Question: For Lawful Interception (LI) in a telecom network, what protocol is defined by IETF RFC 2126 for use on the application layer, in conjunction with BER on the presentation layer, specifically for HI2 delivery methods?
Option 1: ISO Transport Service on top of TCP (ITOT) - TPKT/TCP/IP
Option 2: File Transfer Protocol (FTP)
Option 3: ETSI TS 102 232-1 Encoding Scheme
Option 4: Internet Protocol Stack (IPStack)
Explanation: The correct answer is Option 1 because, according to the specifications for HI2 delivery methods in the context of Lawful Interception, IETF RFC 2126 defines the use of ISO Transport Service on top of TCP (ITOT), which is implemented as TPKT/TCP/IP, for its application layer and presentation layer (BER) roles.