Please Answer the Following Questions in 200 - 350 words.
1. Describe and evaluate magnetic disk systems, include disk arrays.
2. Compare mobile OSs including iOS and Android.
3. Network Management MIB: Describe the network management object MIB and Describe the representation of the "SNMP" object.
4. 4G LTE: Describe the major features of 4G LTE.
5. WLAN security protocols: Describe the following three WLAN security protocols:WEP, WPA and WPA2. What are the major differences among WEP, WPA, and WPA2?