What Layer 2 protocol can present a security risk when enabled on an untrusted interface?
A. CDP
B. Frame Relay
C. HDLC
D. PPP
A
Explanation: By default, Cisco devices (perhaps the most widely used) use a proprietary Layer 2 protocol called Cisco Discovery Protocol (CDP) to inform each other about their capabilities. If the CDP packets are captured, additional information can be obtained that can be helpful in mapping the network in advance of an attack.
Computer Science & Information Technology
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