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question about ISP

I'm little bit confused about how ISP companies deliver their service across border , what protocol do they use and which OSI layer ?

Does anybody have information about this matter ?
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Mikrotiker
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Mikrotiker
1 Solution
 
Jan SpringerCommented:
The Internet is made of of autonomous systems.

Each of those systems has a number: an ASN (autonomous system number).

Each ASN has IP addresses (prefixes) that they need to announce to other providers.

They exchange this information via BGP (tcp port 179) in layer 3.
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