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Home Cisco® 300-820

Cisco® 300-820 Exam Practice Questions (P. 1)

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Question #1
Which complication does a NAT introduce in SDP for a SIP call?
  1. A
    Additional headers due to NAT encapsulation can cause the packet size to exceed the MTU.
  2. B
    When the client is behind a NAT they may be unable to determine the appropriate offset due to time zones.
  3. C
    The IP address specified in the connection data field may be an unrouteable internal address.
  4. D
    The encryption keys advertised in the SDP are only valid for clients not behind a NAT.

Correct Answer:
D

Question #2
A company already has a Cisco Unified Communications Manager for internal audio and video traffic, but it requires video communication with external partners and customers. It is important to ensure security for the deployment and the connectivity.
What must be set up to enable this requirement?
  1. A
    Cisco Unified Border Element and Cisco ASA Firewall
  2. B
    Cisco Unified Border Element and Cisco Firepower Firewall
  3. C
    Cisco Expressway-C and Cisco Expressway-E
  4. D
    Cisco Expressway-C and Cisco Unified Border Element

Correct Answer:
C

Question #3
When an Expressway-E is configured for static NAT, which Session Description Protocol attribute is modified to reflect the NAT address?
  1. A
    SDP b-line
  2. B
    SIP record route
  3. C
    SDP c-line
  4. D
    SDP m-line

Correct Answer:
C

Question #4
A company is installing Cisco Collaboration infrastructure and one of the requirements is that they must be able to communicate with many external parties that are using H.323 and SIP. Internally they want to register the endpoints only on SIP.
Which functionality would describe the feature that needs to be enabled and where to achieve this?
  1. A
    Interworking in Expressway-C
  2. B
    Transcoding in Cisco Unified Communications Manager
  3. C
    Transcoding in Expressway-C
  4. D
    Interworking in Cisco Unified Communications Manager

Correct Answer:
B

Question #5
What is a key configuration requirement for Hybrid Message Service High Availability deployment with multiple IM and Presence clusters?
  1. A
    You must have the Intercluster Sync Agent working across your IM and Presence clusters.
  2. B
    You must have the Intercluster Lookup Service working across all of your IM and Presence clusters.
  3. C
    Your IM and Presence Service clusters must have Multiple Device Messaging disabled.
  4. D
    AXL service should be activated only on the publisher of each IM and Presence cluster.

Correct Answer:
A

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