300-820 Exam Preparation Material with New 300-820 Dumps Questions
300-820 2026 Training With 210 QA's
NEW QUESTION # 73
Which complication does a NAT introduce in SDP for a SIP call?
- A. When the client is behind a NAT they may be unable to determine the appropriate offset due to time zones.
- B. Additional headers due to NAT encapsulation can cause the packet size to exceed the MTU.
- 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.
Answer: D
NEW QUESTION # 74
Refer to the exhibit.
Refer to the exhibit. Logins and failing via mobile and remote access. How is this resolved?
- A. SIP is disabled on the Expressway-E. The SIP protocol must be enabled on the server.
- B. No Cisco UCM servers are configured in the Expressway-C. Servers must be added for CallManager and IM and Presence services.
- C. Mobile and remote access login has not been enabled for the domain configured in the Expressway-C. The domain must be edited to allow Cisco UCM registrations.
- D. Although a traversal client zone exists, there is no Unified Communications traversal client zone. One must be created.
Answer: D
NEW QUESTION # 75
In a Mobile and Remote Access deployment, where must communications be encrypted with TLS?
- A. Cisco Expressway-C, Cisco Expressway-E, and endpoints outside the enterprise
- B. Cisco Expressway-C, Cisco Unified Communications Manager, and IM&P
- C. Cisco Expressway-C, Cisco Expressway-E, and Cisco Unified Communications Manager
- D. Cisco Expressway-E and endpoints outside the enterprise
Answer: A
Explanation:
All signaling between the Cisco Expressway-E and the external endpoints must be encrypted and depending on the endpoint software version, traffic must also be authenticated with certificates.
The communication between the Cisco Expressway-C and the Cisco Expressway-E must always be encrypted and authenticated using server certificates from both servers.
MRA requires secure communication between Expressway-C and Expressway-E, and between Expressway-E and external endpoints.
https://www.cisco.com/c/en/us/support/docs/unified-communications/expressway/118798- technote-cucm-00.html
NEW QUESTION # 76
An engineer is configuring the Expressway cluster to allow Jabber clients that are outside the enterprise network to register, make calls, and send instant messages using the internal Cisco UCM. Which action must be taken before a secure UC traversal zone is added to the Expressway-C?
- A. Add a Cisco UCM cluster.
- B. Add Instant Message and Presence service clusters.
- C. Configure SIP OAuth mode.
- D. Establish certificate trust between the Expressway-C and Expressway-E.
Answer: D
NEW QUESTION # 77
A Cisco Webex Hybrid Video Mesh Node can be installed in the DMZ and on the internal network.
Which statement is true?
- A. 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.
- B. 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.
- C. Webex Cloud supports either a DMZ-based Mesh Node for security or an internal-based Mesh Node for media control only.
- D. 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.
Answer: A
Explanation:
The external firewall will need to allow UDP traffic from ANY port to the address of the Video Mesh Nodes via port 5004, so that roaming Webex Teams endpoints can send media to the nodes. This is not a preferred approach.
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Collaboration/hybrid/12x/hybcvd/hms.html
NEW QUESTION # 78
Refer to the exhibit. Which description of the transformation is true?
- A. It converts [email protected]:<port> to [email protected]
- B. It changes [email protected]:<port> to [email protected]
- C. It converts [email protected]:<port> to [email protected]
- D. It changes all patterns that begin with [email protected]:<port> to [email protected]
Answer: C
NEW QUESTION # 79
Where can the administrator manage a Webex tenant?
- A. Cisco Webex control panel
- B. Cisco Webex administrator portal
- C. Cisco Webex management portal
- D. Cisco Webex Control Hub
Answer: D
NEW QUESTION # 80
An administrator made changes to a directory connector for Webex AD synchronization. The number of users synchronized is quite large and the change should affect only a limited number of users. How can the administrator check the result before executing the synchronization?
- A. Initiate an incremental synchronization from the Director Connector app on the on-premises Windows server because it will ask to save the changes.
- B. Initiate a dry run of an incremental synchronization from the Director Connector in Control Hub.
- C. Initiate a dry run of an incremental synchronization from the Director Connector app on the on-premises Windows server.
- D. Initiate an incremental synchronization from the Director Connector in Control Hub because it will ask to save changes.
