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Once it infects a system, a __________ is very hard to detect, because it installs itself at a low level.

A(n) __________ sets up two TCP connections, one between itself and a TCP user on an inner host and one between itself and a TCP user on an outside host.

Performing regular backups is part of the __________ phase of securing an OS.

Typically the systems in the _________ require or provide external connectivity, such as a corporate Web server, an e-mail server, or a DNS server.

A denial-of-service attack is an attack on the _______ of a system or network resource.

If an adversary obtains a copy of a system’s password database, this will enable them to carry out a(n) ___________ attack to obtain system passwords.

Anomaly detection can be effective against zero-day attacks.

A personal firewall will by default reject all new ______ connections.

Reducing the number of open network ports on a server is an instance of minimizing the _________.

A firewall can protect against attacks that bypass the firewall.