300-825 Implementing Cisco Collaboration Conferencing (CLCNF) Practice Questions
Prepare for 300-825 with more than an answer.
- Exam fee
- $300 USD
- Level
- Professional
- Valid for
- 3 years
Domains covered on the exam 4
- Conferencing Architecture20%
- Installation and Configuration30%
- Integration25%
- Troubleshooting25%
- 1
An organization is configuring their Cisco Meeting Server to stream town-hall meetings to a third-party content delivery network (CDN). Which protocol must be used by the CMS Streamer component to send the live video feed to the CDN?
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Correct answer: D
The Cisco Meeting Server Streamer component uses the Real-Time Messaging Protocol (RTMP) to push the live video stream to an external streaming server or CDN. The administrator must configure the Streamer with the RTMP URL provided by the third-party service.
- 2
A collaboration engineer has integrated a Cisco Meeting Server with a CUCM cluster to be used as a conference bridge. The goal is for users to dial an extension, for example 8999, to initiate an ad-hoc conference. Which two CUCM components must be configured to make this work? (Select TWO)
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Correct answer: A, D
The CMS, once defined as a conference bridge in CUCM, must be placed into a Media Resource Group (MRG). This group acts as a container for media resources.
The Media Resource Group List (MRGL) defines an ordered list of MRGs. This MRGL is then assigned to devices or device pools. When a device needs a conference bridge, CUCM searches the MRGs within its assigned MRGL to find an available resource.
- 3
True or False: In a Cisco Meeting Server deployment, the XMPP server component is primarily responsible for managing media streams between participants in a conference.
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Correct answer: B
This statement is false. The Call Bridge is the core component responsible for all media processing, mixing, and stream management in a Cisco Meeting Server conference. The XMPP server is responsible for signaling functions, such as call control, presence, and chat for clients like the Cisco Meeting App.
- 4
An administrator is configuring a new Cisco Meeting Server via the MMP command-line interface. To enable the Call Bridge service to listen for SIP calls on its first Ethernet interface (eth0) on the standard unencrypted port, the
callbridge sip listencommand must be used. What parameter should follow the command?Show answer details
Correct answer: C
The
callbridge sip listencommand requires the interface name as a parameter.eth0specifies the first Ethernet interface. The command defaults to the standard SIP port 5060, so only the interface name is required in this case. - 5
A user is experiencing poor video quality when joining a Cisco Meeting Server conference via WebRTC from their home office. A network administrator uses the browser's built-in WebRTC statistics (like
chrome://webrtc-internals) and observes that thegoogCandidatePairin use has aremote-candidate-typeofrelay. What does this indicate about the user's connection?Show answer details
Correct answer: B
In the Interactive Connectivity Establishment (ICE) process, a
relaycandidate type means the connection is being made through a TURN server. This is a fallback mechanism used when a direct host-to-host (host) or NAT-translated (srflx) connection cannot be established. Using a TURN relay adds latency and can be a source of poor quality, indicating a potential network issue at the user's location. - 6
A collaboration engineer is troubleshooting a Cisco Meeting Server deployment where external WebRTC users report one-way video issues; they can see others, but others cannot see them. Internal SIP endpoints function correctly. A packet capture on the external firewall reveals that while inbound UDP traffic from clients to the Expressway-E's public IP is permitted, outbound UDP traffic from the Expressway-E to the internet is blocked. Which service is most directly impacted by this firewall rule?
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Correct answer: B
The TURN (Traversal Using Relays around NAT) server on the Expressway-E is responsible for relaying media packets for WebRTC clients that cannot establish a direct peer-to-peer connection. When the firewall blocks outbound UDP traffic from the Expressway-E, the TURN server cannot send the client's relayed video stream back out to the internet, resulting in one-way video. The client can receive video because inbound UDP is allowed, but their own video stream is dropped at the firewall.
- 7
A financial institution has deployed a scalable and resilient Cisco Meeting Server cluster across two data centers for disaster recovery. The lead architect needs to ensure that if the primary data center's database server fails, the secondary server can be promoted to master with minimal data loss and manual intervention. Which two actions are critical to achieving this goal? (Select TWO)
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Correct answer: A, C
Synchronous replication ensures that a transaction is written to both the master and standby databases before it is committed. This minimizes the risk of data loss during a failover, which is a critical requirement for a financial institution.
In a CMS database cluster, failover is a manual process. The
database cluster promotecommand must be run on the standby server to make it the new master. Automating this process via a script triggered by monitoring checks is the standard best practice to minimize manual intervention and reduce recovery time. - 8
A university is integrating their on-premises Cisco Meeting Server with Microsoft Skype for Business 2019 to allow faculty to join Cisco-hosted meetings from their SfB clients. The integration is failing. Analysis shows that the Expressway-C is rejecting the SIP INVITEs from the SfB Front End server. The traversal client zone on Expressway-C is configured for TLS, and a packet capture shows the SfB server is presenting a certificate with its FQDN in the Common Name. What is the most likely cause of the rejection?
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Correct answer: A
When using TLS verification, the Expressway-C must be configured to trust the subject name presented in the certificate from the connecting peer. In an integration with Skype for Business, the FQDN of the SfB Front End server must be explicitly added to the 'TLS verify subject name' list in the corresponding traversal client zone on the Expressway-C. If this name is missing, Expressway-C will reject the connection as untrusted.
- 9
During a scheduled maintenance window, an administrator needs to perform a backup of a standalone Cisco Meeting Server. The security policy mandates using secure protocols for all file transfers. The administrator plans to use the MMP command line. Which command correctly initiates a backup to a remote server at 192.168.10.50 using the 'backupuser' account?
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Correct answer: C
The correct MMP command to initiate a backup is
backup snapshot. The syntax requires the username, the server IP address or FQDN, and the target filename, separated by an '@' and a ':'. This command uses SFTP, a secure protocol, to transfer the backup file. - 10
True or False: When deploying Cisco Meeting Server in a single split deployment, the Web Bridge component must be enabled on the Edge server in the DMZ to allow external WebRTC access.
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Correct answer: A
In a single split deployment, the CMS server in the DMZ (the Edge server) handles external connectivity. The Web Bridge is the component that serves the web application to browser-based clients and terminates their media and signaling. Therefore, it is essential to enable the Web Bridge on the Edge server to facilitate external WebRTC access.
