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When replacing a Cisco Secure Firewall high-availability (HA) device due to a failure, the first step the engineer must take is to unregister the secondary (failed) device from the Cisco Secure Firewall Management Center (FMC). This action separates the HA pair and ensures that the new replacement device can be registered and configured correctly.

Steps:

Access the FMC and navigate to the device management section.

Unregister the failed secondary device to remove it from the HA pair.

Register the replacement device to the FMC.

Reconfigure the HA settings to restore the high-availability configuration.

By unregistering the failed device first, the engineer ensures a clean setup for the replacement device, avoiding potential conflicts or issues in the HA configuration.

https://www.cisco.com/c/en/us/td/docs/security/asa/asa910/configuration/firewall/asa-910-firewall-config/access-sfr.html

Inline tap monitor-only mode (ASA inline)—In an inline tap monitor-only deployment, a copy of the traffic is sent to the ASA FirePOWER module, but it is not returned to the ASA. Inline tap mode lets you see what the ASA FirePOWER module would have done to traffic, and lets you evaluate the content of the traffic, without impacting the network. However, in this mode, the ASA does apply its policies to the traffic, so traffic can be dropped due to access rules, TCP normalization, and so forth.

To allow access to a specific banking site over HTTPS, the network administrator must use SSL decryption (also known as SSL/TLS inspection) and specify the URL. This is because HTTPS traffic is encrypted, and the firewall needs to decrypt the traffic to inspect the URL and enforce the access rule.

Steps:

Enable SSL Decryption: Configure SSL policies to decrypt the HTTPS traffic.

Specify the URL: Define the URL of the banking site in the access control policy, ensuring that the decrypted traffic is inspected and allowed based on the specified URL.

This method ensures that only the desired banking site is accessed over HTTPS, while other HTTPS traffic can be filtered or blocked according to the organization's security policies.

To collect 24 hours' worth of data using a packet capture on a Cisco Secure Firewall Threat Defense (FTD) appliance without prematurely stopping due to buffer size limitations, the engineer should increase the packet capture buffer size. The default buffer size is 32 MB, which is insufficient for extended captures.

Steps:

Access the packet capture configuration on the FTD device.

Increase the buffer size to 1 GB, which provides a significantly larger capacity for capturing packets over a 24-hour period.

Setting the buffer size to 1 GB should accommodate a substantial amount of traffic and prevent the capture from stopping prematurely.

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