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What are two facts about WSA HTTP proxy configuration with a PAC file? (Choose two.)
Correct Answer: C,D
A PAC file, or proxy auto-configuration file, is a script that tells the web browser how to use a proxy server for different URLs. A PAC file can be hosted on a web server or on the WSA itself, and can be deployed to the client web browser manually or automatically. A WSA HTTP proxy configuration with a PAC file is defined as an explicit proxy deployment, because the client web browser is aware of the proxy and sends requests to it directly. This is different from a transparent proxy deployment, where the client web browser is unaware of the proxy and the requests are redirected to it by a network device such as a router or a firewall. A bridge proxy deployment is a type of transparent proxy deployment where the WSA acts as a layer 2 bridge between two network segments and intercepts the traffic passing through it. A PAC file is not used in a bridge proxy deployment. In a dual-NIC configuration, the WSA has two network interfaces, one for the client-side network and one for the server-side network. The PAC file does not direct traffic through the two NICs to the proxy, but rather tells the client web browser to send requests to the proxy's IP address and port number. The WSA then forwards the requests to the server-side network through the other NIC. Therefore, option B is incorrect. References := Some possible references are: * 1: What is a Proxy Pac file and are there any examples? - Cisco * 2: What is a PAC file and where is it located on WSA? - Cisco * 3: [WSA Training Series] How to configure the HTTPS Proxy on the Cisco Web Security Appliance * 4: Proxy Auto-Configuration (PAC) file * 5: Use proxy auto-configuration (.pac) files with IEAK 11