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

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 assessments, serving as a prerequisite for a number of larger point Cisco checks. in line with Cisco insiders, call for for this examination has elevated dramatically within the final 12 months. Written by means of the best-selling writer of A+ examination Cram, who's additionally Cisco qualified. positive aspects the Cram Sheet for that final minute overview.

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

Sample text

C. Troubleshooting is easier if a layered model is used by all parties. • D. A layered model reduces the complexity of networking to more manageable sub-layers. A3: Question 4 Answers A, C, and D are correct. Answer B is incorrect because compliance with the OSI model is voluntary. A developer can certainly improve the ease of interoperability by adhering to the OSI model, but in no way is a developer required to use the model. Which of the following are upper layers of the OSI model? ) • A. Layer 4 • B.

32 Part I: Introduction to Cisco Technology (Exam 640-821) Part I: Introduction to Cisco Technology (Exam 640-821) 33 Do not confuse routable protocols with routing protocols, which also operate at Layer 3. Routable protocols such as IP, IPX, and AppleTalk provide a network addressing format and a packet structure that includes a field for the network address in addition to user data. Routing protocols are used by routers to exchange administrative information. Routing protocols do not include user data.

The Frame is then passed to the Physical layer where it is turned into a Bits PDU and finally placed on the network medium. If we have done everything right we will have used five steps of encapsulation, while passing through seven layers, and yes you will need to keep all of this straight for the test. 3 will help. 3. Data flow between network stations. 3 shows the flow of data between two network stations. Five levels of encapsulation imply the PDUs for Layer 6 and Layer 7 would be an "information unit".

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