The Interconnection Security Agreement (ISA) primarily details what?

• A. How the interconnection is established or maintained.
• B. Data encryption algorithms.
• C. User access control policies.
• D. Physical installation procedures.

Answer: (A)

An ISA is about how two organizations or systems are connected and kept secure over time. It sets up the process for establishing the link, maintaining it, and eventually disconnecting it, including who is responsible for security controls, how the connection will be monitored, and how incidents and changes will be handled. This focus on the method and ongoing management of the interconnection is why the option describing how the interconnection is established or maintained is the best fit.

Data encryption specifics, while important, are typically addressed as security controls within broader agreements or separate documents, not the primary purpose of the ISA. Similarly, user access policies pertain to who can access the systems, rather than the interconnection itself, and physical installation procedures deal with hardware setup rather than the ongoing security relationship between the connected parties.