| Toward the Practical Use of Network Tomography for Internet Topology Discovery Recent countries visiting this post |  |
 | 4 | United States |
 | 3 | |
 | 2 | China |
| Toward the Practical Use of Network Tomography for Internet Topology Discovery Recent countries visiting this post | |
| 4 | United States |
| 3 | |
| 2 | China |