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Cisco Quality of Service (QoS) Sample Questions:

1. Which three statements regarding WRED are true? (Choose three.)

A) WRED can be IP precedence-based or DSCP-based.
B) WRED is used to rate-limit the incoming traffic by metering the incoming traffic rate.
C) WRED is an advanced queuing mechanism.
D) WRED uses a shaping queue to delay excess traffic.
E) ECN is an extension of WRE
F) WRED can be applied to a traffic class using CB-WRED.

2. Which three characteristics are drawbacks to the use of a best-effort with over-provisioning backbone design? (Choose three.)

A) Denial of Service attacks on one service can affect all network traffic.
B) The design costs more to implement than a DiffServ backbone.
C) Unplanned network failures can cause unexpected congestion in the network.
D) It requires complex QoS mechanisms at the network edge.
E) The design uses a different over-provisioning ratio for the different traffic classes.
F) It requires complex QoS mechanisms at the network core.

3. In an unmanaged CE router implementation, how does the service provider enforce the SLA?

A) by using class-based random discard on the CE to PE link to limit the customer's input rate
B) by marking on the CE to PE link and using CBWFQ and CB-WRED on the PE to P link
C) by using class-based policing on the CE to PE link to limit the customer's input rate
D) by marking on the CE to PE link and using class-based policing on the PE to P link

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

5. This policy-map is applied to a 128-kbps serial interface in the output direction. Which set of additional commands within this policy-map will improve the link efficiency on the serial interface?
policy-map test
class voice
priority 25
class telnet
bandwidth remaining percent 20
class ftp
bandwidth remaining percent 30

A) class telnet
compression header ip tcp
B) class telnet
fair-queue
C) class voice
no priority 25
bandwidth percent remaining 25
D) class ftp
compression header ip
E) class ftp
fair-queue
F) class voice
compression header ip tcp

Solutions: