Which service is enabled on a Cisco router by default that can reveal significant information about the router and potentially make it more vulnerable to attack?

Which service is enabled on a Cisco router by default that can reveal significant information about the router and potentially make it more vulnerable to attack?

• FTP
• LLDP
• CDP
• HTTP

Explanation: CDP is a Cisco proprietary protocol that gathers information from other connected Cisco devices, and is enabled by default on Cisco devices. LLDP is an open standard protocol which provides the same service. It can be enabled on a Cisco router. HTTP and FTP are Application Layer protocols that do not collect information about network devices.

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