Which statement describes a valid use of a custom chain in RouterOS firewall?

• A. Organize our rules
• B. Increase throughput
• C. Encrypt rules
• D. Define default routes

Answer: (A)

Custom chains are used to organize firewall logic by function. In RouterOS you can create a named chain and jump to it from another chain, then return when done. This modular approach lets you group related rules together (for example, all SSH checks or all logging/drops) and reuse that set of rules from different places, which makes a complex policy easier to read, manage, and maintain. For instance, placing all SSH-related rules in a dedicated chain and jumping to it from the main INPUT chain keeps the overall rule set clearer. This is about organization and manageability, not about increasing throughput, encrypting rules, or defining routes in the routing table.