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Connect Internet GB port to WAN ISP on Cisco 1921 Router ?

Connect Internet GB port to WAN ISP on Cisco 1921 Router ?

Lisa098
New Contributor
I want to upgrade 1841 router with T1 to Cisco 1921-SEC/K9 router . Do i need to purchase an HWIC Module or use one of the two internet GB ports as WAN port to ISP ?
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