CLCOR Practice Test 10 — 10 Questions

Question 1

Which TWO of the following are valid methods for providing high availability for IP phones in a CUCM design?

Accepted Answer

SRST deployment. Option C (SRST deployment) is correct because Survivable Remote Site Telephony lets remote-site IP phones register with a local router/gateway when WAN connectivity to the CUCM cluster is lost, keeping basic call processing available and thus providing high availability for those phones. Option E (CUCM Group configuration) is correct because a CUCM Group defines an ordered list of CUCM nodes that a device pool's phones use for registration; if the primary subscriber fails, phones fail over to the next CUCM node in the group, which is the standard CUCM redundancy mechanism. Option A is not a high-availability method for phone registration: multiple TFTP servers in Option 150 only provide redundancy for configuration file download, not for call processing/registration. Option B is invalid because DHCP cannot provide IP address redundancy for phones; DHCP only leases addresses and does not offer a failover address mechanism for the phone itself. Option D is not a CUCM phone high-availability method; CUCM uses a primary/secondary/tertiary node failover model via CUCM Groups and device pools, not round-robin load balancing of phone registrations.

Answer

Configuring multiple TFTP servers in Option 150

Answer

IP address redundancy via DHCP

Answer

Load balancing via round-robin

Question 2

You are configuring Webex Hybrid Message Service. What is the primary purpose of this service?

Accepted Answer

To enable messaging between on-premises IM&P users and Webex App users.. Webex Hybrid Message Service (Hybrid Message) connects an on-premises Cisco IM and Presence (IM&P) deployment with Webex App so users on both sides can exchange instant messages. It is a hybrid connector-based service that federates the on-prem XMPP infrastructure with the Webex cloud messaging fabric, allowing a phased migration where some users remain on-prem while others move to the cloud.

Answer

To provide external federation for IM users.

Answer

To archive all Webex messages to an on-premises server.

Answer

To synchronize user passwords with Active Directory.

Question 3

Which protocol is primarily used for the transmission of real-time voice and video data between two endpoints?

Accepted Answer

RTP. RTP (Real-time Transport Protocol) is the protocol that actually carries the digitized voice and video media streams between endpoints in real-time communications. It runs over UDP to minimize latency and jitter, and is paired with RTCP for quality feedback. SIP, SCCP, and TFTP are signaling or provisioning protocols, not media transport.

Answer

SCCP

Answer

TFTP

Answer

SIP

Question 4

Where in Webex Control Hub do you go to view the health status of all deployed Hybrid Services connectors?

Accepted Answer

Services > Hybrid. In Webex Control Hub, Hybrid Services connector health is monitored under Services > Hybrid. This section lists each connector (e.g., Calendar, Message, Directory, Call) and shows its status, version, and any alerts. Administrators use this page to verify connector registration, connectivity, and health.

Answer

Devices > Management

Answer

Analytics > Reports

Answer

Users > Settings

Question 5

Which service allows Webex users to see the presence status of an on-premises Jabber user?

Accepted Answer

Hybrid Presence Service.. Hybrid Presence Service (also known as Webex Hybrid Presence) allows Webex users to see the presence status of on-premises Jabber users by connecting the on-premises IM and Presence Service to Webex. The service synchronizes presence between the on-premises Cisco IM and Presence cluster and Webex, so a Webex user can see whether a Jabber user is available, busy, or away. This is the specific service designed for cross-presence visibility.

Answer

Hybrid Calendar Service.

Answer

Webex Calling.

Answer

Directory Connector.

Question 6

You need to enforce a specific codec for calls traversing a CUBE. Where is the most appropriate place to apply this configuration?

Accepted Answer

Voice class codec applied to dial-peer. Codec enforcement on CUBE is applied via a voice class codec that is referenced by the dial-peer handling the call. The dial-peer is where media capabilities are negotiated for that call leg, so binding the codec class there gives per-destination control. Global voice service, SIP profiles, and interface configs do not enforce codecs.

Answer

Global voice service

Answer

SIP profile

Answer

Under the interface

Question 7

When configuring a Device Pool in CUCM, which parameter is responsible for defining the set of codecs used between devices in different regions?

Accepted Answer

Region. In Cisco Unified Communications Manager (CUCM), a Region defines the set of codecs used for calls between devices within that region and between different regions. Regions are used to manage bandwidth by specifying which codecs are allowed for intra-region and inter-region communication. The Region parameter directly controls the codec selection for calls between devices in different regions.

Answer

Calling Search Space

Answer

Date/Time Group

Answer

Location

Question 8

Which component in CUBE is responsible for ensuring that the call session is terminated correctly?

Accepted Answer

SIP Stack. The SIP Stack in CUBE is the protocol engine that handles SIP signaling end-to-end, including session setup, in-dialog requests, and proper session teardown via BYE transactions. It ensures that call sessions are terminated correctly by managing the SIP dialog state machine and sending/receiving the appropriate messages.

Answer

Dial-peer

Answer

Voice translation-profile

Answer

Voice-class codec

Question 9

You are implementing a QoS policy on a WAN edge router. You have a requirement to prioritize video traffic. Which queueing mechanism is recommended by Cisco to minimize jitter and latency for video streams?

Accepted Answer

Low Latency Queuing (LLQ). Low Latency Queuing (LLQ) is the Cisco-recommended mechanism because it combines a strict priority queue for delay-sensitive traffic (voice/video) with CBWFQ for all other classes, ensuring voice gets absolute priority while preventing starvation of other traffic. This minimizes jitter and latency for real-time streams.

Answer

Weighted Fair Queuing (WFQ)

Answer

Priority Queuing (PQ) only

Answer

Random Early Detection (RED)

Question 10

You are deploying CUBE. Which command enables the CUBE functionality on the Cisco IOS XE router?

Accepted Answer

mode border-element. CUBE (Cisco Unified Border Element) is enabled on IOS XE by entering voice service configuration mode and issuing the 'mode border-element' command. This switches the router's voice service into border-element mode, activating the SIP-based session border controller functionality that provides demarcation, protocol interworking, and security between the enterprise and the service provider.

Answer

enable cube

Answer

voice-service enable

Answer

service cube