Final answer:
Base and limit registers provide memory protection and efficient memory access, but have limitations in addressing memory and additional instructions are required for accessing memory outside the defined section.
Step-by-step explanation:
Base and limit registers are used in computer architecture to define the boundaries of a section of memory, such as a program or data structure. The base register stores the starting address of the section, while the limit register holds the size of the section. The main advantages of using base and limit registers are memory protection and efficient memory access. However, there are also some drawbacks, such as the limited memory space that can be addressed and the need for additional instructions to access memory outside the defined section.