Question: In a GPRS network supporting Mobile IPv4 services, where is the Foreign Agent (FA) functionality typically provided to efficiently support these services?
Option 1: In the Serving GPRS Support Node (SGSN)
Option 2: In the Mobile Station (MS: User Equipment)
Option 3: In a standalone node between the GGSN and the Internet
Option 4: In the Gateway GPRS Support Node (GGSN)
Explanation: To support Mobile IPv4 services efficiently in a GPRS network, the Foreign Agent (FA) functionality is integrated into the Gateway GPRS Support Node (GGSN). This integration allows for the mapping between the care-of IP address and the GTP tunnel within the PLMN, facilitating the tunneling/de-tunneling of datagrams between the Mobile Station (MS) and the Home Agent (HA), which resides outside the 3GPP scope.