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Cisco 300-820: Which configuration must happen enable the communication between two separate Expressway-C servers 

Question

An engineer must enable the communication between two separate Expressway-C servers to allow inbound and outbound calling between different endpoints registered on each server. Which configuration must happen?

A. Configure a traversal zone on each server with a destination of the other Expressway-C.
B. Configure a neighbor zone on each server with a destination of the other Expressway-C.
C. Configure a transform on each server to strip the port numbers at the end of the alias.
D. Configure a transform on each server to convert the calling alias into the called alias.

Answer

B. Configure a neighbor zone on each server with a destination of the other Expressway-C.

Explanation

The correct answer is B. Configure a neighbor zone on each server with a destination of the other Expressway-C.

A neighbor zone is a type of zone that allows two Expressway servers to communicate with each other and route calls between them. A neighbor zone can be used to connect two Expressway-C servers that are in the same network or in different networks. A neighbor zone can also be used to connect an Expressway-C server with an Expressway-E server, a Unified CM server, or a third-party SIP server.

To configure a neighbor zone on each Expressway-C server, the engineer must specify the following parameters:

  • Zone name: A descriptive name for the zone, such as “Expressway-C-1 to Expressway-C-2”.
  • Zone profile: The type of zone, which should be set to “Neighbor”.
  • Peer address: The IP address or hostname of the other Expressway-C server.
  • SIP port: The port number used for SIP signaling, which is usually 5060 for TCP or UDP, or 5061 for TLS.
  • Transport: The transport protocol used for SIP signaling, which can be TCP, UDP, or TLS.
  • SIP URI: The SIP URI of the other Expressway-C server, which is usually the same as the peer address.

The other options are incorrect because:

  • A. Configure a traversal zone on each server with a destination of the other Expressway-C. This is false because a traversal zone is not used to connect two Expressway-C servers, but rather to connect an Expressway-C server with an Expressway-E server. A traversal zone allows an Expressway-C server to traverse firewalls and NAT devices and communicate with external endpoints through an Expressway-E server.
  • C. Configure a transform on each server to strip the port numbers at the end of the alias. This is false because this is not necessary to enable communication between two Expressway-C servers. A transform is a rule that modifies the SIP headers or URIs of incoming or outgoing calls. A transform can be used to change the format, domain, or prefix of an alias, but not to strip the port numbers.
  • D. Configure a transform on each server to convert the calling alias into the called alias. This is false because this is not necessary to enable communication between two Expressway-C servers. A transform can be used to change the alias of a call, but not to convert the calling alias into the called alias. This would result in a loop or an error, as the calling alias and the called alias would be the same.

Implementing Cisco Collaboration Cloud and Edge Solutions 300-820 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Implementing Cisco Collaboration Cloud and Edge Solutions 300-820 exam and earn Implementing Cisco Collaboration Cloud and Edge Solutions 300-820 certification.

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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