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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

1. DRAG DROP
Drop

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

3. 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 IP phone and the switch
C) between the access layer switch and the distribution layer switch
D) between the IP phone and the PC

4. According to the best practices, which statement is true as related to the QoS policy that should be implemented on the outbound provider (P) to provider (P) router link in a service provider network that is supporting both VoIP and data?

A) In the DiffServ model, ingress and egress QoS mechanisms are only required on the provider edge (PE) routers, so no QoS policy is needed on the P to P link.
B) CBWFQ and CB-WRED should be implemented on the P router egress to provide a maximum bandwidth guarantee for the VoIP traffic.
C) CBWFQ and CB-RTP header compression should be implemented on the P router egress to ensure minimum latency for VoIP traffic.
D) LLQ and CB-WRED should be implemented on the P router egress to support both VoIP and data traffic.

5. For which service is assured forwarding PHB used?

A) best effort
B) class selector
C) expedited forwarding
D) guaranteed bandwidth

Solutions: