we are planning to purchase Cisco WS 3850 XS-S 1G/10G SFP+ 24 Port switch at access layer we are having Cisco 2960X 48 Port switch with 4*1G SFP Modules can we plug in 1G SFP modules in cisco WS 3850 XS-S 1G/10G SFP+ 24 Port Switch to communicate wit...