652
Appendix A
Practice Exam
17.
Choose the best description of an underrun.
A.
The transmitter runs at a higher rate than the packets sent from the
hardware buffer.
B.
The interface receiver does not receive packets fast enough to
transfer them to the hardware buffer to keep it full.
C.
The hardware buffer can't keep up with the requests from the
output queue.
D.
None of the above.
18.
Where do input and output queues exist, and what are they used for?
A.
Queues reside on each individual interface and are used to avoid
interface congestion.
B.
Queues reside in the CxBus or CyBus and are used to avoid
collisions on the backplane.
C.
Queues reside in RAM and store input and output statistics for all
interfaces.
D.
Queues reside on the RP, and they are used to link the SP buffers
to the RP buffers.
19.
What information determines a "flow" in Netflow switching?
(Choose all that apply.)
A.
Source and destination IP addresses
B.
Source and destination MAC addresses
C.
Protocol
D.
Source and destination ports
E.
Incoming interface
F.
Switching cache used
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