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C is incorrect; the network layer provides logical addressing so that routers can perform route determination. C is incorrect; the transport layer provides delivery of the data and error correction prior to retransmit.
E is incorrect; the session layer is responsible for establishing, managing, and terminating communications sessions between presentation layer entities.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages
Q. 13
A packet is the protocol data unit for which layer of the OSI model?
A.Data link
B.Session
C.Presentation
D.Network
E.Transport
Answer: D
Explanation:
The packet is the encapsulation type of the Network layer.
Incorrect Answers:
A is incorrect, the data unit of the data link layer is the frame.
B is incorrect; the session layer in not involved in the data encapsulation process.
C is incorrect; the presentation layer ensures that the receiving system can read the data and is not involved in encasulation.
E is incorrect; the transport layer data unit is the segment.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages
Q. 14
What is the result of segmenting a network with a bridge?
A.It increases the number of collision domains.
B.It decreases the number of collision domains.
C.It increases the number of broadcast domains.
D.It decreases the number of broadcast domains.
Answer: A.
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