CLCOR Practice Test 17 — 15 Questions

Question 1

A collaboration designer must ensure that inter-cluster calls between two CUCM clusters remain secure. Which mechanism must be implemented to ensure media remains encrypted from end to end?

Accepted Answer

Ensure SRTP is enabled on the SIP Trunk Security Profile.. To ensure media remains encrypted end-to-end between two CUCM clusters, SRTP must be enabled on the SIP Trunk Security Profile. This setting ensures that the media streams (RTP) are encrypted using SRTP, providing confidentiality and integrity for the call. Without SRTP, even if signaling is encrypted, the media could be sent in clear text.

Answer

Disable SIP inspection on the firewalls.

Answer

Configure a VPN between the two clusters.

Answer

Enable MTP (Media Termination Point) for all calls.

Question 2

You have a requirement to use secure signaling for SIP endpoints. Which protocol and port combination must be used in the SIP Security Profile?

Accepted Answer

SIP TLS 5061. SIP TLS on port 5061 is the standard secure signaling transport for SIP endpoints in Cisco Unified Communications Manager. The SIP Security Profile in CUCM requires selecting TLS as the transport with port 5061 so that SIP signaling is encrypted with certificates between the endpoint and the call agent.

Answer

HTTP 443

Answer

SIP TCP 5060

Answer

SRTP 5061

Question 3

In the context of collaboration design, what is the purpose of the 'Location' in CUCM?

Accepted Answer

Call Admission Control. In Cisco Unified Communications Manager (CUCM), a 'Location' is the configuration object used to implement Call Admission Control (CAC). It defines the total bandwidth available between groups of devices, typically representing a WAN link between sites. When a call is placed between devices in different Locations, CUCM checks whether sufficient bandwidth exists in both Locations before allowing the call to proceed.

Answer

Defining physical building layouts

Answer

Device registration grouping

Answer

TFTP file distribution

Question 4

An administrator needs to verify that the Webex Hybrid Calendar Service connector is running and healthy. Where in Webex Control Hub should the administrator check the status of the connector?

Accepted Answer

Services > Hybrid Services > Calendar. The correct location to verify the health of the Webex Hybrid Calendar Service connector is Services > Hybrid Services > Calendar in Webex Control Hub. This page provides the connector status, version, and any alerts. Administrators can also restart or troubleshoot connectors from here, making it the central monitoring point.

Answer

Users > Manage Users

Answer

Organization Settings > Hybrid

Answer

Devices > List Devices

Question 5

A collaboration engineer is designing QoS for a Cisco Collaboration deployment where IP phones connect to Cisco Catalyst switches and the WAN edge is a Cisco IOS XE router. The engineer wants to ensure that voice bearer traffic is properly marked and prioritized end to end. Which two actions should the engineer take to establish a consistent QoS trust boundary? (Choose two.)

Accepted Answer

Configure a priority queue for voice bearer traffic on the WAN egress interface.. A consistent trust boundary requires the access switch to accept the phone's DSCP or CoS marking so voice keeps its EF value, and the WAN egress interface to provide a strict priority queue for that marked bearer traffic. Together these steps preserve marking from the endpoint and guarantee low latency across the constrained WAN link, which is the foundation of an end-to-end collaboration QoS design.

Answer

Configure the WAN router to re-mark all traffic entering from the LAN to DSCP 0.

Answer

Configure the access switch to trust CoS only on the WAN router uplink.

Answer

Configure the IP phones to mark all traffic, including PC data, as EF.

Question 6

Which TWO of the following are valid types of Media Resources in CUCM?

Accepted Answer

Music on Hold Server. In Cisco Unified Communications Manager, Media Resources are the software or hardware components that provide media-processing functions for calls, and the two valid types listed here are the Music on Hold (MOH) Server (option A) and the Conference Bridge (option B). A Music on Hold Server is a media resource because it streams audio to callers placed on hold, and it is configured under Media Resources > Music On Hold Server in CUCM. A Conference Bridge is likewise a media resource because it mixes the audio streams of multiple participants in a conference call, and it appears under Media Resources > Conference Bridge. The other options are not media resources: a Calling Search Space (C) is a dial-plan construct that defines which partitions a device or line can search for call routing, a Route Group (D) is a list of gateways or trunks used for route-list selection in call routing, and a Translation Pattern (E) is a dial-plan element that manipulates the called-party number before routing. None of C, D, or E perform any media processing, so they do not qualify as Media Resources in CUCM.

Answer

Calling Search Space

Answer

Route Group

Answer

Translation Pattern

Question 7

A Cisco Unified CM cluster is configured with a SIP trunk to a Cisco Unified Border Element (CUBE). Calls from the PSTN arrive at CUBE and are sent to CUCM. The ITSP requires that the From header contain the original calling number in E.164 format, but CUCM is sending it in a 10-digit national format. You need to ensure the From header is rewritten to include the +1 prefix. Which configuration on CUCM will accomplish this?

Accepted Answer

Configure an Outbound Calling Party Transformation Pattern on the SIP trunk that prepends +1.. The calling party number in the From header of an outbound SIP message can be manipulated using an Outbound Calling Party Transformation Pattern on the SIP trunk. This pattern matches the current calling number and can prepend +1, ensuring the ITSP receives the number in E.164 format. This approach is native to CUCM and does not require scripting.

Answer

Modify the SIP Profile assigned to the trunk to enable 'Use Fully Qualified E.164 Number'.

Answer

Create a Translation Pattern that matches the 10-digit number and adds the +1 prefix, then apply it to the trunk's inbound CSS.

