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2021 Feb 400-051 ccie collaboration written:

Q111. Refer to the exhibit.

Three calls are active on ephone 1. Assume ephone 2 will remain idle. 

How many additional calls can be placed from ephone 1? 

A. 0 

B. 1 

C. 2 

D. 3 

E. 5 

Answer: C 


Q112. Which SIP request method enables reliability of SIP 1xx response types? 

A. ACK 

B. PRACK 

C. OPTIONS 

D. CANCEL 

E. REGISTER 

Answer: B 


Q113. Refer to the exhibit. 

Assuming this NFAS-enabled T1 PRI configuration on a Cisco IOS router is fully functional, what will the controller T1 1/1 D-channel status be in the output of the show isdn status command? 

A. MULTIPLE_FRAME_ESTABLISHED 

B. TEI_ASSIGNED 

C. AWAITING_ESTABLISHMENT 

D. STANDBY 

E. INITIALIZED 

Answer: B 


Q114. Which element was added to H.225 messages to enable Fast Connect in H.323 version 2? 

A. fastStart 

B. fastConnect 

C. H.245 PDU 

D. User-User Information 

E. Connection Information 

Answer: A 


Q115. How are DTMF digits transported in RFC 2833? 

A. In the RTP stream with the named telephone events payload format. 

B. In the RTP stream with the regular audio payload format. 

C. In SIP NOTIFY messages. 

D. In SIP INFO messages. 

E. In SIP SUBSCRIBE messages. 

Answer: A 


Replace 400-051 ccie collaboration written:

Q116. Which statement describes the Maximum Serving Count service parameter of the Cisco TFTP service on Cisco Unified Communications Manager? 

A. It specifies the maximum number of files in the TFTP server disk storage. 

B. It specifies the maximum number of TFTP client requests to accept and to serve files at a given time. 

C. It specifies the maximum file support by the Cisco TFTP service. 

D. It specifies the maximum file counts, in cache as well as in disk, that are supported by the Cisco TFTP service. 

E. It specifies the maximum number of TFTP client requests to accept and to serve files in a 120-minute window. 

Answer: B 


Q117. Which statement about application inspection of SAF network services on an adaptive security appliance is true? 

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 


Q118. Which two statements about the Peer Firmware Sharing option for IP phone firmware distribution are true? (Choose two.) 

A. This option uses a parent-child hierarchy in which a firmware image is downloaded by a parent phone to up to three directly associated child phones. 

B. This option must be enabled on Cisco Unified Communications Manager service parameters for Cisco TFTP. 

C. This option mandates that the parent phone and child phones be identical, selected phone models. 

D. This option allows firmware transfers between phones in different subnets, as long as the round-trip delay is less than 5 milliseconds. 

E. This option uses a parent-child hierarchy that must be manually defined by the Cisco Unified Communications Manager administrator. 

F. This option allows falling back to the TFTP server in the Cisco Unified Communications Manager cluster. 

Answer: CF 


Q119. Refer to the exhibit. 

You received this debug output to troubleshoot a Cisco IOS MGCP gateway call quality issue at a customer site. Which statement about this message is true? 

A. The MGCP gateway is responding to an RQNT message from Cisco Unified Communications Manager to poll the call statistics of an active call. 

B. The MGCP gateway is responding to an AUEP message from Cisco Unified Communications Manager to poll the call statistics of a terminating call. 

C. The MGCP gateway is responding to an MDCX message from Cisco Unified Communications Manager during a call setup. 

D. The MGCP gateway is responding to an AUCX message from Cisco Unified Communications Manager about an active call. 

E. The MGCP gateway is responding to a DLCX message from Cisco Unified Communications Manager about a terminating call. 

Answer: E 


Q120. What is the minimum number of H.225 messages required to establish an H.323 call with bidirectional media? 

A. 1 

B. 2 

C. 3 

D. 4 

E. 5 

Answer: B