The document discusses the Point-to-Point Tunneling Protocol (PPTP), which is used to send PPP packets over nonsecure networks like the internet. PPTP encapsulates IP packets for communication between remote users and networks. It clarifies the incorrectness of TCP, DHCP, and HTML in relation to tunneling.

1. Which protocol uses tunneling to send PPP packets over a nonsecure network such as the
Internet?
A. TCP
B. DHCP
C. HTML
D. PPTP
Solution
Answer D is the correct answer. The Point-to-Point Tunneling Protocol (PPTP) encapsulates IP
packets for transport over a public network. PPTP is used by remote access servers to support
communications between remote users and a private home or corporate network. Answer A is
incorrect because TCP is a Transport layer protocol and has no role in tunneling. Answer B, the
Domain Host Configuration Protocol, is used to assign and track IP address allocations on an IP
network and is not related to tunneling, so it's incorrect. Answer C is also incorrect because it is
a language used on the Internet's World Wide Web. HTML is basically ASCII text surrounded
by HTML commands.