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Home Cisco® 400-051

Cisco® 400-051 Exam Practice Questions (P. 3)

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Question #21
Which two SCCP call signaling messages are sent by an IP phone to Cisco Unified Communications Manager? (Choose two.)
  1. A
    SoftKeyEvent
  2. B
    OpenReceiveChannelAck
  3. C
    StartMediaTransmission
  4. D
    SelectSoftKeys
  5. E
    CloseReceiveChannel
  6. F
    StopTone

Correct Answer:
AB
This message indicates which soft key was pressed. Upon receipt of this message, CallManager invokes the action associated with the pressed soft key. For example, if Hold was the pressed soft key, CallManager places the active call on user hold. In some trace files you might see a soft key number without the corresponding description. The following list defines each soft key number.

Question #22
Which device is the initiator of a StationInit message in a Cisco Unified Communications Manager SDI trace?
  1. A
    Cisco Unified Communications Manager
  2. B
    MGCP gateway
  3. C
    Cisco Music on Hold server
  4. D
    SCCP IP phone
  5. E
    SIP Proxy Server

Correct Answer:
D
Station Init means that an inbound Transmission Control Protocol (TCP) message from a Skinny station reached CallManager. A Skinny station is any endpoint that uses the Skinny protocol to communicate with CallManager.

Question #23
Refer to the exhibit.


You received this debug output to troubleshoot a Cisco IOS MGCP gateway problem at a customer site. Which statement about this endpoint on the Cisco MGCP gateway is true?
  1. A
    This endpoint is on a T1 Controller 0/1/0.
  2. B
    This endpoint is on an E1 Controller 0/1/0.
  3. C
    This endpoint is on a T1 Controller 0/1/1.
  4. D
    This endpoint is on an E1 Controller 0/1/2.
  5. E
    This endpoint is on an T1 Controller 0/1/2.

Correct Answer:
A
The s0/Su1/DS1-0 refers to the slot and port information (0/1/0). It is also a DS1 as shown by this output, which means it is a T1 not an E1.

Question #24
To which SIP response class do the SIP response codes 300 to 399 belong?
  1. A
    Provisional
  2. B
    Client Failure
  3. C
    Server Failure
  4. D
    Successful
  5. E
    Redirection

Correct Answer:
E
Redirection further action needs to be taken in order to complete the request. That is what this class implies.

Question #25
Which SIP request method enables reliability of SIP 1xx response types?
  1. A
    ACK
  2. B
    PRACK
  3. C
    OPTIONS
  4. D
    CANCEL
  5. E
    REGISTER

Correct Answer:
B
In order to achieve reliability for provisional responses, we do nearly the same thing. Reliable provisional responses are retransmitted by the TU with an exponentialbackoff. Those retransmissions cease when a PRACK message is received. The PRACK request plays the same role as ACK, but for provisional responses. There is an important difference, however. PRACK is a normal SIP message, like BYE. As such, its own

Question #26
Which SIP response is considered a final response?
  1. A
    183 Session in Progress
  2. B
    199 Early Dialog Terminated
  3. C
    200 OK
  4. D
    180 Ringing
  5. E
    100 Trying

Correct Answer:
C
200 OK Indicates the request was successful. Whether other options state the request is still in progress or request is initiated.

Question #27
Which two SDP content headers can be found in a SIP INVITE message? (Choose two.)
  1. A
    Expires
  2. B
    Contact
  3. C
    Connection Info
  4. D
    Media Attributes
  5. E
    Allow
  6. F
    CSeq

Correct Answer:
CD
Connection info is optional field in SDP whether Media attributes decide the codec and media type for that call.

Question #28
Refer to the exhibit.


If this SIP call is initiated using early offer, which SIP message will UA#2 use to communicate its media capability to UA#1?
  1. A
    INVITE
  2. B
    180 Ringing
  3. C
    200 OK
  4. D
    ACK
  5. E
    RTP Media

Correct Answer:
C
In Early offer, SIP Send SDP in the invite, the other node will send the SDP in the 200 message.

Question #29
Refer to the exhibit.


If this SIP call is initiated using delayed offer, which SIP message will UA#1 use to communicate its media capability to UA#2?
  1. A
    INVITE
  2. B
    180 Ringing
  3. C
    200 OK
  4. D
    ACK
  5. E
    RTP Media

Correct Answer:
D
In the Delayed Offer process, the calling does not send its offer in the SIP INVITE Message. The callee sends the offer within the SDP fields of its answer (SIP 200
OK). The calling answers within the ACK message.

Question #30
Which two responses are examples of client error responses in SIP protocol? (Choose two.)
  1. A
    302 Moved Temporarily
  2. B
    404 Not Found
  3. C
    503 Service Unavailable
  4. D
    502 Bad Gateway
  5. E
    604 Does Not Exist Anywhere
  6. F
    408 Request Timeout

Correct Answer:
BF
Client Error (400 to 499)Request contains bad syntax or cannot be fulfilled at this server. This class of 400 to 499 contains only error messages.

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