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Cisco Quality of Service (QoS) Sample Questions:

1. A Cisco Catalyst switch has an IP phone connected to its Fastethernet0/2 port. The IP phone has an attached PC. The Fastethernet0/2 port on the switch has been configured with the commands mls qos trust cos, mls qos trust device cisco-phone, and switchport priority extend trust.
What will happen to a data frame with a CoS of 5 that is sent from the PC through the IP phone to port Fastethernet0/2 on the switch?

A) While the packet will pass through the IP phone without modification, the switch will, by default, override theCoS priority with the switch default CoS priority.
B) The switch will instruct the phone to allow the packet through without modification only if the phone has been configured to do so.
C) The IP phone will, by default, overwrite the switch CoS value and mark the data packet asCoS0.
D) The IP phone will allow the data packet through without modifying theCoS settings of the data frame.

2. What are two benefits of WFQ? (Choose two.)

A) Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full.
B) WFQ can provide fixed-bandwidth guarantees.
C) WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size.
D) WFQ can provide fixed-bandwidth and fixed-delay guarantees.
E) WFQ is very easy to configure, and no manual traffic classification is necessary.
F) WFQ can provide fixed-delay guarantees.

3. HOTSPOT

4. Which command is needed to correct the following configurations in order to enable ppp multilink
LFI on the s0/0 interface?
interface Serial0/0
ip address 10.1.1.1 255.255.255.0
encapsulation ppp
no fair-queue
ppp multilink
multilink-group 2001100114
!
interface Multilink2001100114
bandwidth 384
ip address 10.1.1.1 255.255.255.0
service-policy output AutoQoS-Policy-UnTrust
ppp multilink
ppp multilink fragment-delay 10
ppp multilink interleave

A) the ppp multilink interleave command on the s0/0 interface
B) the multilink-group 2001100114 command on the Multilink2001100114 interface
C) the ppp multilink load-threshold command on the s0/0 interface
D) the no ip address command on the s0/0 interface
E) the ppp multilink load-threshold command on the Multilink2001100114 interface

5. What are three reasons link efficiency mechanisms are deployed on WAN links? (Choose three.)

A) increase link speed
B) decrease delay
C) decrease jitter
D) increase throughput
E) decrease propagation delay

Solutions: