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2016 Oct 400-051 Study Guide Questions:

Q1. 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: CE 

Q2. 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 

Q3. When a Cisco IOS gatekeeper receives an ARQ from a registered endpoint, what is the first step it will take in an attempt to resolve the destination address? 

A. Check to see if the destination address is locally registered. 

B. Check to see if the destination address matches the technology prefix. 

C. Check to see if the destination address matches the local zone prefix. 

D. Check to see if the destination address matches the remote zone prefix. 

E. Check to see if the destination address matches the default technology prefix. 

Answer: B 

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Q4. Which message is used by a Cisco IOS MGCP gateway to send periodic keepalives to its call agent? 

A. CRCX 

B. AUCX 

C. NTFY 

D. RQNT 

E. 200 OK 

Answer: C 

Q5. Refer to the exhibit. 

During a QSIG tunneling over SIP call establishment, which two types of SIP messages can the OGW use to tunnel a waiting QSIG message? (Choose two.) 

A. SIP re-INVITE 

B. SIP NOTIFY 

C. SIP INFO 

D. SIP OPTIONS 

E. SIP UPDATE 

F. SIP REFER 

Answer: AE 

Q6. The number of calls waiting in a Cisco Unified Communications Manager native call queue has reached its maximum limit. 

Which statement about what happens to additional incoming calls is true? 

A. Calls are handled according to the Forward Hunt Busy settings on the Hunt Pilot configuration page. 

B. Calls are handled according to the Forward Hunt No Answer settings on the Hunt Pilot configuration page. 

C. Calls are handled according to the Forward Hunt Busy settings on the Line Group members. 

D. Calls are handled according to the Hunt Options settings on the Line Group Configuration page. 

E. Calls are handled according to the When Queue Is Full settings on the Hunt Pilot Configuration page. 

Answer: E 

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Q7. 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 

Q8. Refer to the exhibit. 

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 

Q9. Which four attributes are needed to determine the time to complete a TFTP file transfer process? (Choose four.) 

A. file size 

B. file type 

C. network interface type 

D. round-trip time 

E. packet loss percentage 

F. response timeout 

G. network throughput 

Answer: ADEF 

Q10. When a Cisco IOS gatekeeper receives an LRQ, what is the first step it will take in an attempt to resolve the destination address? 

A. Check to see if the LRQ reject-unknown-prefix flag is set. 

B. Check to see if the destination address matches the technology prefix. 

C. Check to see if the destination address matches the hop-off technology prefix. 

D. Check to see if the destination address matches the remote zone prefix. 

E. Check to see if the LRQ forward-queries flag is set. 

Answer: B 

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