public void setProtocol(String protocol) {
        this.protocol = protocol;
    }
<p>
The network connection protocol observed in the activity that prompted GuardDuty to generate the finding.
</p>

@param protocol
       The network connection protocol observed in the activity that prompted GuardDuty to generate the finding.
aws-java-sdk-guardduty/src/main/java/com/amazonaws/services/guardduty/model/DnsRequestAction.java