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What type of wan connections need routing?

"The principal function of a router is routing. Routing occurs at the network layer, Layer 3, but if a WAN operates at Layers 1 and 2, is a router a LAN device or a WAN device? The answer is both, as is so often the case in the field of networking


When  a router uses the physical and data link layer standards and protocols that are associated with WANs, it is operating as a WAN device. The primary WAN roles of a router are therefore not routing, but providing connections to and between the various WAN physical and data-link standards"

So what type of wan connections/protocols  need  routing? What type of doesn't need??



Re: What type of wan connections need routing?

Ip needs to be routed.

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Re: What type of wan connections need routing?


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It's not so much what kind of WAN interfaces/protocols need routing, it's a question of whether you're making a L3 forwarding decision.  For instance, Etherent is L2, and can be used for "WAN" connections, yet we might route acoss Ethernet within a LAN while not route across Ethernet running across a WAN.

New Member

What type of wan connections need routing?

Can you please be more specific?


What type of wan connections need routing?


the question is not what type of connection is routed or not.

Most common Higher Level Protocol today is IP / IPv6 this protocol normaly would be routed. To limit broadcast domains to the local area.

On the other hand you have protocols like Systems Network Architecture (SNA) they will normaly bridged.

If you want to know more about this you might want to read "Routing TCP/IP Volume I" from Jeff Doyle, Jennifer Caroll and Computer Networks from Andrew S. Tannenbaum.

Mr. Tannenbaum handel the major kinds of networks in use or used in the past years.