Feel a bit silly for asking this because I feel it might be obvious.
Do Ethernet frames always contain src/dst IP addresses or only when needed? And when a src/dst IP address is added it gets encapsulated before the frame header correct?
I ask because I started learning about overlay protocols like OTV and VXLAN where I keep imagining the frame that already contains a src/dst IP address is then encapsulated by yet another IP header with a src/dst IP address.
Just bugging me is all and surprisingly tough to find a clear answer on this. Thanks for your patience.
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