Which of the following attack vectors are addressed by Xinetd and TCP Wrappers? (A) Outsider attack from network (B) Outsider attack from a telephone (C) Insider attack from local network (D) Attack…

Choice A omits insider attacks from the local network (C), but TCP Wrappers filter by IP address regardless of whether the source is external or internal, so they do address local network threats.

Xinetd and TCP Wrappers operate at the network socket level, inspecting and filtering TCP/UDP connection requests based on the source IP address or hostname. This directly blocks unauthorized outsiders attacking over a network (A) and insiders attacking from the local network segment (C), since both vectors involve IP-based network connections that these tools can evaluate and deny.

Telephone-based attacks (B) bypass IP-based controls entirely because they exploit dial-up or modem interfaces, not TCP/IP network sockets that Xinetd or TCP Wrappers monitor.

Previously installed malicious code (D) runs with local user or system privileges and does not arrive as an inbound network connection, so host-based network wrappers have no mechanism to detect or block it.