# MaxScale Protocols - [MaxScale Change Data Capture (CDC) Protocol](https://mariadb.com/docs/maxscale/reference/maxscale-protocols/maxscale-change-data-capture-cdc-protocol.md): Learn about the legacy CDC protocol in MaxScale. This guide covers the authentication and registration phases for clients consuming AVRO-formatted replication events. - [MaxScale Change Data Capture (CDC) users](https://mariadb.com/docs/maxscale/reference/maxscale-protocols/maxscale-change-data-capture-cdc-users.md): Manage user authentication for the legacy CDC protocol. This reference explains how to create, store, and manage user credentials for clients connecting to the CDC listener. - [MaxScale MariaDB Protocol Module](https://mariadb.com/docs/maxscale/reference/maxscale-protocols/maxscale-mariadb-protocol-module.md): Configure the core MariaDB client-server protocol in MaxScale. Learn about settings for compression, connection redirection, and replication support for standard database listeners. - [MaxScale NoSQL Protocol Module](https://mariadb.com/docs/maxscale/reference/maxscale-protocols/maxscale-nosql-protocol-module.md): Use MariaDB as a backend for MongoDB applications. This module allows MaxScale to accept MongoDB wire protocol commands and transparently convert them into SQL queries. --- # 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://mariadb.com/docs/maxscale/reference/maxscale-protocols.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.