Just as their customers pay them for Internet access, ISPs themselves pay upstream ISPs for Internet access. An upstream ISP usually has a larger network than the contracting ISP or is able to provide the contracting ISP with access to parts of the Internet the contracting ISP by itself has no access to.
ఏ సాధారణంగా ఒక పెద్ద నెట్వర్క్ కలిగి, కస్టమర్ యొక్క ISP లేదా అప్స్ట్రీమ్ ISP?
upstream ISPs