Which SecureXL template is enabled by default on a Security Gateway?

The SecureXL template that is enabled by default on a Security Gateway is the Accept template. This template allows for the efficient processing of packets that match defined rules where the action is to accept. By default, SecureXL focuses on improving throughput and performance for permitted traffic, which is essential for maintaining high performance in environments with significant data flow.

SecureXL is designed to optimize traffic handling by bypassing certain processing for packets that meet the accept criteria, thus allowing the gateway to process these packets more swiftly. This is vital for ensuring that legitimate connections are handled quickly without unnecessary latency, which can occur if every packet were subjected to full inspection.

When considering the other choices, they represent different actions or states that may not be enabled by default. The Drop template specifically handles traffic that should not be allowed through the firewall, while the NAT template deals with network address translation processes. An option that suggests "None" would imply no templates are active, which is not practical as SecureXL aims to enhance performance right from the start by allowing accepted traffic to be processed efficiently.

In summary, the default enabling of the Accept template in SecureXL is crucial for efficient traffic flow and performance on a Security Gateway.