| Inferring POP-Level ISP Topology through End-to-End Delay Measurement Recent countries visiting this post |  |
 | 4 | United States |
 | 1 | China |
 | 1 |
| Inferring POP-Level ISP Topology through End-to-End Delay Measurement Recent countries visiting this post | |
| 4 | United States |
| 1 | China |
| 1 |