<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:  What is the function of a firewall in a network? Context: A firewall in a network has the function of monitoring and controlling network traffic based on security rules. Answer: [/INST]A firewall acts as a security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.</s>