Learning BGP, Module 2 Lesson 4: Best Path

This installment of Russ White's BGP course discusses how the BGP protocol calculates the best path for a route. Topics include:
-Routes to discard
-Weighting
-Shortest AS path
-Origin type
-Multi-Exit Discriminator (MED)
-Oldest eBGP Path
-Tiebreakers
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[@furkanunal977]

Hi Russ,
The one thing that i confused about BGP is MED behavior.
If iBGP advertises a MED it goes until border, but if i understand correctly, if we don't explicitly define a MED policy to eBGP peer, that MED value will be zero on eBGP peer.
I can not find this kind of clear explanation