OSI 7 Layer

    1 OSI 7 Layer    ( Mr.Watt )       ( Mr.Mast )           ( Mr.Jodoi )                         Network          CCNA , CCNP , LPI , Security + , CWNA      Certificate          OSI 7 Layers                  CCIE      OSI 7   Layers            Network       ( Why Network ? )     1. Why Network ?    Network ?      share data ,                      network.                                                    network               copy  flash drive                                                                         network      Internet   e-mail   file       Share file    Server   software        msn    file                           netwok      Internetwork          network                Internet              network                             OSI 7 Layers            OSI 7 Layers                                     layer               

            OSI   OSI             OSI  Open System Interconnection   7               OSI Model                     OSI model      1.Physical Layer 2.Data Link Layer 3.Network Layer 4.Transport Layer 5.Session Layer 6.Presentation Layer 7.Application Layer

  OSI

7 Layers

     

 Application

 Application

 Presentation

 Presentation

  Session

  Session

  Transport

  Transport

  Network 

  Network 

Data Link 

  Physical

Data Link 

 

Physical

  Layer 1.Physical Layer

           Lan   Connector                   layer  bits   protocol     CAT5, CAT6, RJ-45 cable       CCNA    Lan  UTP   Physical Layer

 Serial

  UTP

 Lan  





  Lan 1.    Lan      -    ( Crossover )  PC   Lan   PC , Router    Lan  Router     -    ( Straight )  PC   Hub  Switch  2.     Lan  Router   PC

C. TCP D. UDP

Answer: B

4. An administrator issues the command ping 127.0.0.1 from the command line prompt on a PC. If  a reply is received, what does this confirm? A. The PC has connectivity with a local host. B. The PC has connectivity with a Layer 3 device. C. The PC has a default gateway correctly configured. D. The PC has connectivity up to Layer 5 of the OSI model. E. The PC has the TCP/IP protocol stack correctly installed.

Answer: E 5. Why does the data communication industry use the layered OSI reference model? (Choose two.) A. It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting. B. It enables equipment from different vendors to use the same electronic components, thus saving research and development funds. C. It supports the evolution of multiple competing standards, and thus provides business opportunities for equipment manufacturers. D. It encourages industry standardization by defining what functions occur at each layer of the model. E. It provides a means by which changes in functionality in one layer require changes in other layers. Answer: AD

6. Acknowledgements, sequencing, and flow control are characteristics of which OSI layer? A. Layer 2 B. Layer 3 C. Layer 4 D. Layer 5 E. Layer 6 F. Layer 7 Answer: C

7. A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame is then discarded. At which OSI layer did this happen? A. session B. transport

C. network  D. data link  E. physical Answer: D 8. Which of the following are associated with the application layer of the OSI model? (Choose two.) A. ping B. Telnet C. FTP D. TCP E. IP Answer: BC 9. While troubleshooting a network connectivity problem, a technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the problem most likely exist? A. the session layer B. the protocol layer C. the data link layer D. the access layer E. the network layer F. the application layer Answer: E

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