Get all latest (August) Cisco 640-461 Actual Test 81-90

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QUESTION 81

An engineer is troubleshooting call quality issues between central headquarters and a remote branch location. When on an active call, the engineer watches the call statistics on the IP phone and notices that the max jitter is 100 ms. What is the maximum amount of jitter that the engineer should set to maintain a high- quality call?

 

A.

5 ms

B.

50 ms

C.

10 ms

D.

30 ms

 

Correct Answer: D

 

 

QUESTION 82

Which description describes the weighted fair queuing algorithm?

 

A.

Empty queue 1. If queue 1 is empty, empty queue 2, then empty queue 3, unless a packet for a higher queue arrives.

B.

An administrator defines the traffic classes based on match criteria, including protocols, access control lists, and input interfaces.

C.

A flow-based algorithm that simultaneously schedules interactive traffic to the front of a queue to reduce response time and fairly shares the remaining bandwidth among high- bandwidth flows.

D.

This feature brings strict priority queuing to CBWFQ.

E.

Packets are placed into a single queue and serviced in the order they were received.

 

Correct Answer: C

Explanation:

WFQ allocates an equal share of the bandwidth to each flow. Flow-based WFQ is also called fair queueing because all flows are equally weighted.

http://www.cisco.com/en/US/docs/ios/12_0/qos/configuration/guide/qcwfq.html

 

 

QUESTION 83

What is a benefit of using FRF.12 in a Frame Relay network?

 

A.

provides a Layer 3 mechanism for reducing latency in the network

B.

fragments packets into equal sizes to reduce fixed-network delay

C.

reduces delay and jitter by expediting the transfer of smaller frames through the hardware transmit queue

D.

eliminates the need for prioritization of delay-sensitive traffic

 

Correct Answer: C

 

 

QUESTION 84

Which issue does CAS signaling on a T1 circuit create?

 

A.

Signaling bits are subtracted from each frame, which causes a significant loss of voice quality.

B.

An extra signaling bit is added to the sixth frame to carry signaling information.

C.

A signaling bit is subtracted from every sixth frame to carry signaling information.

D.

Signaling bits are added to the signaling stream to create extended super frames.

 

Correct Answer: C

Explanation:

Each T1 channel carries a sequence of frames. These frames consist of 192 bits and an additional bit designated as the framing bit, for a total of 193 bits per frame. Super Frame (SF) groups twelve of these 193 bit frames together and designates the framing bits of the even numbered frames as signaling bits. CAS looks specifically at every sixth frame for the timeslot’s or channel’s associated signaling information.

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800e2560.shtml

 

 

QUESTION 85

Which generating QoS reports CAR tool, what two parameters are valid for report generation? (Choose two)

 

A.

route lists

B.

route patterns/hunt pilots

C.

route groups

D.

gateway types

E.

partitions

F.

IP phone directory numbers

 

Correct Answer: BD

 

 

QUESTION 86

What is the accepted maximum limit for good-quality voice connection delay?

 

A.

100 ms

B.

200 ms

C.

250 ms

D.

300 ms

 

Correct Answer: C

 

 

QUESTION 87

Which three characteristics are associated with voice? (Choose three.)

 

A.

greedy

B.

TCP retransmits

C.

UDP priority

D.

delay sensitive

E.

drop insensitive

F.

benign

G.

benign or greedy

 

Correct Answer: CDF

 

 

QUESTION 88

Which command is useful to see if network layer information is being received at a PSTN gateway?

 

A.

show gateway status

B.

show isdn q931

C.

show ccm-manager status

D.

show isdn status

E.

show isdn q921

 

Correct Answer: D

 

 

QUESTION 89

Which action must be taken for Cisco Unified Personal Communicator clients to access Cisco Unity Connection voice mail?

 

A.

Cisco Unity Connection must be integrated with LDAP.

B.

Cisco Unity Connection must be integrated with Cisco Unified Communications Manager using SIP integration.

C.

A Microsoft Exchange mailbox store must be configured in Cisco Unified Presence.

D.

IMAP must be enabled on Cisco Unity Connection for users that need to access voice mail through Cisco Unified Personal Communicator clients.

E.

Voice mail is automatically enabled for users who log in through Cisco Unified Personal Communicator clients.

 

Correct Answer: D

Explanation:

http://www.cisco.com/en/US/docs/voice_ip_comm/cups/8_0/english/install_upgrade/deploy ment/guide/dgappendixB.html

 

 

QUESTION 90

Refer to the exhibit. What protocol is being used to send and receive instant messaging between the Cisco Unified Personal Communicator and Cisco Unified Presence?

 

clip_image002

 

A.

Enterprise Instant Messaging Protocol

B.

Extensible Messaging and Presence Protocol

C.

SIP

D.

SCCP

E.

CTI

 

Correct Answer: B

< p class="MsoNormal" style="cursor: auto; margin: 0cm 0cm 0pt; line-height: normal; text-autospace: ; mso-layout-grid-align: none" align="left">Explanation:

Cisco Unified Presence consists of many components that enhance the value of a Cisco Unified Communications system. The main presence component of the solution is the Cisco Unified Presence server, which incorporates the Jabber Extensible Communications Platform and supports SIP/SIMPLE and Extensible Messaging and Presence Protocol (XMPP) for collecting information regarding a user’s availability status and communications capabilities

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/presence.html

 

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