Version 4.1 - 2.0 WCCP
WCCP [Web Cache Communication Protocol] is actually something that appears as a CCNP R/S topic - so I've been dealing with this material for a long time. I'm really thinking that out of all these topics, questions on WCCP would be very general if they even do appear. Granted, I know why this would end up being important for CCIE Security, but I think the emphasis would be more on implementation of it at a functional level rather than knowing every last nuance that would be needed in every situation.
In the Cisco WCCP Configuration Guide, it lists the required and optional tasks. The ones I think are most pertinent are:
*Specifying a Version of WCCP (Optional)
*Configuring a Service Group Using WCCPv2 (Required)
*Using Access Lists for a WCCP Service Group (Optional)
*Setting a Password for a Router and Cache Engines (Optional)
Using the command "ip wccp version {1 | 2}" is optional - because WCCPv2 is the default.
The command "ip wccp password password" is used to enable MD5 authentication.
Another page for WCCP - WCCP for Release 12.4T goes a bit deeper on some of the related topics.
Important notes:
WCCPv1 supports the redirection of HTTP (TCP port 80) traffic only.
WCCP works only with IPv4 networks.
Layer 2 redirection requires that content engines be directly connected to an interface on each WCCP router.
WCCPv2 allows redirection of traffic other than HTTP (TCP port 80 traffic), including a variety of UDP and TCP traffic.
The content engines in a service group specify traffic to be redirected by protocol (TCP or UDP) and up to eight source or destination ports.
The WCCP Increased Services feature increases the number of services supported by WCCP to a maximum of 256 across all VRFs.
This one's going to be short and sweet. Three more topics to go and section 2.0 is done.