Say you have a L3 switch. One of the ports is routed (no switchport), and another is a switchport. Is it possible for devices coming off both ports to be in the same subnet? Can the devices coming off the switchport use the routed port as their default gateway?
(I'm trying to work out some theory in my head while studying for BCMSN)
NO, it can't fall under same subnet, because 1 is being the routing port & the other being a switch port, the PC which is connected on the switch port can't have the gateway ip address as the routing port interface ip address.
A PC connected to a routed port and a PC on a switchport cannot be in a same IP subnet. PC which is connected to a switchport has to be in a separate subnet which will be done by using the SVI L3 interface on the switch as the gateway for the PC. When a switchport PC ARP's for the routed port PC, the L3 SVI will proxy-arp for the routed port PC and that's how the communication will happen.
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