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Free Cisco 300-820 CLHCT Practice Questions 2026 Part2

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Question #1
Jabber cannot log in via Mobile and Remote Access. You inspect Expressway - C logs and see this error message XCP_JABBERD Detail="Unable to connect to host '%IP%', port 7400(111) Connection refused" Which is the cause of this issue?
A. Rich Media Session licenses are not activated on Expressway - E
B. Expressway - E is listening on the wrong IP interface
C. The destination port for Expressway - E is set to 7400 instead of 8443 on the Expressway - C
D. The XCP Service is not activated on Expressway - E
View answer
Correct Answer: B

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Question #2
Which attribute in the SDP for a call is affected by the static NAT address configuration in an Expressway-E?
A. connection
B. name
C. version
D. bandwidth
View answer
Correct Answer: B
Question #3
Which attribute in the SDP for a call is affected by the static NAT address configuration in an Expressway-E?
A. connection
B. name
C. version
D. bandwidth
View answer
Correct Answer: B
Question #4
Which statement about scheduling Expressway backups is true?
A. It is not supported on the application
B. It is allowed from the application CLI of the Expressway only
C. It is allowed from the application CLI and GUI of the Expressway
D. It is allowed from the application GUI of the Expressway only
E. Reveal Answer
View answer
Correct Answer: A
Question #5
Which DNS record and port combination must be resolved externally for Mobile and Remote Access to be used?
A. _collab-edge on port 8443
B. _cisco-uds-edge on port 5061
C. _collab-edge on port 5061
D. _cisco-uds on port 8443
E. Reveal Answer
View answer
Correct Answer: A
Question #6
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. 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
B. Internal endpoints are registered to Expressway-E in the DMZ
C. 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
D. Internal endpoints are registered to Expressway-C in the DMZ
View answer
Correct Answer: A
Question #7
Refer to the exhibit. Refer to the exhibit. A manager asks an engineer to create a CSV file for the HTTP allow list on the Expressway deployment. The engineer wrote the script shown and uploaded it to the Expressway, but it is not being accepted. Which action resolves the issue?
A. AAdd the command POST at the end on this line ''http://myServer4/myPath4,block,,,POST''
B. BRemove the Method ''PUT'' from ''http://myServer2:8000/myPath2,allow ''my deployment'', ''an allow test'', PUT''
C. CRemove the line ''https://myServer4/myPath4,allow,,,GET''
D. DNothing is wrong, but the file type is most likely not XML
View answer
Correct Answer: C
Question #8
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?
A. Interworking in Expressway-C
B. Transcoding in Cisco Unified Communications Manager
C. Transcoding in Expressway-C
D. Interworking in Cisco Unified Communications Manager
View answer
Correct Answer: B
Question #9
What is the purpose of a transform in the Expressway server?
A. A transform has the function as a neighbor zone in the Expressway
B. A transform changes the audio codec when the call goes through the Expressway
C. A transform is used to route calls to a destination
D. A transform changes an alias that matches certain criteria into another alias
View answer
Correct Answer: D
Question #10
When designing the call control on a Cisco Expressway Core, which is the sequence of dial planfunctions?
A. ransforms, CPL, user policy, search rules
B. earch rules, zones, local zones
C. NS zone, local zone, search rules
D. earch rules, transforms
View answer
Correct Answer: A
Question #11
Which connection does the traversal zone configuration define?
A. Expressway-E and Collaboration Endpoints
B. Cisco UCS E-Series and Cisco UCM
C. Cisco UC and Cisco Unified Presence Server
D. Cisco Expressway-C and Cisco Expressway-E platforms
View answer
Correct Answer: D
Question #12
Which attribute in the SDP for a call is affected by the static NAT address configuration in an Expressway-E?
A. connection
B. name
C. version
D. bandwidth
View answer
Correct Answer: B
Question #13
Which attribute in the SDP for a call is affected by the static NAT address configuration in an Expressway-E?
A. connection
B. name
C. version
D. bandwidth
View answer
Correct Answer: B
Question #14
Refer to the exhibit.Refer to the exhibit. When Expressway-E routes a call with URI 4040@uclab.local to a DNS zone, which DNS server does the Expressway query for the SIP SRV records?
A. 10
B. 10
C. 10
D. 10
View answer
Correct Answer: A
Question #15
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
View answer
Correct Answer: C
Question #16
What happens to the encrypted signaling traffic of a collaboration device if you place it inside a firewall with private IP addresses and try to make a call over IP without any collaboration infrastructure?
