What is the network namespace in Linux used for?

What is the network namespace in Linux used for?

• A. Providing an isolated networking stack with its own IP addresses and connectivity
• B. Managing disk quotas
• C. Providing a separate user namespace
• D. Isolating processes via cgroups

Answer: (D)

A network namespace provides an isolated networking stack for a group of processes. Within a namespace, you get its own network interfaces, IP addresses, routing tables, and firewall rules, so the processes inside that namespace have a separate view of the network from processes in other namespaces. This is what lets containers or different sandboxed processes communicate through their own private networks without interfering with each other, and it’s common to see a container get its own IP and a virtual interface connected to the host network through a veth pair. It isn’t about disk quotas, a separate user namespace, or cgroups; those handle different kinds of isolation or resource control.

A network namespace provides an isolated networking stack for a group of processes. Within a namespace, you get its own network interfaces, IP addresses, routing tables, and firewall rules, so the processes inside that namespace have a separate view of the network from processes in other namespaces. This is what lets containers or different sandboxed processes communicate through their own private networks without interfering with each other, and it’s common to see a container get its own IP and a virtual interface connected to the host network through a veth pair. It isn’t about disk quotas, a separate user namespace, or cgroups; those handle different kinds of isolation or resource control.