Download New Latest (May) Cisco 400-051 Actual Tests 101-110

By | May 15, 2015

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QUESTION 101  (Topic 5)

 

Refer to the exhibit.

 

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Assume that the serial interface link bandwidth is full T1. What is the maximum amount of bandwidth allowed for priority queuing of RTP packets with a DSCP value of EF?

 

A.

33% of 1.544 Mb/s

B.

5% of 1.544 Mb/s

C.

38% of 1.544 Mb/s

D.

62% of 1.544 Mb/s

E.

0% of 1.544 Mb/s

 

Answer: A

Explanation:Since the use of the “priority” keyword was not used in this example 0% is the correct answer.

 

 

QUESTION 102  (Topic 5)

 

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

 

A.

It is supported only on phones that use SCCP.

B.

It is supported on an adaptive security appliance that runs in transparent mode.

C.

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

D.

It provides a proxy of phone signaling, with optional use of NAT, to hide the Cisco Unified Communications Manager IP address from the public Internet.

E.

It proxies phone media so that internal phones are not directly exposed to the Internet.

F.

It supports IP phones that send phone proxy traffic through a VPN tunnel.

 

Answer: DE

Explanation: TLS Proxy is typically deployed in front of Cisco Unified Communications Manager and other unified communications application servers that utilize media encryption. TLS Proxy is not designed to provide remote-access encryption services for remote phones or client endpoints. Other solutions such as Cisco ASA Phone Proxy or IP Security/Secure Sockets Layer (IPsec/SSL) VPN services are more appropriate. TLS Proxy is not designed to provide a secure campus soft phone solution where the requirement is to provide secure data to phone VLAN traversal or for proxying connections to Cisco Unified Communications Manager.

 

 

QUESTION 103  (Topic 5)

 

Which statement about application inspection of SAF network services on an adaptive security appliance is true?

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A.

The adaptive security appliance can inspect and learn the ephemeral port numbers that are used by H.225 and H.245 on SAF-enabled H.323 trunks.

B.

An explicit ACL must be configured on the adaptive security appliance for SAF-enabled SIP trunks.

C.

An explicit ACL must be configured on the adaptive security appliance for SAF-enabled H.323 trunks to account for ephemeral port numbers that are used by H.225 and H.245.

D.

The adaptive security appliance can inspect and learn the ephemeral port numbers that are used by H.225 on SAF-enabled H.323 trunks, but H.245 ports must be explicitly defined.

E.

The adaptive security appliance provides full application inspection for SAF network services.

 

Answer: C

Explanation:The Adaptive Security Appliances do not have application inspection for the SAF network service. When Unified CM uses a SAF-enabled H.323 trunk to place a call, the ASA cannot inspect the SAF packet to learn the ephemeral port number used in the H.225 signalling. Therefore, in scenarios where call traffic from SAF-enabled H.323 trunks traverses the ASAs, ACLs must be configured on the ASAs to allow this signaling traffic. The ACL configuration must account for all the ports used by the H

.225 and H.245 signaling. Reference: Cisco Collaboration 9.x Solution Reference Network Designs (SRND) page 4- Q104  (Topic 5)

 

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.

 

Answer: C,E

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.

 

Q105  (Topic 5)

 

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

 

Answer: A

Reference:

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

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Q106  (Topic 5)

 

 

Assume 6 bytes for the Layer 2 header, 1 byte for the end-of-frame flag, and a 40- millisecond voice payload, how much bandwidth should be allocated to the strict priority queue for five VoIP calls that use a G.729 codec over a multilink PPP link?

 

 

A.87 kb/s

 

B.134 kb/s

 

C.102.6 kb/s

 

D.77.6 kb/s

 

E.71.3 kb/s

 

Answer: A

Explanation: Voice payloads are encapsulated by RTP, then by UDP, then by IP. A Layer 2 header of the correct format is applied; the type obviously depends on the link technology in use by each router interface: A single voice call generates two one-way RTP/UDP/IP packet streams. UDP provides multiplexing and checksum capability; RTP provides payload identification, timestamps, and sequence numbering.

 

Q107  (Topic 5)

 

Refer to the exhibit.

 

 

 

clip_image001[1]

 

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?

 

 

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

 

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.

 

Q108  (Topic 5)

 

To which Cisco enterprise medianet application class does Cisco Unified Personal Communicator belong?

 

 

 

A.VoIP Telephony

 

B.Real-time Interactive

 

C.Multimedia Conferencing

 

D.Broadcast Video

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E.Low Latency Data

 

Answer: C

Explanation: Cisco Digital Media Suite (DMS) is a comprehensive suite comprised of Cisco Digital Signs, Cisco Cast, and Cisco Show and Share applications that allow companies to use digital media to increase sales, enhance customer experience and facilitate learning in this Cisco Unified Personal Communicator belong to Multimedia Conferencing

 

Q109  (Topic 5)

 

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

 

Answer: B

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

 

Q110  (Topic 5)

 

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.

 

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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