300-820 practice questions 1–10

1. Question 1 · 177 in bank

   What is a key configuration requirement for Hybrid Message Service High Availability deployment with multiple IM and Presence clusters?

   • AYou must have the Intercluster Sync Agent working across your IM and Presence clusters.
   • BYou must have the Intercluster Lookup Service working across all of your IM and Presence clusters.
   • CYour IM and Presence Service clusters must have Multiple Device Messaging disabled.
   • DAXL service should be activated only on the publisher of each IM and Presence cluster.

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   Answer: A

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2. Question 2 · 177 in bank

   Which complication does a NAT introduce in SDP for a SIP call?

   • AAdditional headers due to NAT encapsulation can cause the packet size to exceed the MTU.
   • BWhen the client is behind a NAT they may be unable to determine the appropriate offset due to time zones.
   • CThe IP address specified in the connection data field may be an unrouteable internal address.
   • DThe encryption keys advertised in the SDP are only valid for clients not behind a NAT.

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   Answer: C

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3. Question 3 · 177 in bank

   When an Expressway-E is configured for static NAT, which Session Description Protocol attribute is modified to reflect the NAT address?

   • ASDP b-line
   • BSIP record route
   • CSDP c-line
   • DSDP m-line

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   Answer: C

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4. Question 4 · 177 in bank

   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?

   • AInterworking in Expressway-C
   • BTranscoding in Cisco Unified Communications Manager
   • CTranscoding in Expressway-C
   • DInterworking in Cisco Unified Communications Manager

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   Answer: A

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5. Question 5 · 177 in bank

   Cisco Collaboration endpoints are exchanging encrypted signaling messages. What is one major complication in implementing NAT ALG for voice and video devices?

   • AInternal endpoints cannot use addresses from the private address space.
   • BThe NAT ALG cannot inspect the contents of encrypted signaling messages.
   • CNAT ALG introduces jitter in the voice path.
   • DSource addresses cannot provide the destination addresses that remote endpoints should use for return packets.

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   Answer: B

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6. Question 6 · 177 in bank

   Which media encryption mode can be configured on an Expressway zone?

   • AAdvanced Encryption Standard
   • BIPsec
   • CTriple Data Encryption Standard
   • Dforce unencrypted

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   Answer: D

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7. Question 7 · 177 in bank

   What is the purpose of a transform in the Expressway server?

   • AA transform has the function as a neighbor zone in the Expressway. It creates a connection with another server.
   • BA transform changes the audio codec when the call goes through the Expressway.
   • CA transform is used to route calls to a destination.
   • DA transform changes an alias that matches certain criteria into another alias.

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   Answer: D

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8. Question 8 · 177 in bank

   Select 2

   What are two reasons why port 8443 is unreachable from the Internet to the Expressway-E? (Choose two.)

   • AThe MRA license is missing on the Expressway-E.
   • BThe Unified Communications zone is down.
   • CTransform is not configured on Expressway-E.
   • DThe SRV record for _cisco-uds is misconfigured.
   • EThe firewall is blocking the port.

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   Answer: BE

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9. Question 9 · 177 in bank

   Select 2

   An organization with a domain name of example.com. Which two SRV records are valid for a SIP and H.323 communication? (Choose two.)

   • A_sips._tcp.example.com
   • B_sips._udp.example.com
   • C_h323ls._udp.example com
   • D_h323ls._tcp.example.com
   • E_collab-edge._tls.example.com

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   Answer: AC

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10. Question 10 · 177 in bank

    What is the Cisco-recommended key length in bits for a Cisco Expressway certificate?

    • A1024
    • B2048
    • C4096
    • D8192

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    Answer: C

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300-820 practice, question 1. 177 questions available.