Answer: D
NEW QUESTION # 81
Which two statements about Cisco Webex Video Mesh Nodes are true? (Choose two.)
- A. When Cisco Unified Communications Manager works with multiple VMNs, Cisco Unified CM decides which VMN is used for signaling connection.
- B. The cascading traffic between VMN must bypass the firewall.
- C. A VMN can terminate a media connection while operating in maintenance mode.
- D. Cloud-registered devices choose a VMN cluster based on the lowest STUN round trip delay.
- E. When Expressway Core works with VMN clusters, Expressway Core decides which VMN is used for signaling/media connection.
Answer: A,D
NEW QUESTION # 82
An engineer must enable the communication between two separate Expressway-C servers to allow inbound and outbound calling between different endpoints registered on each server. Which configuration must happen?
- A. Configure a transform on each server to convert the calling alias into the called alias.
- B. Configure a neighbor zone on each server with a destination of the other Expressway-C.
- C. Configure a transform on each server to strip the port numbers at the end of the alias.
- D. Configure a traversal zone on each server with a destination of the other Expressway-C.
Answer: B
NEW QUESTION # 83
Refer to the exhibit.
What is the result of a transformation applied to alias 88514?
- A. [email protected]
- B. [email protected]
- C. [email protected]
- D. 88513@ccnpcollab com
Answer: B
NEW QUESTION # 84
When does the Webex App Endpoint send media to the Video Mesh cluster during a meeting?
- A. when the round-trip delay to the Video Mesh cluster is shorter than the round-trip delay to the Webex cloud media services
- B. when there is insufficient bandwidth at the MPLS WAN edge.
- C. when the Webex cloud media services are offline
- D. when there is insufficient bandwidth at the internet edge
Answer: A
NEW QUESTION # 85
A call is sent by Cisco UCM to Expressway with a URI of [email protected]. If (7508...) @expc1a\.pod8\.test\.lab.* is the pattern string, what would be the replacement string of the transform in Expressway to re-write the call so that it becomes
[email protected]?
- A. \1@conf\.pod8\.test.lab.!
- B. \1@conf\.pod8\.test\lab.*
- C. \[email protected]\.test\.lab
- D. \1@conf\.pod8.test.lab.@
Answer: C
NEW QUESTION # 86
A company has an on-premises Cisco collaboration cluster that contains Cisco UCM, IM and Presence, and Cisco Webex in the cloud. The company wants to integrate the on-premises infrastructure with Webex to enable interoperability with the Webex App. An engineer already configured the cluster in Cisco UCM, IM and Presence, and the organization in the Webex Control Hub. Which action must the engineer take to complete the configuration?
- A. Deploy a Cisco Expressway Message Connector host.
- B. Deploy Directory Connector.
- C. Open the TCP 443 port from IM and Presence to Webex Cloud.
- D. Deploy a Webex Device Connector.
Answer: B
NEW QUESTION # 87 
Refer to the exhibit. If the Webex Teams device cannot connect to Video Mesh Cluster-1 because it is busy, which media node does the Webex Teams device connect to next?
- A. Both Cloud Node US-EAST and US-WEST
- B. Cloud Node US-EAST
- C. Cloud Node US-WEST
- D. Video Mesh Cluster-2
Answer: D
NEW QUESTION # 88
A company has enabled ICE to optimize call flows and improve video quality between their Cisco Collaboration endpoints internally and externally.
For which reason would you see activity on the TURN server when a call is established between two external endpoints?
- A. ICE cannot reduce the packet loss on the link
- B. The video call is using encryption, which is not supported by ICE with CUCM 12.5
- C. The video call is using 4K resolution, which is not supported by ICE with CUCM 12.5
- D. A STUN cannot punch holes in the firewall
Answer: D
NEW QUESTION # 89
A company has a traversal client that resides in the DMZ in the enterprise network and has a requirement for B2B calling. Which Cisco Collaboration Edge component addresses this requirement?
- A. Cisco Expressway-E
- B. Cisco Unified Border Element
- C. Cisco TelePresence ISDN gateway
- D. Cisco Expressway-C
Answer: A
NEW QUESTION # 90
An administrator is configuring a new Cisco Webex Hybrid Message Service deployment, and the Expressway-C Message Connector is successfully registered in the Control Hub. After the server information of the IM and Presence server is added to the Expressway-C, an error "Connectivity to IM and Presence AXL Service could not be established" is displayed in the Control Hub. The Cisco AXL Web Service is enabled on the IM and Presence Service publisher, and the main administrator account enabled for AXL API permission is being used.
