The system network communicates by using TCP/IP network protocols for LAN and WLAN communication. Commercial RF CMOS products are also used for Bluetooth and Wireless LAN (WLAN) networks. FHSS systems tend to disturb other types of wireless communication systems such as WiFi/WLAN. It provides an authentication mechanism to devices wishing to attach to a LAN or WLAN. A Portal provides access to the WLAN by non-802.11 LAN STAs. The company also operates WLAN, UMTS and LTE(4G) networks in Poland. Products using the IEEE 802.11 WLAN standards are marketed under the Wi-Fi brand name . Cantennas are typically used for extending a wireless local area network (WLAN). The security of wireless networks (WLAN) is thus an important subject. The most prominent are short range radio technologies like WLAN (either standard Wi-Fi or ZigBee). They are suitable for various applications such as RFID, WLAN . Using the example of WLAN/GSM roaming, the following scenarios can be differentiated (cf. Older systems that provide WLAN functionality include DECT and HIPERLAN. This stands for WLAN Authentication and Privacy Infrastructure. Some smartphones can also act as a mobile WLAN access point.