LDAP

Port 389 talks to the local AD server, and can see the local AD tree. Port 3289 talks to the 'Global Directory' on the AD server - if the option is enabled, and can see the whole forest if you have more than one tree in the directory - of course the other trees would be on other servers - but the info is consolidated into one forest.

Jxplorer - good open source LDAP browser

sAMAccountName attribute is used to store user name in Active Directory

"protocol://hostname:port/base?attribute?scope?filter" NONE

http://www.jejik.com/articles/2007/06/apache_and_subversion_authentication_with_microsoft_active_directory/

SNMP

Find all OIDs, that can be monitored by device:
snmpwalk -v1 -c public 192.168.1.253 -m ALL .1


Package for Debian with mibs: snmp-mibs-downloader

• How to Collect CPU Utilization on Cisco IOS Devices Using SNMP


• Cisco SNMP Object Navigator


• SNMP technology information from Cisco


• Monitor RAM on Cisco via SNMP