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D. The application layer must assume responsibility for correct sequencing of the data packets.
Answer: A.
Explanation: One of the benefits of a connection-orientated protocol is that there is a guarantee of delivery of
data. This guarantee is provided as the two communicating exchange PDUs during transmission and if an
acknowledgement is not received then the data is retransmitted. As can be imagined this exchange of PDUs can
cause an increase in overhead.
Incorrect Answers:
B: Sequence numbers are added to insure correct order
C: Packet loss, duplication, and ordering are handled by connection-oriented protocols.
D: The transport layer (such as TCP) handles sequencing.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 29-30.
Q. 232
Enter the command to start IP, RIP version1 routing on a Cisco router?
Answer: Router rip
Explanation: The key characteristics of RIP include: it is a distance vector protocol, hop count is the metric
used for path selection, it maximum allowable hop count is 15, it broadcasts it entire routing table every 30
seconds by default and it can be load balanced as many as six equal cost paths (4 paths are the default). To
configure RIP not only does the router rip command need to be inputted but also it must be followed by the
network command. The network command must be issued for each directly connected network.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 278-9.
Q. 233
Which two statements about the store and forward switching method are true? (Choose two)
A. Latency remains constant regardless of frame size.
B. Latency through the switch varies with frame length.
C. The switch receives the complete frame before beginning to forward it.
D. The switch checks the destination address as soon as it receives the header and begins forwarding the
frame immediately.
Answer B, C.
Explanation: