[Free] 2017(Apr) Ensurepass Passguide Cisco 400-051 Latest Dumps 191-200

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CCIE Collaboration Written Exam

QUESTION 191

Which Cisco packet voice and video digital signal processor 3 can be used for video mixing on a Cisco Integrated Router Generation 2?

 

A.

PVDM3-16

B.

PVDM3-32

C.

PVDM3-64

D.

PVDM3-128

 

Correct Answer: D

Explanation:

All the PVDM3 types (that is, PVDM3-16, PVDM3-32, PVDM3-64, PVDM3-128, PVDM3-192, and PVDM3-256) support switched-only video conferences. Only PVDM3-128 and higher modules support video conferencing with video mixing, transcoding and transrating.

 

Reference:

http://www.cisco.com/c/en/us/products/collateral/unified-communications/voice-video-conferencing-isr-routers/data_sheet_c78-649427.pdf

QUESTION 192

Refer to the exhibit. Which ds0-group option should you select to support automated number identification information collection on inbound calls for this digital T1 voice circuit?

 

clip_image002

 

A.

e&m-wink-start

B.

e&m-delay-dial

C.

e&m-delay-dial

D.

e&m-lmr

E.

e&m-fgd

 

Correct Answer: E

Explanation:

Because it can receive ANI information and sends DNIS info. But can’t send ANI.

 

Reference:

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/isdn/configuration/15-mt/vi-15-mt-book/vi-imp-t1cas-voip.html

 

 

QUESTION 193

How are queues serviced in Cisco IOS routers with the CBWFQ algorithm?

 

A.

first-in, first-out

B.

weighted round robin based on assigned bandwidth

C.

strict priority based on assigned priority

D.

last-in, first-out

E.

weighted round robin based on assigned priority

 

Correct Answer: B

Explanation:

Class Based Weighted Fair queuing is an advanced form of WFQ that supports user defined traffic classes i.e. one can define traffic classes based on match criteria like protocols, access control lists (ACLs), and input interfaces. A flow satisfying the match criteria for a class contributes the traffic for that particular defined class. A queue is allocated for each class, and the traffic belonging to that class is directed to the queue for that class.

 

 

 

 

QUESTION 194

Assume 18 bytes for the Layer 2 header and a 10-millisecond voice payload, how much bandwidth should be allocated to the strict priority queue for three VoIP calls that use a G.722 codec over an Ethernet network?

 

A.

331.2 kb/s

B.

347.8 kb/s

C.

261.6 kb/s

D.

274.7 kb/s

E.

238.4 kb/s

 

Correct Answer: A

Explanation:

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml

 

 

QUESTION 195

Assume a 30-millisecond voice payload, 6 bytes for the Layer 2 header, 1 byte for the end- of-frame flag, and the IP, UDP, and RTP headers are compressed to 2 bytes, how much bandwidth should be allocated to the strict priority queue for eight VoIP calls that use a G.729 codec over a multilink PPP link with cRTP enabled?

 

A.

121.6 kb/s

B.

92.8 kb/s

C.

88.4 kb/s

D.

83.2 kb/s

E.

78.4 kb/s

 

Correct Answer: D

Explanation:

http://www.cisco.com/en/US/tech/t
k652/tk698/technologies_tech_note09186a0080094ae2.shtml

 

 

QUESTION 196

To which Cisco enterprise medianet application class does Cisco TelePresence belong?

 

A.

VoIP Telephony

B.

Real-time Interactive

C.

Multimedia Conferencing

D.

Broadcast Video

E.

Low Latency Data

 

Correct Answer: B

Explanation:

Telepresence is used for video conferencing which can be done in Real-time so it is Real- time Interactive.

 

 

QUESTION 197

Refer to the exhibit. Assume that the serial interface link bandwidth is full T1. What is the bandwidth that is guaranteed for voice signaling traffic with a DSCP value of CS3?

 

clip_image003

 

A.

33 percent of 1.544 Mb/s

B.

5 percent of 1.544 Mb/s

C.

38 percent of 1.544 Mb/s

D.

62 percent of 1.544 Mb/s

E.

0 percent of 1.544 Mb/s

 

Correct Answer: B

Explanation:

Under the policy map VOIP the CS3 value falls under the signal class-map, which has been allocated 5 percent of the bandwidth.

 

 

QUESTION 198

Which two security services are provided by the Phone Proxy function on a Cisco ASA appliance? (Choose two.)

 

A.

It provides interworking to ensure that external IP phone traffic is encrypted, as long as the Cisco Unified Communications Manager cluster runs in secure mode.

B.

It only applies to encrypted voice calls where both parties utilize encryption.

C.

It manipulates the call signaling to ensure that all media is routed via the adaptive security appliance.

D.

It supports encrypted TFTP operation of IP phone configuration files.

E.

It intercepts and authenticates soft clients before they reach Cisco Unified Communications Manager clusters.

F.

It requires a remote routing device with an IPsec VPN tunnel.

 

Correct Answer: CE

Explanation:

When using TLS Proxy, the Cisco ASA appliance is inserted between the phones and Cisco Unified Communications Manager. The phones will now establish a TLS session with the ASA appliance. The appliance will, in turn, establish a proxy TLS connection with Cisco Unified Communications Manager on the phone’s behalf. This function generates two TLS sessions.

 

 

QUESTION 199

The iLBC codec operates at 38 bytes per sample per 20-millisecond interval. What is its codec bit rate in kilobits per second?

 

A.

6.3

B.

13.3

C.

15.2

D.

16

E.

24

 

Correct Answer: C

Explanation:

The internet Low Bit Rate Codec (iLBC) is designed for narrow band speech and results in a payload bit rate of 13.33 kbits per second for 30-millisecond (ms) frames and 15.20 kbits per second for 20 ms frames. When the codec operates at block lengths of 20 ms, it produces 304 bits per block, which is packetized as defined in RFC 3952. Similarly, for block lengths of 30 ms it produces 400 bits per block, which is packetized as defined in RFC 3952.The iLBC has built-in error correction functionality to provide better performance in networks with higher packet loss.

 

 

QUESTION 200

Which statement describes the Cisco best practice recommendation about priority queue bandwidth allocation in relationship to the total link bandwidth when multiple strict priority LLQs are configured on the same router interface?

 

A.

Each LLQ should be limited to one-third of the link bandwidth capacity.

B.

The sum of all LLQs should be limited to two-thirds of the link bandwidth capacity.

C.

The sum of all LLQs should be limited to one-half of the link bandwidth capacity.

D.

The sum of all LLQs should be limited to one-third of the link bandwidth capacity.

E.

Cisco does not recommend more than one strict priority LLQ per interface.

 

Correct Answer: D

Explanation:

Cisco Technical Marketing testing has shown a significant decrease in data application response times when Real-Time traffic exceeds one-third of a link’s bandwidth capacity. Cisco IOS Software allows the abstraction (and, thus, configuration) of multiple LLQs. Extensive testing and production-network customer deployments have shown that limiting the sum of all LLQs to 33 percent is a conservative and safe design ratio for merging real- time applications with data applications.

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