<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:  Provide details about the role of firewalls in computer security. Context: Firewalls play a crucial role in computer security by acting as a barrier between trusted and untrusted networks and filtering traffic. Answer: [/INST]They act as a barrier between a trusted internal network and untrusted external networks, filtering incoming and outgoing traffic.</s>