Which configuration change must be made to resolve this error?
- A. Enable an End User account for AXL.API permissions on the IM and Presence Service publisher
- B. Enable the Cisco AXL Web Service on the Expressway-C Message Connector
- C. Enable a second administrator account for AXL API permissions on the IM and Presence Service publisher
- D. Enable the Cisco AXL Web Service on the Control Hub
Answer: C
Explanation:
Configure an account for Message Connector to access the AXL API of the Cisco Unified Communications Manager IM and Presence Service. You must use an independent administrator account, not the main administrator account.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cloudCollaboration/spark/hybridservices/m essageservice/cmgt_b_spark-hybrid-message-deployment-guide/cmgt_b_spark-hybrid-message- deployment-guide_chapter_010.html
NEW QUESTION # 91
A company is implementing Cisco Webex but has existing legacy Cisco video endpoint registered on-premises. The administrator of Webex wants the SIP address of these rooms to appear in the directory listing on Webex registered endpoints and in the Webex App. How can this be configured?
- A. Using the Directory Connector, room resources without Webex licenses can be synchronized with Webex to make the SIP address appear in the phonebook of the Webex App or the endpoint.
- B. Using the Directory Connector, room resources without Webex licenses can be synchronized with Webex to make the room appear in the phonebook of the Webex App or the endpoint. SIP address is then entered from Control Hub because it will not match the field.
- C. Using the Directory Connector, room resources with flex licenses only can be synchronized with Webex to make the room appear in the phonebook of the Webex App or the endpoint. SIP address is then entered from Control Hub because it will not match the field.
- D. Using the Directory Connector, room resources with flex licenses only can be synchronized with Webex to make the SIP address appear in the phonebook of the Webex App or the endpoint.
Answer: C
NEW QUESTION # 92
Refer to the exhibit. Which two outbound connections should an administrator configure on the internal firewall? (Choose two.)
- A. SIP TCP 5061
- B. HTTPS: TCP 8443
- C. SIP: TCP 7001
- D. Media: UDP 36012 to 59999
- E. XMPP: TCP 7400
Answer: C,E
Explanation:
https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-
5/Cisco-Expressway-IP-Port-Usage-for-The internal firewall must allow the following outbound connections from the Expressway-C to the Expressway-E:
SIP: TCP 7001
Traversal media: UDP 2776 to 2777 (or 36000 to 36011 for large
VM/appliance)
XMPP: TCP 7400
HTTPS (tunneled over SSH between C and E): TCP 2222
NEW QUESTION # 93
Which option mandates that calls fall back to unencrypted media if encryption cannot be established?
- A. force encrypted
- B. force unencrypted
- C. auto
- D. best effort
Answer: D
NEW QUESTION # 94
When a Cisco Webex Video Mesh Node is co figured for an organization, which process does the Webex Teams client use to discover the optimal bridging resource?
- A. an HTTPS speed and latency test to each node and the cloud
- B. a reachable Video Mesh Node and then overflows to the cloud, if needed
- C. the lowest STUN round-trip delay to each node and cloud
- D. the SIP delay header during call setup
Answer: B
Explanation:
https://www.cisco.com/c/en/us/solutions/collateral/unified-communications/spark-hybrid- services/datasheet-c78-738153.html
NEW QUESTION # 95
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Refer to the exhibit showing logs from the Expressway-C, a copy of the Expressway-E certificate, and the UC traversal zone configuration for the Expressway-C. An office administrator is deploying mobile and remote access and sees an issue with the UC traversal zone. The zone is showing "TLS negotiation failure". What is causing this issue?
- A. The Expressway-C is missing the FQDN of Cisco UCM in the Common Name of its certificate
- B. The Expressway-E certificate includes the Expressway-C FQDN as a SAN entry
- C. In the UC Traversal Zone on the Expressway-C, the peer address is set to the IP of the Expressway-E, which is not a SAN entry in the Expressway-E certificate
- D. The Expressway-E does not have the FQDN of Cisco UCM listed as a SAN in its certificate
Answer: D
NEW QUESTION # 96
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