An engineer wants to configure a zone on the Expressway-E to receive communications from the Expressway-C in order to allow inbound and outbound calls. How is the peer address configured on the…

The correct answer is A. Expressway-E FQDN. When Expressway-E operates with a single NIC and static NAT, it has one internal IP address that is mapped to an external/public IP via NAT on the firewall. Expressway-C must reach Expressway-E using its externally resolvable FQDN, which resolves to the public (NATted) IP…

Initial Expressway Configurations

Question

An engineer wants to configure a zone on the Expressway-E to receive communications from the Expressway-C in order to allow inbound and outbound calls. How is the peer address configured on the Expressway-C when Expressway-E has only one NIC enabled and is using static NAT mode?

Options

AExpressway-E FQDN
BCisco UCM FQDN
CExpressway-E DHCP
DCisco UCM DHCP

How the community answered

(39 responses)

A
90% (35)
B
3% (1)
C
3% (1)
D
5% (2)

Explanation

When Expressway-E operates with a single NIC and static NAT, it has one internal IP address that is mapped to an external/public IP via NAT on the firewall. Expressway-C must reach Expressway-E using its externally resolvable FQDN, which resolves to the public (NATted) IP address. Using an FQDN is the correct and recommended approach because it abstracts the IP mapping and works reliably with static NAT. Configuring a raw IP might cause issues if NAT translations change, and DHCP addresses are not appropriate for server infrastructure like Expressway-E. UCM addresses are irrelevant to this zone peer configuration.

Topics

#Expressway Zones#Expressway-C Expressway-E Communication#Static NAT#Peer Address Configuration

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