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In C++, there is no built-in array "boundary" checking, which means the compiler does not restrict you from writing or accessing data outside the assigned array bounds.

When the boundary checking mechanism is not present, writing or accessing data outside the allocated array bounds can lead to various issues such as: 1. Unpredictable behavior: Writing or reading from memory locations outside the array can introduce unexpected results and lead to disruptively undefined behavior. 2. Security vulnerabilities: Inadvertently writing to memory locations outside the authorized array limits can expose sensitive information and make the program vulnerable to security threats and attacks. 3. Program crashes: Accessing a region of memory that hasn't been allocated or is forbidden can cause segmentation faults and other errors, leading to program crashes.

To prevent these issues and ensure proper boundary checking while using arrays in C++, you can follow these best practices: 1. Utilize container classes: Consider using standard C++ container classes such as 'vector' or 'array' in place of traditional C-style arrays. These containers provide built-in safety mechanisms such as boundary checking, automatic resizing, and other useful features. 2. Manually check array indices: Always make sure to validate the array indices before using them to access or set data in the array. You can do this by checking if the index is within the valid bounds of the array (between 0 and array length - 1). 3. Perform testing: Test your code thoroughly to expose potential issues with array boundaries. Remember to follow these best practices and be extra cautious with memory management while using arrays in C++.