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Implementing and Operating Cisco Security Core Technologies (SCOR) · Cisco
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Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
C. external user and relay mail authentication is definitively correct. The exhibit is effectively a Cisco Secure Email Gateway/ESA example of LDAP SMTPAUTH used to authenticate external users so they can relay mail. Cisco’s own document is titled “Configure LDAP SMTPAUTH To Authenticate External Users and Relay Mail” and contains the same log sequence: an inbound ICID, successful TLS, then SMTP Auth ... AUTH mechanism: LOGIN with profile: ldap_smtp, followed by processing under the outbound mail table.
should be B. below shows: Example of what it should look like in the mail_logs when there is a successful relay with TLS enabled. Wed Sep 12 07:59:39 2007 Info: New SMTP ICID 36 interface Management (172.19.0.146) address 10.251.21.126 reverse dns host unknown verified no Wed Sep 12 07:59:39 2007 Info: ICID 36 ACCEPT SG SUSPECTLIST match sbrs[none] SBRS None Wed Sep 12 07:59:41 2007 Info: ICID 36 TLS success protocol TLSv1 cipher DHE-RSA-AES256-SHA Wed Sep 12 07:59:41 2007 Info: SMTP Auth: (ICID 36) succeeded for user: jsmith using AUTH mechanism: LOGIN with profile: ldap_smtp
You can find the explanation with the same example of log snippet here https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118545-technote-esa-00.html So the correct answer is C