1. Implementing Quality of Service (QoS)
Module 4 Lesson 7 Review

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Question 1
From the following list, identify the valid match command which can be issued in class-map configuration mode:
match all
match output-interface ethernet 0/0
match protocol telnet
match access-list 101
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Question 1 - Answer
From the following list, identify the valid match command which can be issued in class-map configuration mode:
match all
match output-interface ethernet 0/0
match protocol telnet
match access-list 101
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4. Copyright © 2010 Internetwork Expert, Inc
Question 2
A best practice for QoS configuration is to classify traffic as close to the source as possible. Traffic classification can be performed using which two of the following approaches? (Choose 2)
Classification based on the amount of time a packet has been waiting in a queue
Classification using Network Based Application Recognition (NBAR)
Classification using access control lists (ACLs)
Classification based on a tunnel encapsulation type
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Question 2 - Answer
A best practice for QoS configuration is to classify traffic as close to the source as possible. Traffic classification can be performed using which two of the following approaches? (Choose 2)
Classification based on the amount of time a packet has been waiting in a queue
Classification using Network Based Application Recognition (NBAR)
Classification using access control lists (ACLs)
Classification based on a tunnel encapsulation type
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Question 3
When sending traffic across a service provider network, using BGP as the exterior gateway routing protocol, the service provider can use BGP attributes (e.g. a community string or an autonomous system path) to cause edge routers to mark traffic with IP Precedence or QoS group values. Identify this QoS mechanism.
CEF
QBBP
MIB
Pre-Classify
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Question 3 - Answer
When sending traffic across a service provider network, using BGP as the exterior gateway routing protocol, the service provider can use BGP attributes (e.g. a community string or an autonomous system path) to cause edge routers to mark traffic with IP Precedence or QoS group values. Identify this QoS mechanism.
CEF
QBBP
MIB
Pre-Classify
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Question 4
A user’s PC is connected to the PC port of a Cisco IP Phone. The Cisco IP Phone is then connected into a Cisco Catalyst 2950 switch interface, FastEthernet 0/2. While you do not want to trust CoS markings coming from the PC, you do want the PC’s traffic marked with a CoS value of 2. Which of the following interface configuration mode command will cause the PC’s frames to be marked with a CoS of 2?
switchport extended trust cos 2
switchport priority trust cos 2
switchport trust extend cos 2
switchport priority extend cos 2
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Question 4 - Answer
A user’s PC is connected to the PC port of a Cisco IP Phone. The Cisco IP Phone is then connected into a Cisco Catalyst 2950 switch interface, FastEthernet 0/2. While you do not want to trust CoS markings coming from the PC, you do want the PC’s traffic marked with a CoS value of 2. Which of the following interface configuration mode command will cause the PC’s frames to be marked with a CoS of 2?
switchport extended trust cos 2
switchport priority trust cos 2
switchport trust extend cos 2
switchport priority extend cos 2
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Question 5
You are configuring a Cisco Catalyst 2950 switch port to trust CoS markings if, and only if, the marking originated from a Cisco IP Phone. In an attempt to perform this configuration, you enter the mls qos trust device cisco-phone command. However, your configuration does not seem to be working properly. Why is the switch not trusting CoS markings coming from an attached Cisco IP Phone?
A Cisco Catalyst 3550 switch supports the mls qos trust device cisco-phone command, but the Cisco Catalyst 2950 does not support this command.
The mls qos trust cos command is missing.
The mls qos trust extend command is missing.
The mls qos cos 5 command is missing.
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Question 5 - Answer
You are configuring a Cisco Catalyst 2950 switch port to trust CoS markings if, and only if, the marking originated from a Cisco IP Phone. In an attempt to perform this configuration, you enter the mls qos trust device cisco-phone command. However, your configuration does not seem to be working properly. Why is the switch not trusting CoS markings coming from an attached Cisco IP Phone?
A Cisco Catalyst 3550 switch supports the mls qos trust device cisco-phone command, but the Cisco Catalyst 2950 does not support this command.
The mls qos trust cos command is missing.
The mls qos trust extend command is missing.
The mls qos cos 5 command is missing.
Copyright © 2010 Internetwork Expert, Inc