The unprotected chain consists of four network elements: NE1.NE2.NE3 and NE4. Create an end- to-end VC4 path NE1-NE4. Add NE5 between NE2 and NE3 for capacity expansion. The original configuration…

The unprotected chain consists of four network elements: NE1.NE2.NE3 and NE4. Create an end- to-end VC4 path NE1-NE4. Add NE5 between NE2 and NE3 for capacity expansion. The original configuration remains unchanged. No service is configured on NE5. In this case, the unprotected chain becomes NE1-NE2-NE5-NE3-NE4, how many VC4 paths can be searched out?