Pass the Cisco CCNP Security 300-720 Questions and answers with CertsForce

STARTTLS is an SMTP extension that allows email servers to negotiate a secure connection using TLS or SSL encryption. Cisco ESA supports STARTTLS for both inbound and outbound email delivery.

References: User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway, page 5-2.

Enabling regional scanning improves security for this organization when most of the received email originates from a specific region. Regional scanning is a feature that allows Cisco ESA to apply different spam thresholds and actions based on the geographic region of the sender’s IP address, using a database of IP addresses and regions.

To enable regional scanning on Cisco ESA, the administrator can follow these steps:

Select Security Services > IronPort Anti-Spam and click Edit Settings.

Under Regional Scanning, select Enable Regional Scanning.

Click Submit.

Select Security Services > IronPort Anti-Spam > Regional Settings and click Add Region.

Choose a region from the drop-down menu, such as Asia Pacific.

Enter a spam threshold and an action for that region, such as 80 and Drop.

Click Submit.

https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2019/pdf/BRKSEC-2240.pdf

A TXT record is a type of DNS record that contains arbitrary text data that can be used for various purposes such as verification, configuration, or authentication. A TXT record can contain the DKIM public key per RFC 6376, which is used to verify the digital signature of an email message generated by the DKIM private key of the sender domain.

The other options are not valid because:

A. A CNAME record is a type of DNS record that maps an alias name to a canonical name or another alias name. It does not contain any DKIM public key information.

B. An AAAA record is a type of DNS record that maps a hostname to an IPv6 address. It does not contain any DKIM public key information.

D. A PTR record is a type of DNS record that maps an IP address to a hostname, which is the reverse of an A or AAAA record. It does not contain any DKIM public key information.