Which logical interface is the communications path between the SGSN and the Cisco GGSN?

Question

Options

• AGn interface
• BIuPS interface
• CGi interface
• DMAP interface

• A
  92% (45)
• B
  4% (2)
• C
  2% (1)
• D
  2% (1)

Explanation

The Gn interface is the standardized communications path between the SGSN (Serving GPRS Support Node) and the GGSN (Gateway GPRS Support Node), carrying user data and signaling via the GPRS Tunneling Protocol (GTP) within the core network backbone. IuPS (option B) is incorrect - it connects the Radio Network Controller (RNC) to the SGSN in UMTS, sitting on the radio access side, not between core nodes. Gi (option C) is the interface on the other side of the GGSN - it connects the GGSN to external packet data networks like the internet, not to the SGSN. MAP (option D) is a signaling protocol (Mobile Application Part) used for inter-node communication such as HLR/VLR exchanges, not an interface name for the SGSN-GGSN path.

Memory tip: Think of Gi as the "Gateway to the Internet" (external), and Gn as the internal core link - the n stands for the iNternal backbone connection between your two GPRS support nodes.

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