John Watson's blog
Part of my job is teaching for Oracle University, and I'm often asked about OCP exam technique. Here are a few hints. The OCM exam is very different, and the confidentiality rules forbid me from discussing it, so please don't ask.
This note is an attempt to summarize some of the 11gR2 facilities that allow for greater virtualization of resources, reducing reliance on networking facilities supplied by the operating system. All corrections welcome.