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

By James Jones, Sheldon Barry

Replace to the top-selling Cisco certification ebook within the sequence! The CCNA examination is the 1st and most crucial of the Cisco tests, serving as a prerequisite for a number of greater point Cisco assessments. in line with Cisco insiders, call for for this examination has elevated dramatically within the final 12 months. Written through the best-selling writer of A+ examination Cram, who's additionally Cisco qualified. beneficial properties the Cram Sheet for that final minute assessment.

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Extra resources for CCNA Exam Cram™ 2 (Exams 640-821, 640-811, 640-801)

Sample text

Be prepared to explain why the OSI model was developed, recognize the layers by number and name, and lastly be able to list the major functions or services provided at each layer. Remember that you are expected to answer questions "the Cisco way," so use terms as presented here, which in all likelihood may be slightly different than the way you learned the model. [ Team LiB ] [ Team LiB ] Part I: Introduction to Cisco Technology (Exam 640-821) 33 34 Part I: Introduction to Cisco Technology (Exam 640-821) The OSI Model in Operation There are four general rules that control the operation of the OSI model: 1.

Sounds simple right? Well, if the plot thickened in the previous paragraph, this is where it coagulates into an ugly goo! People in the industry (including the fine folks at Cisco) cannot agree on how to properly describe encapsulation in the OSI model. " We have seen test questions approach encapsulation both ways. Of course, current Cisco instructional material, at least the material we have seen, clarifies the matter by ignoring the issue completely. So, what should you do on the test? Well, everybody agrees that encapsulation occurs at Layers 5, 4, 3, 2, and 1.

So, a situation where two or more signals ended up on the bus at the same time would be highly unlikely. In actual operation, having multiple signals on the bus can and does occur. Two or more interfaces, sensing zero voltage, could, in fact, transmit at the same time causing a collision on the bus. In fact, the stations did not necessarily have to transmit at exactly the same time. A signal takes time to move from one end of the bus to the other, so it is quite possible a station on one end would transmit, not knowing there was already a signal on the other end of the bus.

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