The Unix-based tool commonly used to configure network interfaces and IP addresses is:

• A. Ifconfig
• B. Netsh
• C. Ipconfig
• D. Nmtui

Answer: (A)

Configuring network interfaces from the command line on Unix-like systems is traditionally done with a dedicated interface configurator. Ifconfig is the classic tool for this purpose, designed to set an interface’s IP address and netmask and to bring interfaces up or down. For example, you can assign an IP to a specific interface with a command like: ifconfig eth0 192.168.1.10 netmask 255.255.255.0 up. While many modern Linux systems now use the ip command from iproute2 for more advanced network management, ifconfig remains the traditional Unix-era utility closely associated with configuring interfaces and their addresses. In contrast, Netsh is a Windows tool for configuring network settings, ipconfig is the Windows command used to display IP configuration (and renew in some cases), and Nmtui is a text UI for NetworkManager rather than a direct low-level interface configuration utility.