Achive your Success with Latest Cisco 300-820 Exam [Sep 14, 2025]
The 300-820 Exam Test For Brief Preparation
Primary Expressway Configurations – 25%
This subject area measures the following skills of the candidates:
- Troubleshooting a Business to Business collaboration solution.
- Configuring the Expressway Core dial plan components (including transforms; zones; search rules; pipes & links; regular expressions);
- Configuring the core Expressway settings (including DNS; certificates; clustering; network firewall rules; QoS; network interfaces);
- Configuring a Business to Business collaboration solution (including neighbor zones; traversal zones; search rules; transforms; certificates; DNS records; SIP trunk integration with Cisco Unified Communications Manager);
- Configuring toll fraud avoiding within the Expressway series (without custom CPL scripts);
NEW QUESTION # 67
Refer to the exhibit.
While troubleshooting Cisco Jabber login issues, there are some error messages. Why is the Jabber client unable to sign in?
- A. down Cisco Unified Communications Manager server
- B. service discovery issues
- C. incorrect login credentials
- D. XMPP bind failures
Answer: D
NEW QUESTION # 68
An engineer learns from an end user that calls from outside the company are not being received.
Calls are being made to other businesses outside of the company on video using URL addresses.
The change management log shows no changes in the configuration of the collaboration solutions. The engineer examines the endpoint, which seems to be registered to the Cisco UCM, and the SIP trunk between the Cisco UCM and sees that the Expressway is also up. In addition, the traversal link shows no errors between the Expressways. Which action must the engineer take to troubleshoot this issue?
- A. On the Expressway-E, run diagnostic logging under maintenance to see if any requests reach the system.
- B. On the Expressway-E, check the NTP settings to ensure that TLS will be able to terminate. If the clock is out of sync, incoming calls from other working systems would work bur not outgoing calls from the company.
- C. On the Expressway-C, run a network log under administrative tools to see if any requests reach the system.
- D. On the Cisco UCM, run the Real-Time Monitoring Tool to see if any incoming calls fail.
Answer: A
NEW QUESTION # 69
The Cisco Webex Hybrid Message service is deployed geographically for separate Cisco Unified IM and Presence clusters. What must be configured in the Cisco Webex Control Hub to achieve this deployment?
- A. resource groups
- B. distributed DNS
- C. geo-locations
- D. verified domains
Answer: A
Explanation:
Reference:
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cloudCollaboration/spark/hybridservices/ messageservice/cmgt_b_spark-hybrid-message-deployment-guide/cmgt_b_spark-hybrid-messagedeployment-guide_chapter_00.html
NEW QUESTION # 70
Refer to the exhibit.
An Expressway-C and Expressway-E are configured for B2B calling and the Expressway- E zone is set to TLS Verify Currently, calls do not reach the Expressway-C. The Traversal Client zone on the Expressway-C for B2B reports the information in the exhibit for the Peer 1 address.
Which action resolves this error?
- A. Add a server certificate to the Expressway-C that is signed by a certificate authority.
- B. Configure the Expressway-C Traversal Client zone transport protocol with TCP.
- C. Configure the Expressway-C Traversal Client zone Peer 1 address with the fully qualified domain name of the Expressway-E.
- D. Add an intermediate certificate to the Expressway-C that is signed by a certificate authority.
Answer: D
NEW QUESTION # 71
Refer to the exhibit.
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. A DNS SRV record must be created for _collab-edge._tls.pod1.local that points to the Expressway-E.
- B. The username [email protected] is invalid. The user should instead sign-in simply as jabberuser.
- C. Skype for Business mode must be disabled on the DNS server because it conflicts with Jabber login requirements.
- D. The domain pod1.local must be deprovisioned from the Webex cloud for Jabber logins.
