When ACLs are configured to block IP address spoofing and DoS flood attacks, which ICMP message should be allowed both inbound and outbound?
- source quench
- echo
- unreachable
- echo reply
Explanation: Source quench ICMP messages provide the ability to have the sender throttle down the rate of messages when necessary. These messages should be allowed through the firewall in both inbound and outbound directions.
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