Nokia Certified Network Associate (NCNA) — Question 4

Which ATM adaptation layer is usually used for connectionless data service?

Answer options

• A. AAL1
• B. AAL2
• C. AAL3/4
• D. AAL5

Correct answer: C

Explanation

AAL3/4 is designed for connectionless data services, making it suitable for applications that do not need a dedicated connection. AAL1 is for constant bit rate services, AAL2 is for variable bit rate services, and AAL5 is primarily used for connection-oriented services, thus not fitting the criteria for connectionless data service.