<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  Provide a strategy for preventing unauthorized access to computer systems. Context: Preventing unauthorized access to computer systems can be achieved by implementing strong passwords and multi-factor authentication. Answer: [/INST]Implementing strong passwords and multi-factor authentication can help prevent unauthorized access.</s>