<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:  Summarize the role of firewalls in data security. Context: Firewalls play a crucial role in data security by acting as a barrier between a trusted network and an untrusted network. Answer: [/INST]It acts as a barrier between a trusted network and an untrusted network.</s>