2 Comments on “Which of the following PDUs is used by a connectionless protocol?”

1. RAThomas says:

   May 20, 2015 at 3:28 pm

   Answer D

   From Wikipedia:
   PDUs are relevant in relation to each of the first 4 layers of the OSI model as follows:[2]

   The Layer 1 (Physical Layer) PDU is the bit or, more generally, symbol (can also be seen as “stream”)
   The Layer 2 (Data Link Layer) PDU is the frame
   The Layer 3 (Network Layer) PDU is the packet
   The Layer 4 (Transport Layer) PDU is the segment for TCP, or the datagram for UDP
   The Layer 5-6-7 (Application Layer) PDU is the message

   
   
   
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   1. Test Taker says:

      September 30, 2015 at 3:19 pm

      Agreed, and the key word in this question was “connectionless” which is a term used at the transport layer to differentiate between connection-oriented TCP and connectionless UDP. Thus, datagram.

      
      
      
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