Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

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"

http://www.cisco.com/web/learning/netacad/demos/CCNA2v3Demo/ch1/main.html

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

Thanks...


4 REPLIES

Re: What type of wan connections need routing?

Ip needs to be routed.

Sent from Cisco Technical Support iPad App

Super Bronze

Re: What type of wan connections need routing?

Disclaimer

The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

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?

Thanks...

What type of wan connections need routing?

Hi

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.

299
Views
0
Helpful
4
Replies