Question: In a GPRS network using GTP across the Gn and Gp interface, what is the requirement for the Internet Protocol (IP) used for IP Headers?
Option 1: Compliant with IETF RFC 2001, specifically designed for mobile networks
Option 2: A custom protocol developed by 3GPP for telecom operators
Option 3: Compliant with a combination of IETF RFCs (791, 2001, etc.) for flexibility
Option 4: Compliant with IETF RFC 791, the standard Internet Protocol specification
Explanation: The correct answer is Option 4 because the IP used must be compliant with IETF RFC 791, ensuring interoperability and adherence to the widely accepted standard for Internet Protocol. This compliance guarantees that GTP messages can be efficiently routed across different networks, emphasizing the importance of standardization in telecommunications.