Annex A. WLAN(802.11b/DSSS) Specifications OfficeServ 500 Wireless LAN Service Manual/Ed.00Annex A-8 © SAMSUNG Electronics Co., Ltd.5 Quality of Service (QoS)QoS refers to the capability of networks that reduces the traffic volume of networksor reserves some bandwidth. Network administrators provide their networks withQoS in many ways. QoS does not mean 100% assurance of bandwidth or 0 % ofpacket loss rate. However, QoS enables network administrators to send specifictraffic much faster or reserve network bandwidth. Network administrators canmanage the transmittance of traffic more efficiently than before.QoS is the capability of networks that meets the service level of a specific applicationof networks. The simplest QoS sends network traffic according to the priority oftransmittance and prior traffic is transmitted first.6 SecurityIn wireless communication, data might leak or impersonation might be happen.Therefore, MAC sub-layer is using encryption. Many Access Point(AP) productshave filtering function in the bridge or router of upper layer due to the MAC addressof the station.According to IEEE802.11, encryption is made by combining 40 bits or 104 bitsbutton generated by 24 bits key and RC4 algorithm of RSA at each station. This iscalled Wired Equivalent Privacy(WEP).IEEE802.11 indicates that WLAN might be decoded due to long interception becausekeys are fixed at stations. Therefore, the strict implementation of WEP is discussed inIEEE802.11i. IEEE discusses procedures for authentication on wireless LAN andEthernet to prescribe them in IEEE802.1x standard.
