To facilitate the troubleshooting process, which inbound ICMP message should be permitted on an outside interface?

To facilitate the troubleshooting process, which inbound ICMP message should be permitted on an outside interface?

• echo request
• time-stamp request
• echo reply
• time-stamp reply
• router advertisement

Explanation: By allowing the ICMP echo reply message inbound to the organization, internal users are allowed to ping external addresses (and the reply message allowed to return).

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