<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 function of a firewall in network security. Context: The function of a firewall in network security is to monitor and control incoming and outgoing network traffic based on predetermined security rules. Answer: [/INST]It monitors and controls incoming and outgoing network traffic based on predetermined security rules.</s>