A. The signaling makes it back to the endpoint because the firewall is an application layer gateway and provides address translation
B. Encrypted IP traffic for collaboration devices always is trusted by the firewall
C. The signaling does not make it back to the endpoint because the firewall cannot inspect encrypted traffic
D. The signaling makes it back to the endpoint because the endpoint sent the private address to the external endpoint
View answer
Correct Answer: B
Question #17
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
View answer
Correct Answer: C
Question #18
Which SIP media encryption mode is applied by default for newly created zones in the Cisco Expressway?
A. Off
B. Best Effort
C. Auto
D. Force Encrypted
View answer
Correct Answer: A
Question #19
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?
A. nterworking in Expressway-C
B. ranscoding in Cisco Unified Communications Manager
C. ranscoding in Expressway-C
D. nterworking in Cisco Unified Communications Manager
View answer
Correct Answer: A
Question #20
Which dial plan component is configured in Expressway-C to route a call to the Cisco UCM?
A. call routing
B. traversal subzone
C. call policy
D. search rule
View answer
Correct Answer: A
Question #21
Which attribute in the SDP for a call is affected by the static NAT address configuration in an Expressway-E?
A. connection
B. name
C. version
D. bandwidth
View answer
Correct Answer: B
Question #22
What it is the purpose of using ICE for Mobile and Remote Access endpoints in the Cisco Collaboration infrastructure?
A. ICE controls the bandwidth usage for Cisco Collaboration endpoints if the endpoints are located outside the company network
B. ICE enables Cisco Collaboration endpoints to determine if there is direct connectivity between them
C. ICE uses FAST updates to optimize the video quality in case of packet loss
D. ICE enablement allows for the Cisco Collaboration endpoint to register through Expressway servers to Cisco Unified Communications Manager behind a firewall
View answer
Correct Answer: B
Question #23
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. AThe peer 1 address in Expressway-C must be replaced by the FQDN of Expressway-C
B. BThe peer 1 address in Expressway-C is not the FADN of Expressway-E
C. CThe communication port is not set to 7001
D. DThe FQDN of Expressway-E cannot be resolved by the DNS server
E. EThe traversal zone TLS verify subject name in Expressway-E does not match the FQDN of Expressway-C
View answer
Correct Answer: AB
Question #24
Which protocol should be used to verify the connectivity for different media paths found during a call using ICE?
A. STUN
B. RTP
C. SNMP
D. TURN
View answer
Correct Answer: A
Question #25
Which protocol should be used to verify the connectivity for different media paths found during a call using ICE?
A. STUN
B. RTP
C. SNMP
D. TURN
View answer
Correct Answer: A
Question #26
For a Mobile and Remote Access deployment, which server's certificate must include the Unified registration domain as a Subject Alternate Name?
A. xpressway-E server certificate
B. xpressway-C server certificate
C. isco Unified Communications Manager server certificate
D. xpressway-C and Expressway-E server certificate
View answer
Correct Answer: A
Question #27
Which protocol should be used to verify the connectivity for different media paths found during a call using ICE?
A. STUN
B. RTP
C. SNMP
D. TURN
View answer
Correct Answer: A
Question #28
Which SIP media encryption mode is applied by default for newly created zones in the Cisco Expressway?
A. Off
B. Best Effort
C. Auto
D. Force Encrypted
View answer
Correct Answer: A
Question #29
A company already has a Cisco Unified Communications Manager for internal audio and video traffic, but it requires video communication with external partners and customers. It is important to ensure security for the deployment and the connectivity. What must be set up to enable this requirement?
A. Cisco Unified Border Element and Cisco ASA Firewall
B. Cisco Unified Border Element and Cisco Firepower Firewall
C. Cisco Expressway - C and Cisco Expressway - E
D. Cisco Expressway - C and Cisco Unified Border Element
View answer
Correct Answer: C
Question #30
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. 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
B. Internal endpoints are registered to Expressway-E in the DMZ
C. 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
D. Internal endpoints are registered to Expressway-C in the DMZ
View answer
Correct Answer: A
Question #31
Which dial plan component is configured in Expressway-C to route a call to the Cisco UCM?
A. call routing
B. traversal subzone
C. call policy
D. search rule
View answer
Correct Answer: A
Question #32
Which SIP media encryption mode is applied by default for newly created zones in the Cisco Expressway?
A. Off
B. Best Effort
C. Auto
D. Force Encrypted
View answer
Correct Answer: A
Question #33
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
View answer
Correct Answer: C
Question #34
Which describes what could done on the Expressway-E to successfully route calls from Expressway-Con the internal network to the Internet?
