show arp commands results should also show encapsulation type for the workstation. Default on Cisco Ethernet/Fastethernet is ARPA. If WkStation is NSAP then router cannot ping it, but workstation would be able to ping router. Moment workstation pings the router , router would make a note of its enacpsulation type and if you do show arp now, you will notice encapsulation for that wkstation as NSAP. Now router can also ping wkstation.
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