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Core Concepts – 25%

Within this topic, the applicants should prove that they are capable of performing the following tasks:

Describing the core Expressway settings (including network interfaces; certificates; DNS; QoS; network firewall rules; clustering);
Describing the function of TURN, STUNI, and ICE;
Describing Expressway media traversal;
Describing the Expressway backup as well as restoring procedure (cluster & stand alone).
Describing the complexities of NAT within a Collaboration environment;
Describing Expressway Licensing (including option keys; license consumption; release key);

Cisco Implementing Cisco Collaboration Hybrid and Cloud Technologies (CLHCT) v2.0 Sample Questions (Q68-Q73):

NEW QUESTION # 68
An engineer attempts to upload a server certificate to an Expressway-C server but receives an error when they click the upload button that says that the file is invalid. The engineer is advised that this happens because the certificate was signed incorrectly and is missing an attribute. What must the engineer do to upload the certificate?

A. Create a new certificate template with the certificate attribute "Allow private key to be exported" enabled and use this template when signing the Expressway server certificate.
B. Create a new certificate template with "Server authentication" and "Client authentication" enabled and use this template when signing the Expressway server certificate.
C. Create a certificate request via Certificate Services Web Page and ensure that the certificate validity period is five years because the Expressway server validates this during certificate import.
D. Create a certificate request via the Certificate Services Web Page and ensure that the Subject Common Name field contains the server FQDN and all Cisco Unified CM phone security profile names.

Answer: B

Explanation:
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/mra/exwy_b_mra-deployment-guide-x150.pdf

NEW QUESTION # 69
In a larger Cisco Collaboration deployment, a user requires the advanced file transfer function in Cisco Jabber while the client is using Mobile and Remote Access. The deployment has multiple Expressway clusters and internal Cisco UCM clusters. Which configuration must be applied on Cisco Expressway-C for this function to be available?

A. The HTTP Allow List must use Automatic update rules to include all Cisco UCM servers.
B. The HTTP Allow List must be manual or use Automatic inbound rules updated to include all Cisco IM and Presence servers.
C. The HTTP Allow List must use Automatic update rules to include all Cisco IM and Presence servers.
D. The HTTPS Allow List must be manual or use Automatic inbound rules updated to include all Cisco IM and Presence servers.

Answer: B

Explanation:
For the AFT feature to work across Expressway, make sure that all Unified CM IM and Presence Service nodes are on the allow list, whether manually or automatically added.
Automatic Inbound Rules
Edit the HTTP Allow List
Upload Rules to the HTTP Allow List
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-
5/exwy_b_mra-expressway-deployment-guide/exwy_b_mra-expressway-deployment- guide_chapter_01000.html#task_FED878914C77C914B5FD7C7108F5CDCE

NEW QUESTION # 70
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. Write a custom normalization script since the "vcs-interop" normalization script does not allow registrations
B. Change the "Incoming Port" in the SIP Trunk Security Profile for the Expressway-C to not match SIP line registrations
C. Change the SIP profile on the SIP trunk for the Expressway-E to Standard SIP Profile for TelePresence Endpoint
D. Enable autoregistration for the appropriate DN range on the Cisco UCM servers running the CallManager service

Answer: B

Explanation:
In order to correct this issue, change the SIP port on the SIP Trunk Security Profile that is applied to the existing SIP trunk configured in CUCM and the Expressway-C neighbor zone for CUCM to a different port such as 5065.

NEW QUESTION # 71
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. SIP trunk to the DefaultZone
C. pipe to the DefaultZone
D. route pattern to the DefaultZone

Answer: A

Explanation:
Using Links and Pipes to Manage Access and Bandwidth.
You can also manage calls from unrecognized systems and endpoints by configuring the "links" and "pipes" associated with the Default Zone. For example, you can delete the default links to prevent any incoming calls from unrecognized endpoints, or apply pipes to the default links to control the bandwidth consumed by incoming calls from unrecognized endpoints.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/admin_guide/X14-0-
2/exwy_b_cisco-expressway-administrator-guide-x1402/exwy_m_zones-and-
neighbors.html#reference_AB9714D9A58AB2411A667F451A8ED9A5

NEW QUESTION # 72
Which set of actions configures ACME certificates on Expressways?

A. Configure ACME Certificate settings on your Expressway-C, and change the ACME automated scheduler field to OFF.
B. Configure ACME Certificate settings on your Expressway-E, disable the Expressway cluster, and change the ACME automated scheduler field to OFF.
C. Configure ACME Certificate settings on your Expressway-E, and change the ACME automated scheduler field to ON.
D. Configure ACME Certificate settings on your Expressway-C, and change the ACME automated scheduler field to ON.

Answer: C

NEW QUESTION # 73
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