263 questions total · 4pages · All types, answers revealed
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These patterns modify the calling party number before processing.
Why this answer
Calling Party Transformation Patterns are specifically designed to normalize incoming caller IDs at the CUCM level before they reach the endpoint.
Which component in the Cisco Collaboration architecture provides the initial configuration files (XML) to an IP phone upon registration?
The TFTP service delivers the configuration files.
Why this answer
The TFTP service in CUCM acts as the repository for device configuration files.
When designing a Cisco Jabber deployment using MRA, which internal service is responsible for providing the configuration file and server list to the client?
Expressway-C proxies the request to the internal CUCM for config file retrieval.
Why this answer
The Cisco Expressway-C (internal) acts as a proxy for the CUCM nodes to provide configuration files via HTTPS.
How do you verify if a phone is registered to the primary CUCM subscriber?
The status field indicates the registration state.
Why this answer
Device > Phone > Find > Look at the Status field in the search results or the device configuration page.
Which TWO of the following are valid requirements for deploying the Cisco Directory Connector? (Choose two)
The connector software runs on a Windows host.
Why this answer
The Directory Connector requires a Windows-based server and network connectivity to both the Active Directory domain controller and the internet (for the Webex cloud).
What is the primary benefit of the 'Webex Edge' strategy?
Edge services are designed to improve performance and quality.
Why this answer
Webex Edge optimizes the user experience by prioritizing Webex traffic and providing a more direct, secure, and reliable connection to the cloud.
You are monitoring RTP traffic using a protocol analyzer. You observe that the Payload Type field in the RTP header is set to 0. Which codec is currently in use?
Payload type 0 is reserved for G.711 u-law.
Why this answer
In G.711 PCMU (u-law), the assigned payload type is 0 according to RFC 3551.
Which TWO tasks must be performed when setting up Webex Hybrid Calendar service with Microsoft Exchange?
This is required for the service to access user calendars.
Why this answer
You must grant service account permissions to the calendar and configure the service in Control Hub.
A user in your organization cannot see their on-premises calendar events in the Webex App. You have verified that the Webex Hybrid Calendar Service is registered. What is the most likely cause?
The service account must have explicit permissions to impersonate or access the mailbox to read calendar data.
Why this answer
The Hybrid Calendar Service requires the user to be associated with an email address that matches the calendar resource; if the synchronization is failing, the Exchange or O365 integration requires re-authentication via the Connector host.
You are verifying the network readiness for a Cisco TelePresence endpoint. Which tool would you use to measure the packet loss, latency, and jitter on the path to the CUCM cluster?
IP SLA provides metrics for jitter, latency, and packet loss.
Why this answer
IP SLA (Service Level Agreement) is the Cisco IOS feature used to generate synthetic traffic to measure network performance metrics.
You are designing a dial plan with a centralized PSTN egress. What must you configure to ensure that local extensions can be dialed directly across sites?
This grants visibility to the partitions where the extensions reside.
Why this answer
You must configure a Calling Search Space that includes the partitions of all the internal extensions across the sites.
Which protocol is required for the Webex Hybrid Directory Connector to communicate with on-premises Active Directory?
LDAP is the industry standard for querying directory services.
Why this answer
The Directory Connector uses LDAP to query and sync users from the local AD to the Webex Cloud.
Which TWO of the following are valid methods to troubleshoot SIP call failures on a CUBE?
Provides snapshot of active call states.
Why this answer
debug ccsip messages and show call active voice are the primary tools for diagnosing SIP signaling and active session state.
These metrics directly identify network congestion or path quality issues.
Why this answer
The 'Quality of Service' (QoS) and 'Network Metrics' within the Webex Control Hub Troubleshooting section provide data on jitter, packet loss, and latency.
What is the purpose of the 'Webex Service' account in Active Directory when using Directory Connector?
Read permissions allow the connector to pull the necessary user data.
Why this answer
The service account requires specific permissions to read directory objects from the domain controller to synchronize them to the Webex cloud.
Which TWO of the following are key components of the Cisco QoS model for Voice?
These are fundamental first steps in any QoS strategy.
Why this answer
Voice traffic requires priority queuing and appropriate marking to ensure quality.
In a Cisco Collaboration environment, what is the purpose of the 'Media Termination Point' (MTP) in relation to call signaling?
MTPs are essential for resolving DTMF mismatches between different signaling protocols.
Why this answer
MTPs are used to provide features like DTMF interworking (e.g., SIP to H.323) when the endpoints do not support the same method.
Which THREE network conditions contribute to poor VoIP call quality in an RTP stream?
Delay causes conversation overlaps.
Why this answer
Latency, jitter, and packet loss are the primary enemies of voice quality.
A CUBE is configured for H.450.3 call forwarding, but it is not working. What is the most likely cause?
H.450 is H.323-based and doesn't translate natively to SIP supplementary services without gateway interworking.
