Download CCNA Exam Cram™ 2 (Exams 640-821, 640-811, 640-801) by James Jones, Sheldon Barry PDF

By James Jones, Sheldon Barry

Replace to the top-selling Cisco certification publication within the sequence! The CCNA examination is the 1st and most vital of the Cisco tests, serving as a prerequisite for a number of better point Cisco tests. in keeping with Cisco insiders, call for for this examination has elevated dramatically within the final yr. Written by way of the best-selling writer of A+ examination Cram, who's additionally Cisco qualified. gains the Cram Sheet for that final minute assessment.

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The switch, however, only read the source and destination address from the beginning of the frame. So only the first few bytes of the frame would need to survive a collision to be passed on to another segment. This did not become a problem until the segment approached saturation. As the number of collisions rose, the switch would begin passing a significant number of damaged frames. In essence, the switch was creating a different collision domain every time it set up a virtual circuit and those collision domains were changing so fast it was almost impossible to diagnose.

Of course, the coaxial cable was replaced by traces on a printed circuit board, but the functionality of the bus was still there. " The advent of the hub and 10BASE-T wiring eliminated most of the problems inherent in a coaxial cable based bus network. The hub cabinetry protected the physical bus, taps, and repeaters, eliminating damage from nicks, cuts, and leaky tap connections. The difficult job of tapping into the bus was performed and tested at the factory, which allowed field connections to be as simple as snapping a Category 5 connector into the jack on the hub.

Network Sales and Services Handbook. Cisco Press, Indianapolis, Indiana, 2003. ISBN 1-58705-090-0. This book is a lot like getting the time without the dissertation on how to make a watch. It is perfect for the CCNA exams. [ Team LiB ] [ Team LiB ] Chapter 3. Hardware and the OSI Model Terms you'll need to understand • Hub • Bridge • Layer 2 switch • Router Part I: Introduction to Cisco Technology (Exam 640-821) 39 40 Part I: Introduction to Cisco Technology (Exam 640-821) • Layer 3 switch • Repeater • Star topology • Bus topology • Coaxial cable • Twisted pair • Collision domain • Segment • CSMA/CD Techniques you'll need to master: • Ethernet operation • Store and forward bridging • Network segmentation • Strengths and weaknesses of a star topology versus a bus topology • Identify hardware typical of Layers 1 through 3 of the OSI model • Understand the functions of and differences of bridges and Layer 2 switches • Understand the operational differences and functions of Layer 1, 2, and 3 devices When IBM released its first PC it started a veritable buying frenzy among corporations.

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