Securing Email with Cisco Email Security Appliance (SESA) — Question 71

An administrator notices that the Cisco ESA delivery queue is consistently full. After further investigation, it is determined that the IP addresses currently in use by the Cisco ESA are being rate-limited by some destinations. The administrator creates a new interface with an additional IP address using virtual gateway technology, but the issue is not solved. Which configuration change resolves the issue?

Answer options

• A. Use the CLI command alt-src-host to set the new interface as a possible delivery candidate.
• B. Use the CLI command loadbalance auto to enable mail delivery over all interfaces.
• C. Use the CLI command deliveryconfig to set the new interface as the primary interface for mail delivery.
• D. Use the CLI command altsrchost to set the new interface as the source IP address for all mail.

Correct answer: B

Explanation

The correct answer is B, as using the CLI command loadbalance auto allows mail delivery to be distributed over all available interfaces, thereby improving delivery performance. The other options either do not activate load balancing or incorrectly configure the interfaces, which would not solve the underlying issue of rate-limiting.