Which of the following should the network administrator do to rule out any problems at Layer 1?

A telecommunications provider has just deployed a new OC-12 circuit at a customer site. While the circuit showed no errors from the provider end to the customer’s demarcation point, a network administrator is trying to determine the cause of dropped packets and errors on the circuit.

Which of the following should the network administrator do to rule out any problems at Layer 1? (Choose two.)
A . Use a loopback at the demark and router, and check for a link light
B . Use an OTDR to validate the cable integrity
C . Use a pinout tester to validate the cable integrity
D . Use a multimeter to validate the cable integrity
E . Check for any devices that may be causing EMI on the cable
F . Clean the cables to be sure they are free of dust and debris

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Answer: AB