300-820 Practice Test Free – 50 Questions to Test Your Knowledge
Are you preparing for the 300-820 certification exam? If so, taking a 300-820 practice test free is one of the best ways to assess your knowledge and improve your chances of passing. In this post, we provide 50 free 300-820 practice questions designed to help you test your skills and identify areas for improvement.
By taking a free 300-820 practice test, you can:
- Familiarize yourself with the exam format and question types
- Identify your strengths and weaknesses
- Gain confidence before the actual exam
50 Free 300-820 Practice Questions
Below, you will find 50 free 300-820 practice questions to help you prepare for the exam. These questions are designed to reflect the real exam structure and difficulty level.
What is the purpose of a transform in the Expressway server?A. A transform has the function as a neighbor zone in the Expressway. It creates a connection with another server.
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.
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
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
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
Cisco Collaboration endpoints are exchanging encrypted signaling messages.
What is one major complication in implementing NAT ALG for voice and video devices?A. Internal endpoints cannot use addresses from the private address space.
B. The NAT ALG cannot inspect the contents of encrypted signaling messages.
C. NAT ALG introduces jitter in the voice path.
D. Source addresses cannot provide the destination addresses that remote endpoints should use for return packets.
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.
Which role does Call Policy play when preventing toll fraud on Expressways?A. It controls which calls are allowed, which calls are rejected, and which calls are redirected to a different destination.
B. It changes the calling and called number on a call.
C. It changes the audio protocol used by a call through Expressways.
D. It changes the audio codec used in a call through Expressways.
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 replaced by 135, and then is sent to the traversal zone.
D. 13358 is sent directly to the traversal zone.
Which service is available in a cloud-based deployment using Cisco Webex Messenger?A. Presence
B. Phone services
C. Voicemail
D. Call forward services
Refer to the exhibit. An engineer is deploying mobile and remote access in an environment that already had functioning Business to Business calling. Mobile and remote access SIP registrations are failing. To troubleshoot, SIP logs were collected. How is this issue resolved?A. Change the SIP profile on the SIP trunk for the Expressway-E to Standard SIP Profile for TelePresence Endpoint
B. Change the ג€Incoming Portג€ in the SIP Trunk Security Profile for the Expressway-C to not match SIP line registrations
C. Enable autoregistration for the appropriate DN range on the Cisco UCM servers running the CallManager service
D. Write a custom normalization script since the ג€vcs-interopג€ normalization script does not allow registrations
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
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
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.245 user input indication
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
What allows endpoints behind a NAT to discover the paths through which they will pass media?A. RTP
B. TLS
C. SNMP
D. ICE
Refer to the exhibit. Mobile and remote access is being added to an existing B2B deployment and is failing. When the administrator looks at the alarms on the
Expressway-C, the snippets are shown. Which configuration action should the administrator take to fix this issue?A. The listening port on the Expressway-C for SIP TCP must be changed to a value other than 5060
B. The listening port on the Expressway-C for SIP TLS must be changed to a value other than 5061
C. The listening port on the Cisco UCM for the Expressway-C SIP trunk must be changed to something other than 5060 or 5061
D. The listening port on the Cisco UCM for the Expressway-C SIP trunk is set to something other than 5060 or 5061. It must be set to 5060 for insecure and 5061 for secure SIP
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.
Which entry in the public (external) DNS is valid to configure DNS SRV records for a Cisco Mobile and Remote Access solution?A. _cisco-uds._tcp.
B. _cisco-mra._tls.
C. _collab-edge._tls.
D. _cisco-expwy._tls.
What are two reasons why port 8443 is unreachable from the Internet to the Expressway-E? (Choose two.)A. The MRA license is missing on the Expressway-E.
B. The Unified Communications zone is down.
C. Transform is not configured on Expressway-E.
D. The SRV record for _cisco-uds is misconfigured.
E. The firewall is blocking the port.
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. The video call is using encryption, which is not supported by ICE with CUCM 12.5
B. ICE cannot reduce the packet loss on the link
C. A STUN cannot punch holes in the firewall
D. The video call is using 4K resolution, which is not supported by ICE with CUCM 12.5
What is the Cisco-recommended key length in bits for a Cisco Expressway certificate?A. 1024
B. 2048
C. 4096
D. 8192
Refer to the exhibit. Which two numbers match the regular expression? (Choose two.)A. d20d16d20d22
B. 2091652010224
C. 209165200225
D. d209d165d200d224
E. 209165200224
An organization with a domain name of example.com.
Which two SRV records are valid for a SIP and H.323 communication? (Choose two.)A. _sips._tcp.example.com
B. _sips._udp.example.com
C. _h323ls._udp.example com
D. _h323ls._tcp.example.com
E. _collab-edge._tls.example.com
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
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.
When configuring a Cisco Expressway solution and need to design the dial plan with various rules for URIs and numbers coming through the device. To do so, it is important that some dial plan rules are applied in a certain order. When configuring the transform section, you must know the range of the priorities.
