ISPs tier1, tier2 and tier3 Computer Networks

For any Querry please ask in comment box.
This is part of lecture first of computer networks.
Further lectures will be uploaded soon

[@dreampop626]

1:17 bless you

[@evansebenezerofficial2842]

The speeds are supposed to be much higher than 622 Mbps or 10 Gbps...It's tier 1 right isn't it supposed to have like 1Tbps speeds?? Just asking