<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:  Describe the purpose of firewalls in computer security. Context: Firewalls in computer security act as a barrier to monitor and control incoming and outgoing network traffic. Answer: [/INST]It acts as a barrier to monitor and control incoming and outgoing network traffic.</s>