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Exam
: Cisco 642-642
Title
: Quality of Service (QOS)
Version : Demo
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1. Which of the following markers can be set by Committed Access Rate (CAR)? (Choose all that
apply.)
A. DSCP bits
B. QoS Group
C. ATM CLP bit
D. Frame Relay DE bit
E. IP precedence bits
Answer: ABE
2. What makes the DiffServ model more scalable than the IntServ model? (Choose all that apply.)
A. DiffServ makes use of per-aggregate QoS instead of per-flow QoS.
B. DiffServ makes use of hop-by-hop signaling which allows DiffServ to scale to a larger number of
application flows.
C. DiffServ is capable of implementing admission control either locally on the routers or be
offloaded to a central policy server using the COPS protocol.
D. DiffServ routers are not compelled to track the state information for each individual flow.
Answer: AD
3. The newly appointed Certkiller trainee technician wants to know what the benefits of using traffic
shaping to implement network rate limiting is.What will your reply be? (Choose all that apply.)
A. Traffic shaping is an effective tool for rate-limiting VoIP traffic.
B. It will not increase packet loss.
C. It will not add to packet transit delays.
D. Traffic shaping can interact with congestion mechanisms embedded in Frame Relay.
E. Traffic shaping can be used on inbound and outbound traffic on a router.
Answer: BD
4. Study the Exhibit below carefully: Router# show interfaces hssi 0/0/0 rate-limit Hssi0/0/0
45Mbps to R1 Input matches: all traffic params: 20000000 bps, 24000 limit, 24000 extended limit
conformed 8 packets, 428 bytes; action: transmit exceed 0 packets, 0 bytes; action: drop last
packet: 8680ms ago, current burst: 0 bytes last cleared 00:03:59 ago, conformed 0 bps, exceed 0
bps Output matches: all traffic params: 20000000 bps, 24000 limit, 24000 extended limit
conformed 0 packets, 0 bytes; action: transmit