Yes, u can use AFBR-709SMZ (PAN-SFP-PLUS-SR ) on the palo alto, and MA-SFP-10GB-SR on the Meraki 425. Because the SFP+ transceivers u use is standard recommend for the network device. And they are SFP+ ports that should be able to communicate just fine. Since DAC is a low-cost and low-power option, why not try SFP+ DAC for replacing SFP+ transceivers and MMF?
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