CORRECT TEXT
To change your Ethernet interface eth0 to the IP address 10.4.4.100 with a default class C subnet mask, type the full command string to accomplish this.
Answer: ifconfig eth0 10.4.4.100 netmask 255.255.255.0
Explanation:
Alternative correct Answer
ifconfig eth0 10.4.4.100 netmask 255.255.255.0 up
With the option up – you set these inferface active.