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Cisco Quality of Service (QoS) Sample Questions:

1. When configuring a Cisco Catalyst switch to accommodate an IP phone with an attached PC, it is desired that the trust boundary be set between the IP phone and the switch. Which two commands on the switch are recommended to set the trust boundary as described? (Choose two.)

A) mls qos trust device cisco-phone
B) mls qos cos 5
C) switchport priority extend trust
D) no mls qos trust dscp
E) mls qos trust cos
F) mls qos trust extend [cos value]

2. Refer to the partial router configuration. Which two of the following statements are true? (Choose two.)

A) The configuration is invalid since it refers to a class map within a different class.
B) Only those packets which satisfy all of the matches in class1 and class2 will be subject to policing.
C) Any IP packet will be subject to policing.
D) All traffic from a server with the IP address of 147.23.54.21 will be subject to policing.
E) Regardless of destination IP address, all traffic sent to Mac address 1.2.3 will be subject to policing
F) The class-map class1 command will set the qos-group value to 4 for all IP packets.

3. Which QoS mechanism adds IP Precedence information for prefixes into the FIB table?

A) Class-Based WRED
B) QoS pre-classify
C) QPPB
D) AutoQoS
E) LLQ
F) Class-Based Marking

4. Based on the following show output, which statement is true?
WG1S1#sh mls qos interface fa0/1 FastEthernet0/1 trust state: not trusted trust mode: trust cos COS override: dis default COS: 0 pass-through: none trust device: cisco-phone

A) All incoming CoS markings are trusted.
B) A Cisco IP Phone is not connected to the fa0/1 switch port.
C) All incoming DSCP markings are trusted.
D) DSCP markings from the Cisco IP Phone are trusted.

5. Switch port fa0/2 has been configured to connect an IP phone with an attached PC. Given the set of commands shown below, where does the trust boundary lie?
interface fa0/2 mls qos trust cos mls qos trust device cisco-phone switchport voice vlan 112

A) between the PC port and the LAN port on the IP phone
B) between the access layer switch and the distribution layer switch
C) between the IP phone and the PC
D) between the IP phone and the switch

Solutions: