One of problem from user Wireless Local Area Network ( WLAN) most important is problem security. With exploiting of technology wireless hence data sent unavoidably will pass ” free air”. With the condition threat to contents of its(the data enough big. Some threats to system WLAN is existence of crisis to danger of infiltration. Very the thing enabled by of infiltrator to have WLAN card hence meaning s(he has owned opportunity to step into network. With existence of above condition, hence required existence of network security of WLAN in layersly.

Segmentation of Network

With security model of segmentation of network WLAN, hence network WLAN is categorizing into separate subnet. Or with other solution of network WLAN is dissociated to network extranet.

SSID ( Service Set Identifier)

SSID is name of network from a network WLAN, and can be set as according to desire administrator. SSID is recognized also with term ESSID. Function Of SSID related to security and safety of WLAN is most important to security and safety system WLAN. Every client which will enter network WLAN or in circuit to AP hence having to knows SSID from AP.

SSID basically can be set broadcast and also no ( sees picture 2). If set [by] broadcast hence hardly easy to be known by user having WLAN card. All device ( notebook or personal digital assistant) with scanning network WLAN hence earning easily knows good WLAN network with software wafting WLAN card and also software other addition.

MAC FILTERING 

Security system which the third is by exploiting filtering MAC ( Medium Access Control) address. usually the setting in side AP there is choice about list MAC address which we input would, is for allow/disallow or forward all/block all category.

WEP ( Wired Equivalent Privacy) 

Wired Equivalent Privacy is encryption algorithm ( shared key authentication process) for autentikasi user and data encryption payload overcome through the network wireless. Thereby like its(the name, hence system WLAN is designed that be same his(its safe with network wired LAN. WEP applies algorithm Pseudo Random Number Generator ( PRNG) and RC4 stream chiper. Standard IEEE 80211 also specification of usage WEP.

By using this WEP technique, data package which will be sent encryption beforehand. Then the data package is sent to user authorization . Up to user package acceptor will be decryption to become data actually causing earns to be read again. For the existing of technology which to support encryption started out of 40 bits to 256 bits. 

Bit setting or character WEP is done in side AP and also in side client. Picture 4 shows setting WEP in AP. Number of characters ( secret key WEP) depended from bit amounts applied and its(the character type is ASCII or Hexadesimal. For example if applying WEP key in ASCII format, hence 5 character for 64 bits WEP and 13 characters for 128 bits WEP. But if(when WEP key in format HEX, hence 10 characters applied for 64 bits WEP and 26 characters for 128 bits WEP.

For setting in side client, hence first time user will see network WLAN ( SSID) what particular enabling user access. For example is picture 5. In drawing the seems to be some SSID one of them is RisTI Wireless LANs WEP ( only this just AP set by its(the WEP Maka after user chooses SSID RisTI Wireless LANs WEP, hence in [screen/sail] user would seems to be drawing 6. Thereby user must know WEP its(the key. 

WPA ( Wi-Fi Protected Access)

WPA is repair in side WEP. Has not all AP ( Access Point) supports fitur WPA, but usually AP output of the year 2003 upward. this same WPA of its(the function with WEP, that is as process for autorisation user and also does data encryption payload. WPA combines function from feature 8021x along with feature TKIP ( Temporal Key Integrity Protocol). 

The difference with ordinary WEP, hence secret its(the key doesn’t have the character of static but haves the character of dynamic. Thereby for the duration of certain of secret its(the key will change. However, for in side client, not necessarily make a change in manual ( user losts to if(when secret its(the key changes). 

VPN ( Virtual Private Number )