Question : Log Network Activity

Hi:

I want to log my network connections/activity. For example, if someone hook his/her laptop to my LAN, it should be logged. How can I do this?

Answer : Log Network Activity

Syslogging on the switch will only give you up/down times of port activations. - The "when" and "where"
SNMP can give you the MAC address of everything connected "what"
802.1x /AAA authentication can give you the username "who" and block anyone that does not authenticate with a username/password
Nothing inherent in the switch will ever give you netbios names of systems connected. Unless it is a layer 3 switch it will not even know the IP address of the system connected.
You can try switchport mapper like the Solarwinds tool:
http://www.solarwinds.net/Tools/Network_Discovery/Switch_Port_Mapper/index.htm