1.3 Sample CCNA exam (OSI and TCP/IP Model)

This sample CCNA exam will review your knowledge about OSI and TCP/IP Model.

Questions :

1. You issue ping command and you get output shows “request times out”. Which OSI layer this problem reside ?
2. Which layer of the OSI model is responsible for ensuring reliable end-to-end delivery of data?
3. At which OSI layer is a logical path created between two host ?
4. The acknowledgement of transmissions, sequencing, and flow control across a network. At which OSI layer ?

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Answers :

1. Network layer
   ICMP is a protocol designed to help manage and control the operation of a TCP/IP network. The ICMP protocol provides a wide variety of information about a network's health and operational status. Ping belong to this ICMP, and ICMP belong to Network layer in OSI layer.
2. Transport layer
   
3. Network layer
   
4. Transport layer