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Can a Cisco 1720 router support two separate networks and share a dsl internet connection?

My network is currently using a simple dlink dsl router for internet connectivity.  I need two subnets and I need them to use the same dsl connection for internet access.  I have a win 2k domain with 24  clients.  I have a 1720 router.  What kind of WAN connection do I need? (Do I have to have an ADSL WIC card or will something else work?) Can I use an ethernet card in one of the WIC slots so that I can connect a second network?  Help.
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All computers are currently on the same network.  I want to set up a test lab that will be separate from the production network.  If I screw up something on the test lab I don't want it to affect the production network.  I am trying to do this on a limited budget.

A few questions:

Will the cisco 1720 support VLANs?  If yes wouldn't I need switches that also supported VLANs?  I do not have this.  Currently I have 1 hub and 1 cisco 1912  switch that does not support VLANs (standard ed.).

I currently have a modem attached to my dsl router WAN port.  What would my modem attach to on the 1720, I assume a ENET WIC?  Thanks for your help.
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I just looked at a router on ebay that claims to have dsl/cable connectivity but it only has a DSU T1 WIC.  How is this possible?  I have seen this more than once.  I am confused?  My 1720 has a dsu t1 wic.  If I need to buy a card, do I buy a enet wic or a adsl wic?  which is cheaper and which is easier to setup.  Thanks.
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I can get a WIC1E from another company for free.  The only problem is that it is 10baseT.  Is this enough bandwidth for a WAN connection supporting 24 users?  Users regularly connect to the internet mostly for email and surfing.  I sometimes use this connection to download updates for the computers on the network.  Also is a WIC1E the same as a WIC ENET?
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mottie

1720 does NOT support VLANs (I know this because I have one)

"The Cisco 1721 offers many significant feature enhancements over the Cisco 1720 router, including: greater memory architecture, faster processing, and 802.1Q VLAN support."

I am attempting to set up two VLANS on a Cisco 2924xl and have a Cisco 1720 router.  I can only bring one VLAN up at a time.  How can I use this single interface to feed both VLANS.  My router doesnt seam to have subinterface capabilities.  Am I simply two sheets to the wind?
As far as I know you're going to have to either purchase another interface, or buy a different router. It may be possible if you have enough flash/memory, but I know 802.1Q is not supported on my 1720 with the basic feature set.