31 Days Before Your CCNA Exam: A day-by-day review guide for by Allan Johnson PDF

By Allan Johnson

ISBN-10: 1587131978

ISBN-13: 9781587131974

I like this ebook! It incorporates a pullout 31 day calendar within the entrance, with a number of subject matters according to day for learn. contained in the e-book isn't really a number of questions ( so do not anticipate this to be simply one other run of the mill perform exame e-book ), the writer presents an encapsulated evaluation on each one subject, by means of EXAMPLES of ways to do what used to be simply reviewed. *It's a 31-day, simply readable, condensed completely, textbook! (The excellent better half on your CCNA perform examination books)

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Read or Download 31 Days Before Your CCNA Exam: A day-by-day review guide for the CCNA 640-802 exam (2nd Edition) PDF

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Additional resources for 31 Days Before Your CCNA Exam: A day-by-day review guide for the CCNA 640-802 exam (2nd Edition)

Example text

Web client sends an HTTP request for a specific web server down to the transport layer. 2. TCP encapsulates the HTTP request with a TCP header. 3. Lower layers process and send the request to the web server. 4. Web server receives HTTP requests and sends a TCP acknowledgement back to the request- ing web client. 5. Web server sends the HTTP response down to the transport layer. 6. TCP encapsulates the HTTP data with a TCP header. 7. Lower layers process and send the response to the requesting web client.

6. Intermediary devices process the bits at the network access and Internet layers, and then for- ward the data toward the destination. 7. Web server receives the bits on the physical interface and sends up through the network access and Internet layers. 8. Web server sends a TCP acknowledgement back to the requesting web client. 9. Web server sends the HTTP response down to the transport layer. 10. TCP encapsulates the HTTP data. 11. IP encapsulates the transport segment into a packet, adding source and destination addresses.

Figure 29-3 TCP Acknowledgment With Errors Web Browser Web Server 1000 Bytes of Data, Sequence = 1000 1000 Bytes of Data, Sequence = 2000 He never got the segment with sequence number = 2000, resend it. 1000 Bytes of Data, Sequence = 3000 No Data, Acknowledgment = 2000 I never received segment 2000. ACK the one that is missing! 1000 Bytes of Data, Sequence = 2000 No Data, Acknowledgment = 4000 I Just Got 2000-2999, and I Already Had 3000-3999. Ask for 4000 Next. Although not shown, the web server also sets a retransmission timer, awaiting acknowledgment, just in case the acknowledgment is lost or all transmitted segments are lost.

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31 Days Before Your CCNA Exam: A day-by-day review guide for the CCNA 640-802 exam (2nd Edition) by Allan Johnson


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