Which of the following PDUs is used by a connectionless protocol?
A.
Frames
B.
Segments
C.
Streams
D.
Datagram
Explanation:
Which of the following PDUs is used by a connectionless protocol?
Which of the following PDUs is used by a connectionless protocol?
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
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.