I think that is more than 202 main focus, we must adhere to, and then come back for other related topics.
Pam knowledge, we must understand that examination.
CIDR how to cut subnet? What is 200.100.101.0/25 Although very simple, but must score (two items).
NIS, and the master server to understand the relationship between the slave server (a test that).
Dhcpd, it is necessary to understand how to set a range for the bootp or dhcp client (a test that).
Sshd impression that in a test, pay attention to ssh_config settings.
In ftp to do symbolic link, there will be any problem? (A test that)
Finally Chen:

Whether, I am surprised that, in lpi.org website, the importance of pam for only 2, but when the actual examination of the issues frequently arise pam, pam issues we must especially to the study, believe Whether you will Xiaokouchangkai.

Personally feel that the most difficult part of the troubleshuting, if you can make high I would like to have to work hard here, and this is my weakest areas.
Whether it is more than I share the experience of 117-202, but having said that, all examinations or in the general direction of the official website http://www.lpi.org/p-obj-202.html based LPI, and sometimes heard LPI will be updated from time to time by the 117-302 117-101 questions, all of the above to provide personal data only a small suggestion that the LPI level2 want to obtain some help.