Which range is correct?A. any number in the drop-down menu
B. any number in the dialog box
C. any number between 1-128
D. any number between 1-65534
Which describes what could done on the Expressway-E to successfully route calls from Expressway-C on the internal network to the Internet?A. Application layer gateway could be enabled to bridge the media traffic.
B. A static NAT route could be added to the firewall to bridge the two networks.
C. The Expressway-E could be enabled for Dual-NIC capability.
D. The Expressway-E could be enabled for interworking.
Refer to the exhibit. What is the result of a transformation applied to alias 88514?A. 98851@ccnpcollab.com
B. 88513@ccnpcollab com
C. 88514@ccnpcollab.com
D. 88515@ccnpcollab.com
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
Refer to the exhibit. Which inbound connection should an administrator configure on the outside firewall?A. Media: UDP 36000 to 36011
B. XMPP: TCP 5222
C. SIP: TCP 5061
D. HTTPS (tunneled over SSH between C and E): TCP 2222
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.
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
Refer to the exhibit. In an environment SIP devices are registered to CUCM and H.323 devices to VCS.
What would be required to enable these calls to setup correctly?A. Create a presearch transform.
B. Change the domain of SIP endpoint A to cisco.com.
C. Disable SIP in the external zone.
D. Change the interworking mode to On.
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. 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.
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. 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.
Refer to the exhibit. A new neighbor zone is added for a new Cisco Meeting Server, but the zone is showing a SIP status of failed from the time the zone it was created. What should be done to resolve this issue?A. The search rule must be changed to continue on match
B. The existing zone using ID 7 must be deleted
C. More bandwidth must be added to the appropriate pipes
D. The underlying DNS issue must be resolved
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.
A call is sent by Cisco UCM to Expressway with a URI of
75080001@expc1a.pod8.test.lab
. 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
75080001@conf.pod8.test.lab
?A. 1@conf.pod8.test.lab.@
B. 1@conf.pod8.testlab.*
C. 1@conf.pod8.test.lab
D. 1@conf.pod8.test.lab.!
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
Refer to the exhibit. Which description of the transformation is true?A. It converts 4123@exp-name.exp.domain: to 4123@exp.domain
B. It changes all patterns that begin with 4123@exp-name.exp.domain: to 1@exp.domain
C. It changes 413@exp-name.exp.domain: to 413@exp.domain
D. It converts 4.3@exp-name.exp.domain: to 1@exp.domain
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 `
EndpointB@pod1.local
` 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 ג€Standards-Basedג€.
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.
Which step is taken when configuring a Cisco Expressway solution?A. Configure the Expressway-E by using a non-traversal server zone.
B. Enable static NAT on the Expressway-E only.
C. Disable H.323 mode on the Expressway-E.
D. Enable H.323 H.460.19 demultiplexing mode on the Expressway-C.
Which two items are configured when deploying a B2B collaboration solution? (Choose two.)A. SIP trunk between Cisco Unified Communications Manager and Cisco Expressway-C
B. search rules in Cisco Expressway-E
C. SIP trunk between Cisco Unified Communications Manager and Cisco Expressway-E
D. traversal client on a Cisco Expressway-E
E. DNS zone on a Cisco Expressway-C
Which mode should be used when Call Policy is configured on Expressways?A. extended CPL
B. local CPL, policy service, and off
C. on
D. remote CPL
When designing the call control on a Cisco Expressway Core, which is the sequence of dial plan functions?A. transforms, CPL, user policy, search rules
B. search rules, zones, local zones
C. DNS zone, local zone, search rules
D. search rules, transforms
Which zone is required on a B2B deployment between Expressway-C and Expressway-E?A. traversal zone
B. DNS zone
C. default zone
D. neighbor zone
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. Configure the Expressway-C Traversal Client zone Peer 1 address with the fully qualified domain name of the Expressway-E.
B. Configure the Expressway-C Traversal Client zone transport protocol with TCP.
C. Add a server certificate to the Expressway-C that is signed by a certificate authority.
D. Add an intermediate certificate to the Expressway-C that is signed by a certificate authority.
When determining why Mobile and Remote Access to Cisco TelePresence equipment does not work anymore for an organization. There are several administrators and configuration changes could have happened without anyone knowing. Internal communication seems to be working, but no external system can register or call anywhere. Gathering symptoms, you also discover that no internal systems can call out either.
What is TraversalZone missing that causes this issue?A. link to the DefaultZone
B. pipe to the DefaultZone
C. SIP trunk to the DefaultZone
D. route pattern to the DefaultZone
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
Which zone is required between Expressway-E and Expressway-C in Mobile and Remote Access deployments?A. Unified Communications traversal zone
B. neighbor zone
C. DNS zone
D. traversal zone
An Expressway-E is configured using a single NIC with NAT.
How must the Expressway-C traversal client zone be configured to connect to the Expressway-E?A. TLS verify must be enabled.
B. The zone profile must be set to default.
C. The peer address must be the Expressway-E NAT address.
D. The peer address must be the Expressway-E LAN 1 IP address.
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