What is the difference between an Ethernet interface on a router and sub-interface on a router?
Ethernet is the physical interface which you can see on the router. But at times we need some more interfaces which can be done using sub-interfaces. These are only logical interfaces. So if you do show interfaces on the router you can make out physical interface E0/0 from sub interface E0/0.1 or E0/0.2. Sub-interfaces are used for creating more than one subnets, etc. A single, physical interface can be logically divided into multiple, virtual sub-interfaces.
This was last published in February 2005
Dig Deeper on Network Infrastructure
Managed and unmanaged network switches differ in various ways, including control and cost. Managed switches support more granular control, yet ...
Unmanaged Linksys switches don't know where to send BootP and DHCP requests. Find out what to do to fix the problem of unmanaged switches and DHCP ...