Answer: A
NEW QUESTION # 72
Refer to the exhibit. A company has a Cisco collaboration infrastructure that contains Cisco UCM and Cisco Expressway-C and Expressway-E for Mobile and Remote Access. When the engineer sets up the environment to support B2B calling, they discover that the zone stale between Expressway-C and Cisco UCM failed. What must the STEP Trunk Security Profile setting be changed to in Cisco UCM to resolve the issue?
- A. value other than the default listening port for incoming SIP connections on Cisco UCM
- B. UDP for the outgoing transport type
- C. TCP for the incoming transport type
- D. value other than the default listening port for outgoing SIP connections on Cisco UCM
Answer: C
NEW QUESTION # 73
Which two protocols are supported on Expressway Zones? (Choose two.)
- A. SCCP
- B. H.248
- C. H.323
- D. MGCP
- E. SIP
Answer: C,E
NEW QUESTION # 74
Cisco media traversal technology has enabled a secure environment where internal video endpoints call and receive calls from external video endpoints. How does the Expressway-C and Expressway-E communicate?
- A. Internal endpoints are registered to Expressway-E in the DMZ. Expressway-C, which is also in the DMZ, will receive and make calls on behalf of Expressway-E because they are in the same network.
- B. Expressway-C establishes an outgoing request to Expressway-E, enabling the Expressway-E in the DMZ to notify the internal Expressway-C of an incoming call from an external endpoint.
- C. Internal endpoints are registered to Expressway-C in the DMZ. Expressway-E, which is also in the DMZ, will receive and make calls on behalf of Expressway-C because they are in the same network.
- D. Expressway-E establishes an outgoing request to Expressway-C, enabling the Expressway-C in the DMZ to notify the internal Expressway-E of an incoming call from an external endpoint.
Answer: B
NEW QUESTION # 75
Refer to the exhibit.
Refer to the exhibit. An engineer must configure a B2B traversal zone. Trusted certification authority and server certificates are uploaded to Cisco Expressway-C and Expressway-E servers. After the traversal zone configuration is completed in Expressway-C, the error message in the exhibit appears. What are the two reasons for the error? (Choose two.)
- A. The traversal zone TLS verify subject name in Expressway-E does not match the FQDN of Expressway-C.
- B. The communication port is not set to 7001.
- C. The peer 1 address in Expressway-C must be replaced by the FQDN of Expressway-C.
- D. The peer 1 address in Expressway-C is not the FADN of Expressway-E.
- E. The FQDN of Expressway-E cannot be resolved by the DNS server.
Answer: C,D
NEW QUESTION # 76
With QoS enabled, which two statements about the Cisco Webex Video Mesh Node signaling and media traffic are true? (Choose two.)
- A. From Webex cloud to VMN, the source UDP port 9000 is used for audio traffic.
- B. From VMN to CUCM SIP endpoints, the source UDP ports from 52500 to 62999 is used for audio traffic.
- C. From VMN to Webex cloud, the destination UDP port 9000 is used for video traffic.
- D. From VMN to video endpoints, the destination UDP port 5004 is used for audio traffic.
- E. From VMN to Webex Teams clients, the source UDP port 5004 is used for video traffic.
Answer: B,E
Explanation:
NEW QUESTION # 77
Refer to the exhibit. When Expressway-E routes a call with URI [email protected] to a DNS zone, which DNS server does the Expressway query for the SIP SRV records?
- A. 10.40.40.40
- B. 10.20.20.20
- C. 10.10.10.10
- D. 10.30.30.30
Answer: B
NEW QUESTION # 78
What is a description of an Interactive Connectivity Establishment?
- A. It allows calling external endpoints with reduced overhead under VPN connections.
- B. It is used to find the best media path between network elements in traversal calls.
- C. It is used by B2BUA to keep the firewall ports opened for inbound/outbound calls.
- D. It allows Mobile and Remote Access endpoints to connect video calls signaling peer-to-peer.
