+-----+                                        +-----+
| App |- - - - - - - - - -CC- - - - - - - - - -| App |
+-----+                +------+                +-----+
| EN  |------ CL ------|  QR  |------ CL ------| EN  |
|     |------ QL ------|      |------ QL ------|     |
+-----+                +------+                +-----+

App - user-level application
EN - End Node
QL - Quantum Link
CL - Classical Link
CC - Classical Channel (traverses one or more CLs)
QR - Quantum Repeater