```
switch1#show interfaces descri
```

...

Fa0/13 up up

Fa0/14 down down

Fa0/15 up up

...

(the lights are also on on both ports 13 and 15)

However:

i.e. nothing for port 15!
How to determine the MAC address of this port or how to wake up the device? Once again, the lights on both ports are green.

switch1#show mac-address-table

24 x.dc15.93a9 DYNAMIC Fa0/13

24 x.9931.296d DYNAMIC Fa0/11

24 x.2196.cf24 DYNAMIC Gi0/1

24 x.a947.fb81 DYNAMIC Fa0/11

24 x.b954.90c2 DYNAMIC Fa0/8

24 x.b976.a45c DYNAMIC Fa0/2

24 x.8f1c.f11b DYNAMIC Fa0/11

24 x.ba8e.f467 DYNAMIC Fa0/11

28 x.2196.cf24 DYNAMIC Gi0/1

28 x.f08a.6025 DYNAMIC Fa0/20

28 x.f08a.6026 DYNAMIC Fa0/19

28 x.f08a.6027 DYNAMIC Fa0/22

21 x.2196.cf24 DYNAMIC Gi0/1

20 x.2196.cf24 DYNAMIC Gi0/1