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IP Communications Quality of Service (QoS) : 642-642 Exam

Exam Number/Code: 642-642
Exam Name: IP Communications Quality of Service (QoS)
VUE Code: 642-642
Questions Type: Single choice,
Real Exam Question Numbers: 45-55 questions
Exam Language(s): English

“IP Communications Quality of Service (QoS)”, also known as 642-642 exam, is a Cisco certification.
Preparing for the 642-642 exam Searching 642-642 Test Questions, 642-642 Exam, 642-642 Dumps

With the complete collection of questions and answers Q&as with Expert Explanations, Pass4sure has assembled to take you through 90 Q&As to your 642-642 Exam preparation. In the 642-642 exam resources, you will cover every field and category in IP Communications helping to ready you for your successful Cisco Certification

The QOS exam is one of the qualifying exams for the Cisco Certified Internetwork Professional, Cisco Certified Voice Professional, Cisco IP Telephony Design Specialist, Cisco IP Telephony Express Specialist, Cisco IP Telephony Operations Specialist, and Cisco IP Telephony Support Specialist certifications. The QOS 642-642 exam will test materials covered under the Implementing Cisco Quality of Service QOS v2.1 course. The exam will certify that the successful candidate has knowledge and skills necessary to configure and troubleshoot Cisco IOS routers running Quality of Service protocols in Service Provider and Enterprise environments. The exam covers topics on IP QOS, classification and marking Mechanisms, queuing mechanisms, traffic shaping and policing mechanisms, congestion avoidance mechanisms, link efficiency mechanisms, modular QOS

QUESTION 21:
Which of the following tasks are necessary when configuring Service Assurance
Agent (SAA agent)? (Choose all that apply.)
A. You must schedule the operation
B. You must configure the data collection frequency
C. You must configure the operation type
D. You must configure a collection probe on the router
E. You must configure timer parameters for the SAA agent
Answer: A, C
Explanation:
To configure a new SAA operation, perform the following steps, beginning in in
global configuration mode:
Step 1 Enter RTR configuration mode using the rtr op-numbercommand. The
op-numberargument specifies an identification number for the operation you will be
configuring.
Step 2 Use one of the type commands to specify which type of operation you are
configuring.
Step 3 (Optional) Configure characteristics for the operation, one characteristic per line,
using the commands found in “Configuring SAA Operation Characteristics” section.
Step 4 Type exit to return to global configuration mode.
Step 5 (Optional) Set reaction conditions for the operation, as explained in the “Reaction
Thresholds” section.
Step 6 Schedule the operation start-time, as explained in the “Scheduling the Operation”
section.
Reference:

http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_configuration_guide_chapter09186a00

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QUESTION 22:
The SSA agent is used to measure which of the following SLA metrics? (Choose all
that apply.)
A. jitter
B. interface utilization
C. packet loss
D. response time
E. client response
F. router buffer allocation
Answer: A, C, D
Explanation:
The SAA allows you to measure and monitor the following:
SLA metrics such as round-trip response time and availability.
Voice-over-IP (VoIP) metrics such as jitter, packet loss, and availability of synthetic
VoIP traffic.
Web metrics and applications.
Quality of Service (QoS) and accuracy metrics such as IP packet precedence levels.
Reference:

http://www.cisco.com/en/US/products/sw/iosswrel/ps1830/products_feature_guide09186a0080087a78.html

QUESTION 23:
Which of the following is part of SMS? (Choose all that apply.)
A. QDM
B. CiscoWorks2000 Resource Manager Essentials
C. RSVP COPS Server
D. Service Level Manager
E. CiscoViewCiscoWorks 2000 Management Server
F. All of the above
Answer: B, D, E
Explanation:
SMS includes two main components. First, the Service Level Manager (SLM) is software
that runs on the same host as CiscoWorks2000. SLM provides information to the end
user of SMS, and generates the configuration of the probes based on end-user input. SMS
collection Managers (CMs) are software agents that run on computers spread around the
network for scaling purposes, or a CM can reside on the SLM server for small
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installations.
Reference: Cisco Press – DQOS Exam Certification Guide p.667
QUESTION 24:
You are using IP to ATM CoS. Which action can be configured to be automatically
taken should a VC in a VC bundle fail?
A. The VC can be remapped to a different bundle.
B. The VC can be declared down and an alternate route requested.
C. The circuit data can be transferred or “bumped” to a lower priority VC.
D. The circuit data can be divided equally between the remaining VCs in the bundle.
Answer: C
Explanation:
In the event of failure, the router responds with one of two methods. The first method
dynamically assigns the traffic bound on the failed VC to an alternative VC, which is
termed circuit bumping. Bumped traffic is then shared on an existing in-service VC.
Traffic typically would be bumped from a higher class to a lower one, although it does
not have to be. For example, should the premium, or first class, data circuit become
unavailable, then all premium users would share the second class or general circuit.
Preference would then be given to the premium traffic within this shared circuit.
Reference:

http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_configuration_guide_chapter09186a00800

c
QUESTION 25:
How is IP to ATM CoS supported in a single VC?
A. The IP Precedence bits are mapped into the unused upper bits of the VPI field.
They are treated accordingly as they are switched through the ATM network.
B. The router at the edge of the ATM network sets the ATM CLP based on the IP
Precedence bits.
Lower priority packets are transported in lower priority cells.
They are treated accordingly as they are switched through the ATM network.
C. WRED/DWRED is used in the routers at the edge of the ATM network.
Based on the IP Precedence bits, IP traffic is subjected to different drop probabilities (and
therefore priorities) as IP traffic coming into a router competes for bandwidth on the
ATM VC.
D. PQ-WFQ is used in the routers at the edge of the ATM network.
Based on the IP Precedence bits, IP traffic is then properly queued and de-queued as IP
traffic competes for bandwidth on the ATM VC.
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Answer: C