AP Computer Science Principles Exam (Units 1 through 4) 100% Pass

AP Computer Science Principles Exam (Units 1 through 4) 100% Pass What is the purpose of `IP addresses`? IP addresses identify devices on the Internet and allow them to communicate with each other. What does `DNS` do? DNS translates domain names (like ) into IP addresses so browsers can load websites. What is `packet switching`? Packet switching breaks data into small packets that travel across networks independently, then reassemble at the destination. What is `binary` and why is it used in computers? 2 Binary is a base-2 number system using 0s and 1s. Its used because computers operate using two states: on (1) and off (0). How does `data compression` help? Data compression reduces the size of files so they take up less storage and transfer faster. What is the difference between `lossy` and `lossless` compression? Lossy compression reduces file size by removing some data (e.g., JPEG), while lossless keeps all the data (e.g., ZIP files). What is an `algorithm`? An algorithm is a step-by-step set of instructions for solving a problem. Why are `loops` important in programming? 3 Loops repeat a set of instructions until a condition is met, making programs more efficient by automating repetitive tasks. What does `debugging` mean?