Question: Which of the following signalling messages is not integrity protected after the security mode set-up procedure?
Option 1: RRC Connection Request
Option 2: Paging Type 1
Option 3: RRC Connection Setup Complete
Option 4: MM Messages
Explanation: According to the 3GPP TS 33.102 specification, all dedicated MS <–> network control signalling messages shall be integrity protected after the security mode set-up procedure, except for certain specific messages. Among the options provided, Paging Type 1 is one of the exceptions mentioned in the specification, and therefore it is not integrity protected.