<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: The firewall function in a network is to filter and control incoming and outgoing network traffic. Answer: [/INST]A firewall acts as a barrier to filter and control the incoming and outgoing network traffic.</s>