* Open System * Shared Key * IEEE 802.1X
Open authentication requires a password. Pre-shared keys do not require a password.
Shared key
There are many types of authentications can be used in access wireless network. mainly 3 types are used: User only Authentication, Device Only Authentication, User+Device Authentication. They are self explanatory.
Setting up your router's wireless security is the best way to prevent other people from using your wireless Internet connection. Your Linksys router supports three (3) of the most commonly used wireless security types: WEP, WPA and WPA2 Personal. WEP is out dated. Try the using WPA and WPA2 wireless security setting types
Open system authentication (default).
I think one is database server authentication, the other is operating system level authentication (could be at the network level).
L2TP is a tunneling protocol for an IP network. L2 data is transmitted over the network but has no encryption or authentication abilities. This type of protocol is usually paired with IPSec to provide encryption and authentication.
In a network, devices and information can be shared by desktop users.
shared
pap
authentication