Which two statements about Cisco SGSN are true? (Choose two.)

Question

Options

• ACisco SGSN can support 2G or 4G Cisco SGSN instances on a single Cisco ASR 5000
• BCisco SGSN adheres to defined 3GPP standards for mobility management, packet data, and
• CCisco SGSN supports paging, authentication, and P-TMSI reallocation
• DCisco SGSN supports single Cisco SGSN and GGSN instances on multiple Cisco ASR 5000

• A
  11% (3)
• B
  85% (23)
• D
  4% (1)

Explanation

B is correct because the Cisco SGSN is fully standards-compliant, adhering to 3GPP specifications for mobility management, packet data services, and SMS - this is a fundamental design requirement for interoperability with other carrier equipment. C is correct because paging (locating idle devices), authentication (verifying subscriber identity), and P-TMSI reallocation (periodically reassigning temporary identities for privacy/security) are core SGSN functions defined in 3GPP standards.

A is wrong because SGSN is a 2G/3G technology - 4G networks use the MME (Mobility Management Entity), not an SGSN; the correct pairing would be 2G and 3G instances on a single ASR 5000. D is wrong because the Cisco ASR 5000 platform is designed to support multiple SGSN (and GGSN) instances on a single chassis, not single instances spread across multiple chassis - the whole value proposition is chassis consolidation.

Memory tip: Remember "PAP = what SGSN does" - Paging, Authentication, P-TMSI reallocation (option C), and that SGSN is a 3GPP standards-based node (option B). If an answer mentions "4G" alongside SGSN, it's a trap - SGSN stops at 3G.

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