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Router -> webfilter -> switch module?

First off I am by no means a network guru, any help would be awesome. Here is the scenario:

Comcast Metro ethernet device

Port 1 is WAN

Port 2 is link to building accross town

Cisco 2901 Router

GigE 0/0 -> Port 1 on Comcast CPE

GigE 0/1 -> Barracuda web filter

Barracuda web filter

WAN port -> GigE 0/1

LAN port -> switch

So as you can see the link to the other building has not been integrated yet. Here is what I need to accomplish to get both campus LANs behind the web filter:

Comcast Metro ethernet device

Port 1 is WAN

Port 2 is link to building accross town

Cisco 2901 Router

GigE 0/0 -> Port 1 on Comcast CPE

GigE 0/1 -> WAN port on Barracuda web filter

Barracuda web filter

WAN port -> GigE 0/1 on 2901 router

LAN port -> switch port 1 (or switch card?)

Switch (or switch card?)

port 1 -> LAN port on Barracuda

port 2 -> Port 2 on Comcast CPE to link accross town

port 3 -> other campus switch

First question, can I accomplish something like this using just a 4 port switch card for the router? As you can see I only need a few switch ports so a full switch seems like overkill but conceptually is easy to visualize. If I can use a switch card how would that work, what would the config look like? If I need to go with a full switch, what would that config look like?

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