To read more than 900 pages takes time and motivation.
Mr Jang, Mr Orsaria and their proofreaders did a good job: there are very few typos and the quality is there.
Except the lack of coverage of the LDAP server configuration, very useful for testing the client side, all the topics are explained at considerable length and in a pretty expert manner.
Also, the awkward KVM presentation of the previous edition has been seriously improved.
Finally, I’ve got only one critic: all the configurations assume the RHEL 7.0 version. When the exams move to RHEL 7.1 or RHEL 7.2, you will have to buy a new edition (hopefully, this may never happen!).