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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 11-12.
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 11-13.
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.