An engineer is configuring Cisco Secure Web Appliance and needs to deploy it in transparent mode. Which configuration component must be used to accomplish this goal?

MDA (Malware Defense Appliance) is a type of appliance, not a configuration component for transparent redirection.

WCCP is a Cisco proprietary protocol that redirects traffic streams at Layer 3 to a group of web caches or appliances like the SWA, enabling transparent interception and processing of web traffic without client configuration changes. When configured on a switch or router, WCCP intercepts HTTP/HTTPS traffic and forwards it to the SWA, making the SWA transparent to end-users.

PBR (Policy-Based Routing) can redirect traffic but is not the primary or most common method for deploying a Cisco SWA in transparent mode; WCCP is specifically designed for this cache/proxy redirection.

DNS resolution on the Cisco Secure Web Appliance is part of its function but does not enable the transparent redirection of client traffic to the appliance itself.