(a)Explain what a MAC address filter is, and how it can be used as a security mechanism in WiFi. Also explain at least two limitations of using them. [3 marks]
(b)In WPA-Personal (CCMP), AES is used for encryption. Consider the key size used by AES in WPA-Personal, and the typical passphrase selected by home users. Discuss the differences (e.g. differences in length, character sets, and how the passphrase is converted to a AES key), and discuss a potential brute force attack on WPA-Personal on home deployments. [3 marks]
For each part: 3 marks if demonstrate a good understanding of the issues with accurate descriptions and explanations. 2 marks of minor mistakes or minor misunderstandings. 1 mark if missing important information or a significant mistake.