Answer: B
NEW QUESTION # 79
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-E and endpoints outside the enterprise
- C. Cisco Expressway-C, Cisco Expressway-E, and Cisco Unified Communications Manager
- D. Cisco Expressway-C, Cisco Unified Communications Manager, and IM&P
Answer: A
NEW QUESTION # 80
Refer to the exhibit.
Refer to the exhibit. After hardening the Cisco Expressway, an engineer noticed this error in the logs HTTP error 429 "Too Many Requests," and users report that authentication is not possible on more than two devices. What must the engineer increase to correct the issue?
- A. rate control period
- B. credentials cleanup interval
- C. maximum authorizations per period
- D. credentials refresh interval
Answer: C
NEW QUESTION # 81
Which two licenses are required for the B2B feature to work? (Choose two.)
- A. Advanced Networking
- B. TURN Relays
- C. Traversal Server
- D. Rich Media Sessions
- E. Device Provisioning
Answer: C,D
NEW QUESTION # 82
When deploying an Expressway Core and Expressway Edge cluster for mobile and remote access, which TLS verity subject name must be configured on the Expressway-E UC traversal zone?
- A. Expressway-E Cluster Name
- B. Expressway-C Cluster Name
- C. Cisco Unified Communications Manager Publisher FQDN
- D. Webex CUSP Cluster Name
Answer: B
Explanation:
On Expressway E, Enter the name to look for in the traversal client's certificate (must be in either the Subject Common Name or the Subject Alternative Name attributes). If there is a cluster of traversal clients, specify the cluster name here and ensure that it is included in each client's certificate.
Traversal Client is EXP-C
https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X8-
8/Mobile-Remote-Access-via-Expressway-Deployment-Guide-X8-8.pdf
NEW QUESTION # 83
A video device registered with Cisco UCM failed to make an outbound B2B call. From Expressway-C diagnostic logs, an engineer found that the destination pattern is "[email protected]:5061", and the call was dropped with a 404 response code from Expressway-C. The search rule intended for this call-in Expressway-C is configured for Alias Pattern Match, Pattern type "Suffix," and Pattern "example.com". How must the configuration be changed to allow the call?
- A. Create a call policy rule on Expressway-E to allow calls to port 5061.
- B. Update the route pattern in Cisco UCM to send calls to "example.com" to the correct port.
- C. Create a transform on Expressway-C to strip port numbers.
- D. Update the call policy list in Expressway-C to allow calls to "example.com".
Answer: C
NEW QUESTION # 84
Refer to the exhibit.
Refer to the exhibit. What are "Type" field values for this Expressway servers zone configuration?
- A. Expressway-C Traversal server', Expressway-E Traversal client*
- B. Expressway-C "DNS", Expressway-E Traversal server'
- C. Expressway-C "Neighbor'. Expressway-E 'Neighbor'
- D. Expressway-C Traversal client", Expressway-E Traversal server'
Answer: D
NEW QUESTION # 85
Refer to the exhibit.
When configuring a search rule that routes calls to a zone, what occurs when 13358 is dialed?
- A. 13358 is replaced by 135, and then is sent to the local zone.
- B. 13358 is replaced by 135 and remains in the same zone.
- C. 13358 is sent directly to the traversal zone.
- D. 13358 is replaced by 135, and then is sent to the traversal zone.
Answer: C
NEW QUESTION # 86
Drag and drop the services from the left onto their descriptions on the right. Some services are used more than once.
Answer:
Explanation:
NEW QUESTION # 87
Refer to the exhibit.
Cisco Unified Communications Manager routes the call via the Webex Meetings route list and route group to the Video Mesh cluster Node#1 in the Video Mesh cluster is hosting the meeting and has reached full capacity, but other nodes in the cluster still have spare capacity.
What happens to the participant's call?
- A. The call is queued.
- B. Another node in the cluster is used and an intra-cluster cascade between the two Video Mesh nodes is formed.
- C. Another node in the cluster is used and an intra-cluster cascade between Webex and the new Video Mesh node is formed.
- D. The call fails.
Answer: C
NEW QUESTION # 88
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