Here you have the best Cisco 300-820 practice exam questions
Which complication does a NAT introduce in SDP for a SIP call?
In the context of SIP calls, NAT (Network Address Translation) can cause issues related to the IP address specified in the connection data field within the SDP (Session Description Protocol). If the client is behind a NAT, the IP address in the SDP might be a private, unrouteable internal address. This means that the receiving client will not be able to directly route packets back to the originating client, leading to communication failures.
A company already has a Cisco Unified Communications Manager for internal audio and video traffic, but it requires video communication with external partners and customers. It is important to ensure security for the deployment and the connectivity.
What must be set up to enable this requirement?
To enable secure video communication with external partners and customers while ensuring security for the deployment and connectivity, Cisco Expressway-C and Cisco Expressway-E are required. Cisco Expressway-C is deployed inside the corporate network and Cisco Expressway-E is deployed in the DMZ (Demilitarized Zone). This setup allows for secure traversal of firewalls and NAT (Network Address Translation) devices, thus ensuring both connectivity and security for external video communication with the Cisco Unified Communications Manager.
When an Expressway-E is configured for static NAT, which Session Description Protocol attribute is modified to reflect the NAT address?
When an Expressway-E is configured for static NAT, the Session Description Protocol (SDP) c-line is modified to reflect the NAT address. The c-line specifies the connection information, including the IP address where media should be sent. If a device is behind a NAT, the c-line will be updated to show the public NAT address to ensure proper routing of media packets.
A company is installing Cisco Collaboration infrastructure and one of the requirements is that they must be able to communicate with many external parties that are using H.323 and SIP. Internally they want to register the endpoints only on SIP.
Which functionality would describe the feature that needs to be enabled and where to achieve this?
Interworking is the required functionality to enable communication between SIP and H.323 protocols. The company wants to register endpoints internally using SIP and communicate with external parties using SIP and H.323. Expressway-C is designed to handle interworking between SIP and H.323, facilitating communication between these different protocols. Therefore, enabling interworking in Expressway-C would be the correct approach.
What is a key configuration requirement for Hybrid Message Service High Availability deployment with multiple IM and Presence clusters?
For a Hybrid Message Service High Availability deployment with multiple IM and Presence clusters, it is essential to have the Intercluster Sync Agent working across all IM and Presence clusters. This configuration ensures that data is synchronized properly among the clusters, which is critical for maintaining high availability and consistent service.