Company ABC is implementing a point-to-point bridging solution to a building approximately 3
kilometers (1.86 miles) away. The equipment used will be two autonomous access points set to
frequency 2412 Mhz with external antennas. The bridge link will be authenticated using an
external RADIUS server. While looking at the interface statistics, the network administrator
observes duplicate frames in the receive counters. What is most likely the root cause of these
duplicate frames?

A.
The antennae are not installed on the primary port.

B.
The counters on interface dot11radio1 are most likely due to the RF signal being corrupted by
an outside interference source.

C.
The non-root bridge is failing the authentication process and, as a result, sending and receiving
intermittently.

D.
The distance parameter is not configured.

E.
There is no clear LOS between the two buildings. The access points need to be mounted on
higher masts to obtain the proper clearance.