<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 a firewall used for in network security? Context: A firewall is used for monitoring and controlling network traffic based on a set of rules in network security. Answer: [/INST]A firewall is used to monitor and control incoming and outgoing network traffic based on an applied rule set.</s>