Download e-book for kindle: 31 Days Before Your CCNA Exam: A day-by-day review guide for by Allan Johnson

By Allan Johnson

ISBN-10: 1587131978

ISBN-13: 9781587131974

I admire this ebook! It encompasses a pullout 31 day calendar within the entrance, with a number of subject matters according to day for examine. contained in the publication isn't a number of questions ( so do not count on this to be simply one other run of the mill perform exame publication ), the writer presents an encapsulated overview on every one subject, via EXAMPLES of the way to do what used to be simply reviewed. *It's a 31-day, simply readable, condensed completely, textbook! (The excellent better half in 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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Extra resources for 31 Days Before Your CCNA Exam: A day-by-day review guide for the CCNA 640-802 exam (2nd Edition)

Sample text

We will also review basic troubleshooting methodologies. The TCP/IP Application Layer The application layer of the TCP/IP model provides an interface between software, like a web browser, and the network itself. The process of requesting and receiving a web page works like this: 1. HTTP request sent including an instruction to “get” a file—which is often a website’s home page. 2. HTTP response sent from the web server with a code in the header—usually either 200 (request succeeded and information is returned in response) or 404 (page not found).

SEQ is the sequence number. In bold are SYN and ACK, which each represent a 1-bit flag in the TCP header used to signal connection establishment. TCP initializes the Sequence Number and Acknowledgment Number fields to any number that fits into the 4-byte fields. After data transfer is complete, a four-way termination sequence occurs that uses an additional flag, called the FIN bit, as shown in Figure 29-5. Figure 29-5 TCP Connection Termination ACK , FIN SEQ =10 PC 00 01 =10 ACK K 01 AC =10 ACK 70 N , FI =14 ACK SEQ ACK ACK = 147 1 PC 26 31 Days Before Your CCNA Exam UDP TCP establishes and terminates connections between endpoints, whereas UDP does not.

TCP Header TCP provides error recovery, but to do so, it consumes more bandwidth and uses more processing cycles than UDP. TCP and UDP relies on IP for end-to-end delivery. TCP is concerned with providing services to the applications of the sending and receiving computers. To provide all these services, TCP uses a variety of fields in its header. Figure 29-1 shows the fields of the TCP header. Day 29 Figure 29-1 23 TCP Header Fields Bit 15 Bit 0 Source Port (16) Bit 16 Bit 31 Destination Port (16) Sequence Number (32) Acknowledgement Number (32) Header Length (4) Reserved (6) Code Bits (6) Checksum (16) 20 Bytes Window (16) Urgent (16) Options (0 or 32 If Any) Data (Varies) Port Numbers The first two fields of the TCP header—source and destination ports—are also part of the UDP header shown later in Figure 29-6.

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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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