Answer

Create a SIP Normalization Script that adds the +1 to the From header on the SIP trunk.

Question 8

When a SIP phone initiates a call, which message does the CUCM send to acknowledge the initial INVITE?

Accepted Answer

100 Trying. When a SIP phone sends an INVITE to CUCM, CUCM immediately returns a 100 Trying provisional response to stop the phone from retransmitting the INVITE while CUCM processes the request. This is defined in RFC 3261 as a provisional (1xx) response indicating the request has been received and is being processed. It is not a final response and does not indicate the call is ringing or answered.

Answer

401 Unauthorized

Answer

180 Ringing

Answer

200 OK

Question 9

A collaboration engineer is implementing a dial plan that requires all calls to emergency services (911) to be routed over a specific SIP trunk to a dedicated PSAP gateway, regardless of the calling device's location. Which CUCM configuration element should be used to ensure this routing?

Accepted Answer

A Route Pattern for 911 in a partition that is included in the calling search space of all devices, with the route pattern pointing to a route list containing only the PSAP gateway SIP trunk. To ensure that all emergency calls route over a specific SIP trunk, the 911 route pattern must be placed in a partition that is included in the calling search space of every device. The route pattern should point to a route list that contains only the PSAP gateway SIP trunk. This guarantees that any device dialing 911 will match the pattern and be routed to the dedicated trunk. The other options either do not guarantee universal access or misuse configuration elements.

Answer

A Route Pattern for 911 with the 'Route This Pattern' option and a 'Calling Search Space' that includes the PSAP partition

Answer

A dedicated Route Pattern for 911 that points to a Route List containing only the PSAP gateway SIP trunk

Answer

A Transformation Pattern that modifies the dialed number to a unique prefix and routes based on that prefix

Question 10

Where do you configure the time zone for a specific set of devices, such as those in a specific branch office?

Accepted Answer

Date/Time Group. The time zone for a specific set of devices, such as those in a branch office, is configured using a Date/Time Group in CUCM. A Date/Time Group defines the time zone and date/time format, and it is assigned to devices via device pools. This allows different groups of devices to have different time zones based on their location.

Answer

Region

Answer

Enterprise Parameters

Answer

Location

Question 11

Which of the following is a key advantage of utilizing Cloud Connected PSTN (CCP)?

Accepted Answer

It eliminates the need for on-premises PSTN gateways.. Cloud Connected PSTN (CCP) is a Cisco Webex Calling feature that connects your cloud phone system directly to a service provider's PSTN network in the cloud, bypassing the need for local gateways. This eliminates the hardware, maintenance, and configuration overhead of on-premises PSTN gateways, allowing calls to be routed entirely over the internet. It simplifies deployment and scales easily, which is the key advantage.

Answer

It allows for legacy analog phone support without an ATA.

Answer

It provides free long-distance calling globally.

Answer

It requires no internet connection.

Question 12

Which CUCM service must be activated in Serviceability to allow for the use of the 'Cisco Extension Mobility' feature?

Accepted Answer

Cisco Extension Mobility. The 'Cisco Extension Mobility' service is a dedicated feature service in Cisco Unified Serviceability that must be activated on the Cisco Unified Communications Manager (CUCM) cluster. Activating this service enables the Extension Mobility feature, allowing users to log in to any phone and have their personal directory number, speed dials, and services applied. Without this service running, the Extension Mobility login and logout functions will not work, even if the feature is configured in CUCM Administration.

Answer

Cisco DB Replicator

Answer

Cisco TFTP

Answer

Cisco CallManager

Question 13

When using Webex Calling with the Local Gateway, which protocol is used for the SIP trunk between the CUBE and the Webex Calling cloud?

Accepted Answer

SIP. The SIP trunk between the CUBE (Cisco Unified Border Element) and the Webex Calling cloud uses SIP (Session Initiation Protocol) for signaling. Webex Calling's Local Gateway architecture relies on SIP over TLS to establish and manage calls between on-premises CUBE and the Webex cloud. This is the standard protocol for Webex Calling PSTN connectivity.

Answer

H.323

Answer

SCCP

Answer

MGCP

Question 14

A company is deploying a centralized Cisco Unified Communications Manager (CUCM) cluster with a single publisher and two subscribers. The publisher is located in the data center, and the subscribers are in the same data center. Branch offices connect via a WAN. The design team wants to ensure that IP phones at the branches can register and make calls even if the WAN link fails. Which CUCM feature should be implemented to achieve this?

Accepted Answer

Cisco Unified Survivable Remote Site Telephony (SRST) on the branch router. SRST is the correct solution because it enables branch routers to provide call processing when the centralized CUCM becomes unreachable due to WAN failure. It allows IP phones to fall back to the router for basic calling, including PSTN access. Other options either provide different functions (CME, CUBE) or are for remote access (Expressway) and do not address WAN survivability.

Answer

Cisco Expressway-C and Expressway-E for Mobile and Remote Access (MRA)

Answer

Cisco Unified Border Element (CUBE) at the branch

Answer

Cisco Unified Communications Manager Express (CME) on the branch router

Question 15

Which configuration in Control Hub allows you to define the emergency address for a user in a Webex Calling environment?

Accepted Answer

Location Settings.. In Webex Calling, emergency addresses are defined at the Location level in Control Hub. Each location has an associated emergency address that is used for emergency calls (e.g., 911). User profiles, device settings, and organization settings do not directly define emergency addresses; they inherit from the location. The correct answer is D.

Answer

User Profile Settings.

Answer

Device Settings.

Answer

Organization Settings.