| Exam 642-883 | Question id=3422 | OSPFv2 and OSPFv3 Routing in Service Provider Environments |
Which two OSPF network scenarios require OSPF virtual link configuration?
| A. |
to connect an OSPF non-backbone area to area 0 through another non-backbone area | |
| B. |
to connect an NSSA area to an external routing domain | |
| C. |
to connect two parts of a partitioned backbone area through a non-backbone area | |
| D. |
to enable route leaking from Level 2 into Level 1 | |
| E. |
to enable route leaking from Level 1 into Level 2 | |
| F. |
to enable OSPF traffic engineering |