Hardware Reference
In-Depth Information
FIGURE 3.17
FileZilla is a popular FTP application
Like plain HTTP, the FTP protocol isn't secure. If you need secure fi le transfer, use a
security-enabled transfer method instead of plain FTP, such as
Secure Shell (SSH) FTP
,
sometimes called
Secure FTP (SFTP)
.
VoIP
Voice over Internet Protocol (VoIP)
is a set of applications, technologies, and protocols to
provide IP-based telephony services In other words, it lets you use the Internet to make and
receive “telephone” calls. From the end-user's standpoint, it's just another form of the same
telephone service they've always enjoyed, but the calls are all-digital. The analog data from
the person's speech is digitized, sent as data across the Internet, and then re-created as an
analog sound at the other end.
Many companies offer low-cost VoIP service to consumers, including Skype. In addition,
cable companies like Comcast offer digital phone service through their cable lines in
conjunction with Internet service.
