Cisco CCNP Collaboration 300-820 Questions & Answers

• Question 71:

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

  A. You must have the Intercluster Sync Agent working across your IM and Presence clusters.

  B. You must have the Intercluster Lookup Service working across all of your IM and Presence clusters.

  C. Your IM and Presence Service clusters must have Multiple Device Messaging disabled.

  D. AXL service should be activated only on the publisher of each IM and Presence cluster.

  Correct Answer: A

• Question 72:

  Which two statements about Cisco Webex Video Mesh Nodes are true? (Choose two.)

  A. When Expressway Core works with VMN clusters, Expressway Core decides which VMN is used for signaling/media connection.

  B. Cloud-registered devices choose a VMN cluster based on the lowest STUN round trip delay.

  C. The cascading traffic between VMN must bypass the firewall.

  D. When Cisco Unified Communications Manager works with multiple VMNs, Cisco Unified CM decides which VMN is used for signaling connection.

  E. A VMN can terminate a media connection while operating in maintenance mode.

  Correct Answer: BD

• Question 73:

  Refer to the exhibit. The administrator attempted to log in, but Jabber clients cannot log in via mobile and remote access. How is this issue resolved?

  

  A. Skype for Business mode must be disabled on the DNS server because it conflicts with Jabber login requirements.

  B. The domain pod1.local must be deprovisioned from the Webex cloud for Jabber logins.

  C. A DNS SRV record must be created for _collab-edge._tls.pod1.local that points to the Expressway-E.

  D. The username [email protected] is invalid. The user should instead sign-in simply as jabberuser.

  Correct Answer: C

• Question 74:

  Refer to the exhibit.

  

  An ISDN gateway is registered to Expressway-C with a prefix of 9 and/or it has a neighbor zone specified that routes calls starting with a 9. Which value should be entered into the "Source" field to prevent toll fraud regardless at origin of the call?

  A. Traversal Zone

  B. Any

  C. Neighbor Zone

  D. All

  Correct Answer: B

  The dropdown options for the Source field are:

  1.

  Any

  2.

  All zones

  3.

  Local Zone

  4.

  Named

  https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X8-8/Cisco-Expressway-Basic-Configuration-Deployment-Guide-X8-8.pdf

• Question 75:

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

  A. Additional headers due to NAT encapsulation can cause the packet size to exceed the MTU.

  B. When the client is behind a NAT they may be unable to determine the appropriate offset due to time zones.

  C. The IP address specified in the connection data field may be an unrouteable internal address.

  D. The encryption keys advertised in the SDP are only valid for clients not behind a NAT.

  Correct Answer: C

  The problem is that if NAT enabled, some firewalls doesn't write the translated address into the SIP Signalling (fortinet for example has VIP feature that make it works).

• Question 76:

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

  A. SDP b-line

  B. SIP record route

  C. SDP c-line

  D. SDP m-line

  Correct Answer: C

  as c-line shows the connection information, Media IP address. So if it is natted it will be reflected there.

• Question 77:

  Which two types of information does Cisco Expressway back up? (Choose two.)

  A. call records

  B. log files

  C. IP addresses

  D. current call states

  E. security certificates

  Correct Answer: AE

  The data saved to a backup file includes:

  Bootstrap key (from X8.11)

  System configuration settings

  Clustering configuration

  Local authentication data (but not Active Directory credentials for remotely managed accounts)

  User account and password details

  Server security certificate and private key

  Call detail records (if the CDR service on Expressway is enabled)

  Reference:

  https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X8-10/Mobile-Remote-Access-via-Expressway-Deployment-Guide-X8-10.pdf

• Question 78:

  An engineer is deploying an Expressway solution for the SIP domain Cisco.com. Which SRV record should be configured in the public DNS to support inbound B2B calls?

  A. _collab-edge._tls.cisco.com

  B. _cisco-uds._tcp.cisco.com

  C. _sip._tcp.cisco.com

  D. _cuplogin._tcp.cisco.com

  Correct Answer: C

  SIP B2B - Cisco SRV Records for business-to-business _sips._tcp.domain 5061 TLS _sip._tcp.domain 5060 TCP _sip._udp.domain 5060 UDP

  Reference: https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2018/pdf/BRKCOL-2018.pdf

• Question 79:

  A Cisco Webex Hybrid Video Mesh Node can be installed in the DMZ and on the internal network.

  Which statement is true?

  A. Webex Cloud supports either a DMZ-based Mesh Node for security or an internal-based Mesh Node for media control only.

  B. Installing a Video Mesh Node in the DMZ requires you to open TCP and UDP port 4444 in your internal firewall for full clustering functionality.

  C. Installing a Video Mesh Node in the DMZ requires the external firewall to allow UDP traffic from ANY port to the address of the Video Mesh Nodes via port 5004.

  D. Using internal Video Mesh Node also works due to Mobile and Remote Access setup for Webex Teams clients. A DMZ node is added for extra security.

  Correct Answer: C

• Question 80:

  Refer to the exhibit.

  

  Calls to locally registered endpoints are failing. At present, there are two endpoints registered locally to this Expressway. An H.323 endpoint with an alias of "EndpointA" is registered, and a SIP endpoint with an alias of "[email protected]" is also registered.

  How is this issue resolved?

  A. The dialplan must be redesigned to use the transforms to convert the alias into SIP URI format and then use separate search rules for each format that needs to be dialed within the local zone.

  B. The calls are failing because there are insufficient licenses. Additional licenses must be installed for the Expressway to route these calls.

  C. The current search rule does not match the call, so the search rule must be modified to include a SIP Variant of "Standards-Based".

  D. Calling parties are placing calls with the wrong domain. End-users must be instructed not to use the pod1.local domain as that is owned by the local system. Calls to any other domain would work.

  Correct Answer: A