ASA Botnet Traffic Filter

C.

The ASA Botnet Traffic Filter feature is a security mechanism that allows the ASA firewall to identify and block network traffic associated with known botnets. Botnets are groups of infected computers that are controlled remotely by attackers to perform malicious activities such as sending spam, launching DDoS attacks, stealing sensitive data, and spreading malware.

Regarding the categories of the ASA Botnet Traffic Filter feature, the correct statement is option C, which says that "Known malware addresses: These addresses are identified as blacklist addresses in the dynamic database and static list." This means that the ASA firewall has a database of known malicious IP addresses and domain names that are used by botnets. The database is continuously updated dynamically and can also be supplemented with a static list of malware addresses.

When the ASA firewall detects traffic that matches one of the addresses in the database, it can either drop the traffic or alert the administrator, depending on the configuration. The aim is to prevent the infected computers from communicating with the botnet command-and-control servers and to mitigate the risk of network compromise and data theft.

Option A, which describes unlisted addresses, is incorrect because the ASA Botnet Traffic Filter feature only blocks traffic that matches known malicious addresses in the database, so unlisted addresses are not blocked by default.

Option B, which describes ambiguous addresses, is incorrect because the ASA Botnet Traffic Filter feature does not rely on domain names but on IP addresses, and it does not have a graylist of addresses.

Option D, which describes known allowed addresses, is incorrect because the feature is designed to block malicious traffic, not to allow it. Whitelist addresses are usually allowed by other mechanisms such as access control lists (ACLs).