Step $4$: Configure host computers.

Configure the host computers Sales$-$A$,$ Sales$-$B$,$ QC$-$A and QC$-$B using any available IPv$4$ Address in the appropriate network. Set the IPv$6$ Addresses listed in the addressing table. Configure the default gateway $-$ as the appropriate router interface address.

Step $5$: Ensure connectivity

From each PC$,$ ensure you are able to ping every other PC$,$ each switch, and each router interface. Take corrective action to establish connectivity if a test fails: