By Allan Johnson
31 Days sooner than your CCNA examination, moment version, will give you a personable and functional method to comprehend the certification procedure, decide to taking the examination, and end your practise utilizing quite a few Foundational and Supplemental learn assets. The ebook breaks down key examination themes into 31 day-by-day evaluate periods utilizing brief summaries, lists, tables, examples, and photographs. A learn assets part offers you a short reference for finding extra in-depth remedy of a day’s issues in the proper Foundational and Supplemental assets. Use this daily consultant to arrange, organize, and overview all of the CCNA® pursuits. The positive aspects of the publication empower you to slot examination coaching into an another way busy time table: Tear out visible calendar summarizes each one day’s examine subject matters list highlights vital initiatives and points in time major as much as your examination Description of the 640-802 CCNA examination association and check in strategy, contains how one can use a voucher innovations from the writer assist you to be mentally, organizationally, and bodily ready for examination day Conversational tone, making your examine time extra relaxing Allan Johnson entered the tutorial international in 1999 after ten years as a enterprise proprietor and operator. He has a keenness for instructing and holds either an MBA and an M.Ed in occupational education and improvement. Allan presently works complete time constructing CCNA tutorial aid and coaching fabrics. classification: Cisco® Certification $29.99 united states / $32.99 CAN
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Extra info for 31 Days Before Your CCNA Exam: A Day-By-Day Review Guide for the 640-802 Exam, 2nd Edition
Data Encapsulation Summary Each layer of the TCP/IP model adds its own header information. As the data travels down through the layers, it is encapsulated with a new header. At the network access layer, a trailer is also added. This encapsulation process can be described in five steps: Step 1 Create and encapsulate the application data with any required application layer headers. For example, the HTTP OK message can be returned in an HTTP header, followed by part of the contents of a web page. Step 2 Encapsulate the data supplied by the application layer inside a transport layer header.
DNS, Telnet, SMTP, POP3, IMAP, DHCP, HTTP, FTP, SNMP Transport Supports communication between diverse devices across diverse networks. TCP, UDP Internet Determines the best path through the network. IP, ARP, ICMP Network access Controls the hardware devices and media that make up the network. Ethernet, Frame Relay In coming days, we will review these protocols in more detail. For now, a brief description of the main TCP/IP protocols follows: ■ Domain Name System (DNS): Provides the IP address of a website or domain name so a host can connect to it.
Figure 29-6 compares the two headers. Figure 29-6 2 2 Source Port Dest. Port TCP and UDP Headers 4 4 4 bits Sequence Ack. Offset Number Number 6 bits 6 bits 2 2 Reserved Flags Window Size Checksum 2 3 Urgent Options 1 PAD TCP Header 2 2 2 2 Source Port Dest. Port Length Checksum UDP Header * Unless Specified, Lengths Shown Are the Numbers of Bytes The TCP/IP Internet Layer The Internet layer of the TCP/IP model and its Internet Protocol (IP) defines addresses so that each host computer can have a different IP address.