Why this answer
H.450.3 is an H.323 supplementary service, which requires specific H.323 configuration and is often incompatible with SIP-based CUBE deployments without proper interworking.
What is the default dial-peer used if no other dial-peer matches a call on a Cisco IOS XE gateway?
Dial-peer 0 is the default catch-all.
Why this answer
Dial-peer 0 is the system default dial-peer that acts as a catch-all if no specific match is found.
Which TWO settings in the SIP Profile are crucial for interworking with a PSTN gateway that does not support PRACK?
Early offer is often required for interworking with legacy PSTN gear.
Why this answer
If a gateway doesn't support PRACK, the SIP Profile must be configured to disable it or ensure the CUCM handles the reliability requirement locally.
Which TWO of the following are functions performed by the CUBE as a Session Border Controller?
Handles codec and signaling conversions.
Why this answer
CUBE performs topology hiding and media interworking between different SIP networks.
Which protocol is primarily used by Cisco endpoints for music-on-hold (MoH) streaming from a Media Resource Group?
Multicast allows a single stream to be consumed by multiple endpoints.
Why this answer
Multicast is the standard method for streaming MoH, as it saves significant bandwidth compared to unicast streams.
Which TWO of the following features are supported by the Webex Hybrid Message Service? (Choose two)
Message exchange is the primary purpose of the service.
Why this answer
The Hybrid Message service facilitates presence updates and message exchange between on-premises IM&P users and the Webex App.
Which TWO of the following are considered best practices for implementing QoS in a Cisco collaboration network?
This ensures consistent classification throughout the path.
Why this answer
Cisco recommends using trust boundaries and marking traffic as close to the source as possible.
Which Cisco feature is used to ensure voice traffic is prioritized over web traffic on a Cisco access switch?
QoS enables traffic prioritization.
You are configuring a Webex Calling environment and need to integrate an on-premises PBX via a Local Gateway. Which component must be configured on the CUBE to ensure signaling reachability to the Webex Cloud?
The SIP trunk is the essential component for connecting the Local Gateway to the Webex Calling cloud.
Why this answer
A SIP Trunk must be established between the CUBE and the Webex Calling cloud using the specific Webex signaling IP addresses.
Which TWO of the following are required components of a Cisco Local Gateway deployment? (Choose two)
CUBE is the mandatory gateway component.
Which THREE of the following items are verified during the Webex Hybrid Service connector installation? (Choose three)
Permissions must be verified for the service to function.
Why this answer
The installation process validates that the Expressway-C can communicate with the cloud, that the certificates are trusted, and that the service account has the necessary permissions.
When configuring Hybrid Call Service for Cisco Unified Communications Manager, which specific requirement must be met for the Expressway-C and Expressway-E pair?
The 'Unified Communications' traversal zone is mandatory for Hybrid Call Service interworking.
Why this answer
The Expressway pair must be registered with the Webex cloud to enable the connector, and specific traversal zones must be configured to pass the signaling traffic.
When configuring CUBE for media flow-around, which command ensures the media goes directly between endpoints?
This allows direct end-to-end media.
Why this answer
media flow-around prevents the CUBE from inserting itself into the media path.
You need to verify that an endpoint is correctly sending RTCP reports to Cisco Unified Communications Manager. Which field in the RTCP packet header would you examine to track the jitter statistics?
The interarrival jitter field explicitly reports network quality.
Why this answer
RTCP SR (Sender Report) and RR (Receiver Report) packets contain interarrival jitter fields to help calculate network quality.
You want to implement 'Presence' so users can see the status of other users. Which service must be running on the IM and Presence server?
This service handles the core presence logic.
Why this answer
The 'Cisco Presence Engine' service is the core service that processes and updates presence states.
Which service, when enabled, allows CUCM to act as a recording server for calls?
The main service handles the recording features.
Why this answer
The Cisco Unified Communications Manager (CallManager) service can be configured to support Built-in Bridge (BIB) for recording.
In a Cisco CUCM cluster, which node is responsible for managing the database and performing configuration updates?
The Publisher is the master database node.
Why this answer
The Publisher node is the primary node that holds the master database copy and handles all configuration changes.
In a Webex hybrid environment, what is the primary role of the Expressway-C?
It facilitates the connection between internal services and the cloud.
Why this answer
The Expressway-C acts as the secure on-premises gateway that connects to the Webex cloud, handling signaling and media traversal.
Which component in CUBE is responsible for ensuring that the call session is terminated correctly?
The SIP stack handles call signaling and termination.
Why this answer
The SIP gateway functionality in IOS XE handles the SIP signaling state machine for call termination.
Which TWO factors significantly impact the choice of audio codec during a call setup in CUCM?
Orders the available codecs.
Why this answer
Bandwidth availability (Regions) and codec preference (Codec List) are the main determinants.
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Practice CLCOR by domain
Target a specific domain to shore up weak areas.