The ISR 4321 only have two router ports - Network Engineering Stack Exchange
Cisco Integrated Services Rout / C - 30596&manufacturer_id=132... / Hayatspro
Cisco 4321 Integrated Services Router - Cisco
Cisco ISR4321/K9 Integrated Service Router
Cisco NIM-ES2-4= 4-Port Layer 2 Gigabit Ethernet NIM
Product Details
Cisco ISR4321/K9 – NW Remarketing Inc
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Keyspan 4321 4-port serial DB9 to USB adapter | eBay
Port Authority of Allegheny County 4321 West Library, Pitt… | Flickr
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50Mbps-100Mbps system throughput, 2 WAN/LAN ports, 1 SFP port