A. pplication layer gateway could be enabled to bridge the media traffic
B. static NAT route could be added to the firewall to bridge the two networks
C. he Expressway-E could be enabled for Dual-NIC capability
D. he Expressway-E could be enabled for interworking
View answer
Correct Answer: C
Question #35
Which media encryption mode can be configured on an Expressway zone?
A. Advanced Encryption Standard
B. IPsec
C. Triple Data Encryption Standard
D. force unencrypted
View answer
Correct Answer: D
Question #36
Which protocol should be used to verify the connectivity for different media paths found during a call using ICE?
A. STUN
B. RTP
C. SNMP
D. TURN
View answer
Correct Answer: A
Question #37
A customer is migrating from an on-premises Cisco UCM deployment to Webex Calling and successfully converted the phone firmware from Enterprise to MPP. After a user is configured with Webex Calling professional license and the MPP phone is added with a MAC address, the endpoint fails to register. What is the reason?
A. he remote office's firewall is blocking specific Webex service ports
B. he user has not signed into the Webex account
C. he phone must be added to the user before the license is assigned
D. he Webex App is not installed on the user's PC or is not running
View answer
Correct Answer: A
Question #38
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. 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
B. Internal endpoints are registered to Expressway-E in the DMZ
C. 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
D. Internal endpoints are registered to Expressway-C in the DMZ
View answer
Correct Answer: A
Question #39
When an Expressway-E is configured for static NAT, which Session Description Protocol attribute is modified to reflect the NAT address?
A. DP b-line
B. IP record route
C. DP c-line
D. DP m-line
View answer
Correct Answer: C
Question #40
Which attribute in the SDP for a call is affected by the static NAT address configuration in an Expressway-E?
A. connection
B. name
C. version
D. bandwidth
View answer
Correct Answer: B
Question #41
A company is installing Cisco Collaboration infrastructure and one of the requirements is that they must be able to communicate with many external parties thatare 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?
A. Interworking in Expressway-C
B. Transcoding in Cisco Unified Communications Manager
C. Transcoding in Expressway-C
D. Interworking in Cisco Unified Communications Manager
View answer
Correct Answer: A
Question #42
What is configured on the Expressway-E to successfully route calls from Expressway-C on the internal network to the Internet?
A. Application layer gateway is enabled to bridge the media traffic
B. A static NAT route is added to the firewall to bridge the two networks
C. The Expressway-E is enabled for Dual-NIC capability
D. The Expressway-E is enabled for interworking
View answer
Correct Answer: C
Question #43
Which dial plan component is configured in Expressway-C to route a call to the Cisco UCM?
A. call routing
B. traversal subzone
C. call policy
D. search rule
View answer
Correct Answer: A
Question #44
Between which two DTMF relay methods does the Expressway support interworking? (Choose two.)
A. unsolicited notify
B. RFC 2833
C. KPML
D. passthrough
E. H
View answer
Correct Answer: BE
Question #45
Which protocol should be used to verify the connectivity for different media paths found during a call using ICE?
A. STUN
B. RTP
C. SNMP
D. TURN
View answer
Correct Answer: A
Question #46
Which SIP media encryption mode is applied by default for newly created zones in the Cisco Expressway?
A. Off
B. Best Effort
C. Auto
D. Force Encrypted
View answer
Correct Answer: A
Question #47
Cisco Collaboration endpoints are exchanging encrypted signaling messages. What is one complication in implementing NAT ALG for voice and video devices?
A. NAT ALG is not compatible with the H
B. NAT ALG introduces latency in the media path
C. The NAT ALG cannot inspect the contents of encrypted signaling messages
D. NAT ALG requires the use of NAT re ection, which may not be supported on all fifirewalls
View answer
Correct Answer: C
Question #48
Which dial plan component is configured in Expressway-C to route a call to the Cisco UCM?
A. call routing
B. traversal subzone
C. call policy
D. search rule
View answer
Correct Answer: A
Question #49
What allows endpoints behind a NAT to discover the paths through which they will pass media?
A. RTP
B. TLS
C. SNMP
D. ICE
View answer
Correct Answer: D
Question #50
Where are voice calls handled in a Cisco Jabber hybrid cloud-based deployment with Cisco Webex Platform Service?
A. oice call use Cisco Unified Communications Manager for local calls and Webex Calling for external calls
B. oice calls use Webex Calling platform for call control and use hybrid media nodes for local conferencing
C. oice calls use local media nodes to keep traffic internal for internal traffic and use Webex Calling for external calls
D. oice calls use local Cisco Unified Communications Manager for all calls
View answer
Correct Answer: D

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