White Papers_Chapin_CCENTReview_d2

CCENT has been created to address the need for providing networking professionals with a solid practicalunderstanding of modern TCP/IP networks built with Cisco hardware, and will certify practical skills requiredfor entry-level network support positions.This certification will serve as the base of Ciscos certification pyramid. It is similar in nature to CompTIAsNetwork+ Certification and represents a tangible first step in earning your CCNA certification.This document is intended to help students gain an understanding of the basic network fundamentals prior toattending our ICND1 – Interconnecting Cisco Network Devices 1 course (and exam 640-822 ICND1) or ourCCNA Boot Camp. This review is...
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White Papers_Chapin_CCENTReview_d2 Course Review Series CCENT Review1-800-COURSES www.globalknowledge.comCCENT ReviewRick Chapin, Global Knowledge InstructorIntroductionCCENT has been created to address the need for providing networking professionals with a solid practicalunderstanding of modern TCP/IP networks built with Cisco hardware, and will certify practical skills requiredfor entry-level network support positions.This certification will serve as the base of Ciscos certification pyramid. It is similar in nature to CompTIAsNetwork+ Certification and represents a tangible first step in earning your CCNA certification.This document is intended to help students gain an understanding of the basic network fundamentals prior toattending our ICND1 – Interconnecting Cisco Network Devices 1 course (and exam 640-822 ICND1) or ourCCNA Boot Camp. This review is intended only as a preview and additional training/knowledge may be neededin order to attend the ICND1 course or the CCNA Boot Camp.Please note: This document is not intended to replace hands-on course work.Table of ContentsCopyright ©2007 Global Knowledge Training LLC. All rights reserved. Page 2OSI Reference Points OSI Layer Upper or Data Network Reference Network Device Flow Layer 7 – Application Upper 6 – Presentation Upper 5 – Session Upper PDU or Message 4 – Transport Data Flow Segment 3 – Network Data Flow Packet or Datagram MultiLayer Switch or Router 2 – Data Link Data Flow Frame Switch or Bridge 1 – Physical Data Flow Bits and Signaling HubOSI Reference Points Remembered: Please Do Not Throw Sausage Pizza Away.OSI LayersOSI Layer Purpose ExamplesApplication Provides services to network applications. • Simple Mail Transport Protocol (SMTP) This layer is responsible for determining • Telnet resource availability, identifying communi- • File Transfer Protocol (FTP) cations peers, and synchronizing communi- • Trivial File Transfer Protocol (TFTP) cations between the applications. • HyperText transfer Protocol (HTTP)Presentation Provides the coding and conversion func- • ASCII (text) tions that are applied to the data to/from • EBCDIC (text) the Application layer. This layer ensures • JPEG (image) that there is a common scheme used to • GIF (image) bundle the data between the two ends. • TIFF (image) There are various examples and this list is by • MPEG (sound/video) no means complete. Text can be either • Quicktime (sound/video) ASCII or EBCDIC. Images can be JPEG, GIF, or TIFF. Sound can be MPEG or Quicktime.Session Maintains communications sessions • Session Control Protocol (SCP) between upper-layer applications. This • Remote Procedure Call (RPC) from layer is responsible for establishing, main- Unix taining, and terminating such sessions • Zone Information Protocol (ZIP) from AppleTalkTransport Responsible for end-to-end data transmis- • Transmission Control Protocol sion. These communications can be either (TCP) from IP reliable (connection-oriented) or non-reli- • User Datagram Protocol (UDP) able (connectionless). This layer organizes from IP data from various upper layer applications into data streams. The transport layer also handles end-to-end flow control, multiplex- ing, virtual circuit management, and error checking and recovery.Copyright ©2007 Global Knowledge Training LLC. All rights reserved. Page 3OSI Layers continuedNetwork Uses administrator-defined logical address- • Internet Protocol (IP) ing to combine many data flows into an internetwork. This layer allows both con- nection-oriented and connectionless data flows to access the network. The ...