology Star Access method CSMA/CD Media Twisted-pair cable, fiber-optic cable Speed 1Gbps NOTE 100VG-AnyLAN As mentioned earlier in this chapter, the 100VG-AnyLAN standard is based on the Ethernet standard but uses the demand priority access method instead of CSMA/CD. The 100VG-AnyLAN standard defines a physical star networking system over twisted-pair or fiber-optic cable at 100Mbps.
This eliminates the possibility of collisions and so provides for very high access speeds and controlled media access. Demand priority lets the administrator assign a priority to requests for media access. If there is contention for media access, the link with the highest priority wins, making the demand priority system good for time-sensitive applications. Networks that use demand priority require specialized network devices to manage access. Thus demand priority implementations are more expensive than alternatives such as CSMA/CD.
An example of a WAN. [View full size image] WANs often use different technologies from LANs. " 40 Part I: Exam Preparation Part I: Exam Preparation 41 EXAM ALERT LAN/WAN Technologies An understanding of the technologies used in both LANs and WANs is required for the Network+ test. These technologies are covered in detail throughout the rest of this book. NOTE When Does a LAN Become a WAN? Technically, a LAN never becomes a WAN. If the definitions of LAN and WAN were taken literally and applied to a working model that had three connected sites, the portions of the network confined within each site would be LANs, and the network elements connecting the sites together would be called the WAN.