# Overview zkLink modular stack provides unparalleled scalability for dApps building on top of our ecosystem. Each module of zkLink Nova can be upgraded independently, allowing us to have the capability to deliver the best performance by flexibly combining the best technologies. The network can be decomposed into four layers: * **Sequencing Layer:** Collect and order transactions. * **Execution Layer:** Process transactions and update states. * **Settlement Layer:** Finalize transactions on the base chains and execute fund withdrawal. * **Data availability(DA) Layer:** Ensure data is available. It is worth to note that our innovative multi-chain settlement scheme makes us the first aggregated Layer 3 rollup network connecting to Ethereum and multiple Layer 2 rollup networks (L2s) with Ethereum equivalent security. ## --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.zklink.io/architecture/overview.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.