参考文献

https://www.linode.com/zh/blog/networking/the-importance-of-ip-peering-in-cloud-computing/
中国四大骨干网和三大运营商网络是什么关系？ https://blog.csdn.net/sinat_36458870/article/details/129700238
大话中国骨干网 https://www.ithome.com/0/523/947.htm
中国大陆目前国际网络的建设状况 https://zhuanlan.zhihu.com/p/64467370
海外PCDN是否有足够收益？
海外边缘环境介绍
https://macronetservices.com/who-are-the-leading-global-tier-1-isps/
浅谈中国大陆各运营商链路 https://blog.alanyhq.com/archives/102
Autonomous System Relationship and Interdomain Routing https://www.omscs-notes.com/computer-networks/autonomous-system-relationships-and-interdomain-routing/
Tier 1 ISPs: What They Are and Why They Are Important https://www.gin.ntt.net/wp-content/uploads/2020/01/IDC_Tier1_ISPs.pdf

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