Download New Latest (May) Cisco 642-437 Actual Tests 81-90

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QUESTION 81  (Topic 1)

 

What are the three acceptable values for one-way delay, jitter, and packet loss in a VoIP network? (Choose three.)

 

A.

0-400 ms for delay

B.

1 packet loss

C.

20 ms for jitter

D.

0-150 ms for delay

E.

1 percent packet loss

F.

30 ms for jitter

 

Answer: DEF

Explanation:(http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoSI ntro.html#wp46447)

 

 

QUESTION 82  (Topic 1)

 

What are two benefits of using the DiffServ model? (Choose two.)

 

A.

DiffServ is a flow-based architecture.

B.

DiffServ is highly scalable.

C.

DiffServ keeps flow state on each node in the network.

D.

DiffServ supports a large number of service classes.

E.

DiffServ uses repetitive signaling for each flow.

 

Answer: BD

 

 

QUESTION 83  (Topic 1)

 

Which QoS mechanism for VoIP works with weighted fair queuing (WFQ) and class-based weighted fair queuing (CBWFQ)?

 

A.

Header compression

B.

FRF.12

C.

IP RTP Priority and Frame Relay IP RTP Priority

D.

Multilink PPP

E.

RSVP

 

Answer: C

 

 

QUESTION 84  (Topic 1)

 

An access layer switch is configured to extend priority to an IP phone. Cisco Discovery Protocol is enabled on all ports. What are the three possible ways that an IP phone can be instructed to treat the Layer 2 CoS priority value of the attached PC? (Choose three.)

 

A.

trusted IEEE 802.1Q

B.

configured DSCP level< /p>

C.

configured CoS level

D.

trusted

E.

configured IEEE 802.1Q

F.

untrusted

 

Answer: CDF

 

 

 

Topic 2, Volume B

 

 

QUESTION 85  (Topic 2)

 

Which address type would Session Initiation Protocol address user@cisco.com classify

 

 

as?

 

A.

E.164

B.

mixed format

C.

username at a fully qualified domain name

D.

email

 

Answer: C

 

 

QUESTION 86  (Topic 2)

 

What is the maximum percentage of packet loss that can be accepted on VoIP traffic?

 

A.

less than 5%

B.

0

C.

less than 2%

D.

less than 1%

 

Answer: D

 

 

QUESTION 87  (Topic 2)

 

Which path-selection strategy can be used to avoid expensive public switched telephone network calls when an exis
ting network (IP) link exists between sites?

 

A.

toll-bypass

B.

explicit preference

C.

site-code dialing

D.

Tail-End Hop-Off

 

Answer: A

 

 

QUESTION 88  (Topic 2)

 

When a Session Initiation Protocol user agent client initiates a call to another user agent server, what is the first message type that is sent to the Cisco SIP Proxy Server?

 

A.

invite

B.

trying

C.

initiate

D.

setup

 

Answer: A

 

 

QUESTION 89  (Topic 2)

 

Which proprietary voice client-server protocol sends traffic back to Cisco Unified Communications Manager with every digit pressed on the endpoint?

 

A.

H.323 Protocol

B.

Media Gateway Control Protocol

C.

Session Initiation Protocol

D.

Skinny Client Control Protocol

 

Answer: D

 

 

QUESTION 90  (Topic 2)

 

Which version of Cisco Unified Communications Manager Express is recommended that is supported on endpoints running Cisco IOS 15.0(1)M?

 

A.

8

B.

7

C.

7.1

D.

8.5

 

Answer: C

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