자료를 보다 설명이 괜찮은 듯 하여 소개해 드립니다.
모든 통신 사업자는 다른 사업자와 연결을 통해 인터넷 세상과 통하게 될텐데요.
그 방법으로 2가지 타입이 있습니다.
Transit is when the lower level operators buy access to the upstream operator's whole network. This means that transit agreements provide access to all the nodes in the upstream operator's routing table and it is the upstream operator's responsibility to provide connectivity to the whole Internet for the lower level operators.
Peering, on the other hand, is a bilateral agreement between two operators to access each other's customers. No monetary compensations are paid by either of the operators. Peering agreements are not transitive, which means that the operators can only access each other's customers but not the rest of the network
Tier 1 network operators have full-coverage of the Internet and do not buy transit services from other network providers. Tier 2 network operators are regional and local operators that buy the transit service from Tier 1 operators and sell the connection to the consumers
