title: CISCO Router Interface Coomands
body: <p>I am reading book 'CCNA Routing and Switiching  Study Guide - Lammle, Todd' wherein there was a command  to create an interface (int f0/0).</p>
  
  <p>On CISCO Router command when I am giving a command
  <code>Corp(Config)#int f0/0</code></p>
  
  <p>It is displaying error message as "<strong>Invalid interface type and number</strong>". Please help me with this command.</p>