What can PfR passive monitoring mode measure for TCP flows?
A.
only delay
B.
delay and packet loss
C.
delay and reachability
D.
delay, packet loss, and throughput
E.
delay, packet loss, throughput, and reachability
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Passive monitoring metrics include the following:
• Delay: Cisco PfR measures the average delay of TCP flows for a given prefix or traffic class.
Delay is the measurement of the round-trip response time (RTT) between the transmission of a
TCP synchronization message and receipt of the TCP acknowledgement.
• Packet loss: Cisco PfR measures packet loss by tracking TCP sequence numbers for each TCP
flow; it tracks the highest TCP sequence number. If it receives a subsequent packet with a lower
sequence number, PfR increments the packet-loss counter. Packet loss is measured in packets
per million.
• Reachability: Cisco PfR measures reachability by tracking TCP synchronization messages that
have been sent repeatedly without receiving a TCP acknowledgement.
• Throughput: Cisco PfR measures TCP throughput by measuring the total number of bytes and
packets for each interesting traffic class or prefix for a given interval of time.
Reference. http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/performancerouting-
pfr/product_data_sheet0900aecd806c4ee4.html
QUESTION NO: 496
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