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HTTP
Hypertext Transfer Protocol (HTTP) is a protocol that used to transfer or convey
information on the World Wide Web (WWW).
HTTP defines how messages are formatted and transmitted, and what actions
Web servers and browsers should take in response to various commands. The
other main standard that controls how the World Wide Web works is HTML,
which covers how Web pages are formatted and displayed.
Any Web server machine contains, in addition to the Web page files it can serve,
an HTTP daemon, a program that is designed to wait for HTTP requests and
handle them when they arrive. The Web browser is an HTTP client, sending
requests to server machines. An HTTP client initiates a request by establishing a
Transmission Control Protocol (TCP) connection to a particular port on a remote
host (port 80 by default). An HTTP server listening on that port waits for the client
to send a request message.
HTTPS
HTTPS is an acronym for Hypertext Transfer Protocol over Secure Socket Layer.
It is used to indicate a secure HTTP connection.
HTTPS provide authentication and encrypted communication and is widely used
on the World Wide Web for security-sensitive communication such as payment
transactions and corporate log-ons.
HTTPS is really just the use of Netscape's Secure Socket Layer (SSL) as a sub-
layer under its regular HTTP application layering. (HTTPS uses port 443 instead
of HTTP port 80 in its interactions with the lower layer, TCP/IP.) SSL uses a 40-bit
key size for the RC4 stream encryption algorithm, which is considered an
adequate degree of encryption for commercial exchange.
I
ICMP
Internet Control Message Protocol (ICMP) is a protocol that generated the error
response, diagnostic or routing purposes. ICMP messages generally contain
information about routing difficulties or simple exchanges such as time-stamp or
echo transactions.
IEEE 802.1X
IEEE 802.1X is an IEEE standard for port-based Network Access Control. It
provides authentication to devices attached to a LAN port, establishing a point-to-
point connection or preventing access from that port if authentication fails. With
802.1X, access to all switch ports can be centrally controlled from a server, which
means that authorized users can use the same credentials for authentication
from any point within the network.
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