<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:  Describe the structure of a network topology. Context: The structure of a network topology includes different types such as bus, ring, star, and mesh. Answer: [/INST]It includes different types such as bus, ring, star, and mesh.</s>