cisco 300-820 Exam Questions
Questions for the 300-820 were updated on : Dec 05 ,2025
Page 1 out of 14. Viewing questions 1-15 out of 207
Question 1
Where is encryption enabled in a Cisco collaboration environment for dedicated hardware-based
video endpoint calls?
- A. Set enforce encryption in Cisco Expressway-C under Dial Plan Configuration.
- B. Set enforce encryption in regions in Cisco UCM.
- C. Set enforce encryption on every single endpoint.
- D. Ensure that Cisco UCM is set to restricted mode.
Answer:
B
Question 2
After an engineer implements load balancing in the Cisco CMS cluster, they observe that shortly after
the second Call Bridge is added to the cluster, calls into a space randomly disconnect when the calls
are from endpoints registered with Cisco UCM. Which action resolves the issue?
- A. Enable "Accept Out-of-dialog REFER" on the SIP Trunk security profile.
- B. Enable "Accept Unsolicited Notification" on the SIP Trunk security profile.
- C. Enable "Accept Presence Subscription" on the SIP Trunk security profile on Cisco UCM.
- D. Enable "Accept Replaces Header" on the SIP Trunk security profile on Cisco UCM.
Answer:
D
Question 3
Refer to the exhibit.
Refer to the exhibit. A Cisco UCM cluster in mixed mode is integrated with Cisco Expressway-C for
Mobile and Remote Access endpoint registration. TLS verify mode is enabled and self-signed
certificates with the same common name for Cisco Tomcat and Cisco Call Manager are uploaded to
Expressway-C. A Cisco Jabber client fails to register using secure SIP. Which two configurations are
the cause of the issue? (Choose two.)
- A. The Tomcat certificate has the incorrect FQDN for the Cisco UCM server.
- B. The Jabber client cannot connect to its associated phone device by using Cisco Computer Telephony Integration.
- C. The incorrect secure device profile was applied to the Jabber client.
- D. The Expressway-C does not allow two self-signed certificates with the same CN to be trusted.
- E. The Call Manager certificate is causing a conflict.
Answer:
D, E
Question 4
Which method is used to send the incoming call request to the client when the traversal server
receives an incoming call for the traversal client?
- A. Requesting for permission from the firewall
- B. Using an existing keep-alive connection opened by the client
- C. Opening an outbound connection directly to the client through the firewall
- D. Opening an inbound connection directly to the client through the firewall
Answer:
B
Question 5
Which statement correctly describes links and pipes in Cisco Expressway?
- A. A maximum of one pipe can be applied to a link.
- B. A call between two endpoints in the same subzone or zone fails if there is no pipe between the endpoints.
- C. A call between two endpoints in the same subzone or zone fails if there is no link between the endpoints.
- D. The lower bandwidth restriction is applied to calls over a link that is associated to two pipes.
Answer:
D
Question 6
An engineer noticed that internal participants using Full HD endpoints are joining meetings hosted in
the Video Mesh node. The quality of the calls is 720p. What must the engineer configure to support
1080p quality?
- A. Set the “Enhanced Layout Experience” within the Video Mesh settings in Cisco Webex Control Hub to 1080P HD video.
- B. Set the “Received Video Resolution” on the Video Mesh node to maximum.
- C. Turn on the “Enable 1080P HD video for all participants hosted on on-premises Video Mesh nodes” setting in the Cisco Webex Control Hub.
- D. Turn on the “Highest Detail, Best Motion: 1080P” setting in the Cisco Webex Control Hub.
Answer:
D
Question 7
Employees at company A must call employees at company B in an extension range of
[email protected]. Both companies have a Cisco collaboration infrastructure. All required zones
are configured in Cisco Expressways at company
- A. search rule with a regex pattern of [4]\d{3}@companyB\.com that targets the DNS zone
- B. search rule with a suffix pattern of *[email protected] that targets the neighbor zone
- C. call policy rule from the DNS zone to allow a destination pattern of 4[1-9]@companyB.com
- D. call policy rule from the neighbor zone to allow a destination pattern of 4[1-9]@companyB.com
Answer:
B
Question 8
A company decided to gradually move to the Cisco Webex Cloud from a Cisco on-premises solution.
