Which Linux command is commonly used to view or configure network interfaces?

• A. Ls -l
• B. Ssh
• C. Ping
• D. Ifconfig

Answer: (D)

Viewing and configuring network interfaces on a Linux system is done with a command that can display each interface’s status and allow you to assign addresses and enable or disable interfaces. That command is ifconfig. It lists interfaces, their IP address, netmask, and MAC address, and you can set an IP address with syntax like ifconfig eth0 192.168.1.10 netmask 255.255.255.0, or bring an interface up or down with ifconfig eth0 up or ifconfig eth0 down. This makes it the go-to tool for quickly inspecting and configuring interfaces. The other options don’t directly manage interfaces: ls -l lists files, ssh is for remote login, and ping checks connectivity to a host. Keep in mind that newer Linux systems use the ip command from iproute2 for similar tasks, but ifconfig remains a widely recognized and taught tool for this purpose.