When you have two "NAT routers". Whether double NAT or not. wall--RJ11--router-modem(RM)---LAN-WAN--router(R)----LAN--comps (A Router-Modem(RM) so no WAN port, And a router R which has a WAN port, and ...
Are two routers enough for practicing CCNA skills in your home lab? Maybe, maybe not. But you can practice a surprising number of CCNA-level router tasks with a two-router lab using the topology ...
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