One step is to configure a Cisco Hybrid Services connector. Where must an engineer make this
configuration?
- A. Deploy the Cisco Hybrid Services connector, which is an on-premises node, to allow for multiple Cisco collaboration environments to connect to Cisco Webex.
- B. Configure Hybrid Service in the Cisco Expressway-E in the DMZ to connect to the Cisco Webex Cloud.
- C. Configure Hybrid Services in Cisco Webex Control Hub in the Cisco Webex Cloud to enable Hybrid Services.
- D. Enable the Hybrid Services service on the Cisco UCM to allow the on-premises call control to establish a hybrid link to the Cisco Webex Cloud.
Answer:
C
Question 9
A company identifies a fraudulent toil situation. An engineer reviews the Cisco UCM call detail
records and discovers that fraudulent calls originate from a Cisco Expressway-C server and are then
routed to a 10-digit PSTN number. What must be configured to limit incoming Expressway calls to the
internal Cisco UCM range of extensions 5XXXX?
- A. calling search space that contains all the partitions on the Unified Communications Manager SIP trunk to Expressway
- B. call policy rule from the DNS zone to allow a destination regex pattern of \d.*@abc.com
- C. unique search rule with a regex pattern of [5]\d{4}@abc.com that targets the neighbor zone
- D. call policy rule from the DNS zone to allow a destination regex pattern of .*@abc.com
Answer:
C
Question 10
What is the benefit of configuring ICE, TURN and STUN in a Cisco Unified Collaboration environment?
- A. The ICE protocol enables the use of MRA for Cisco endpoints to register behind the firewall.
- B. The endpoints use fewer ports to minimize the port range and allows for multiple connections in a high-density deployment.
- C. It can traverse firewalls without opening incoming ports.
- D. The endpoints discover paths to optimize media flow and allows for peer-to-peer media traffic in some cases.
Answer:
D
Question 11
Refer to the exhibit.
Refer to the exhibit. An administrator set up a B2B interop with a business partner running a
Microsoft Lync environment and can successfully make outbound video calls to
[email protected]. Inbound calls to [email protected], however, are failing. A
quick SRV search returns the records in the exhibit. Which record must be modified to resolve this
challenge?
- A. _h323ls._udp.ciscovoice.com
- B. _sipfederationtcp._tcp.ciscovoice.com
- C. _sips._tcp.ciscovoice.com
- D. _collab-edge._tls.ciscovoice.com
Answer:
B
Question 12
Which set of actions configures ACME certificates on Expressways?
- A. Configure ACME Certificate settings on your Expressway-E, and change the ACME automated scheduler field to ON.
- B. Configure ACME Certificate settings on your Expressway-C, and change the ACME automated scheduler field to OFF.
- C. Configure ACME Certificate settings on your Expressway-C, and change the ACME automated scheduler field to ON.
- D. Configure ACME Certificate settings on your Expressway-E, disable the Expressway cluster, and change the ACME automated scheduler field to OFF.
Answer:
A
Question 13
Which option changes the addresses and ports in voice and video signaling messages?
- A. Firewall ALG
- B. NAT overload
- C. NAT Pinhole
- D. NAT ALG
Answer:
D
Question 14
Users in the Cisco Webex collaboration environment want to be able to use @webex when
scheduling a Webex meeting from their Outlook client connected to Office365. Which configuration
meets this requirement?
- A. Add an O365 tenant in the admin pages of Webex as a Microsoft 385 Global administrator.
- B. Add the Webex domain in the calendar integration services in the admin interface for Microsoft Exchange Online.
- C. Enable user onboarding for each user in the Webex admin interface. Each user will then authorize Webex to read only their calendar in a secure manner.
- D. Add an O365 tenant in the admin pages of Webex as a Webex site administrator.
Answer:
B
Question 15
Refer to the exhibit.
Refer to the exhibit. A collaboration engineer creates a transform to modify 4123@exp-
name.exp.domain:<port> to [email protected]. Which pattern behavior setting accomplishes this
task?
- A. replace
- B. strip
- C. add prefix
- D. add suffix
Answer:
A