2
TCP/IP (Transmission Control Protocol/Internet Protocol)
“TCP/IP” is a set of protocols for data communication over the Internet,
centering around the TCP and IP.
TCP/IP became a standard protocol with the spread of the Internet, and is
often referenced today in describing the structure of the OSI model.
OSI model
Layer 7
Application layer
Layer 6
Presentation layer
Layer 5
Session layer
TCP/IP model
Application layer
Main protocols
SMTP,
POP3,
HTTP,
FTP,
Telnet,
SNMP
Transport layer
Transport layer
TCP, UDP
Layer 3
Network layer
Internet layer
IP
Layer 2
Data link layer
Layer 1
Physical layer
Network interface
layer
CSMA/CD, PPP
Twisted pair, coaxial, fiber
optic
TCP
UDP
:
:
:
:
:
:
:
:
IP
:
CSMA/CD :
PPP
:
Sends or transfers e-mail to a mail server.
Retrieves e-mail from a mail server.
Transfers files that are marked in HTML.
Transfers files.
Provides remote operation of computers over a network.
Manages communications equipment that is connected to a
network over the network.
Provides reliable end-to-end data transfer services.
Provides high-speed data transfer services, but end-to-end
does not guarantee reliability.
Provides routing functions.
Monitors the usage of communication paths, and provides
data transfer by detecting open transmission paths.
Connects computers to a network over a phone line. Frequently used for dial-up connections.
Reference
POP3
Abbreviation for “Post Office Protocol
version 3.”
Reference
HTTP
Abbreviation for “HyperText Transfer
Protocol.”
Reference
FTP
Abbreviation for “File Transfer Protocol.”
Reference
SNMP
Abbreviation for “Simple Network Management Protocol.”
Reference
TCP
Abbreviation for “Transmission Control
Protocol.”
Technology element
SMTP
POP3
HTTP
FTP
Telnet
SNMP
Abbreviation for “Simple Mail Transfer
Protocol.”
Chapter 9
Layer 4
Reference
SMTP
Reference
UDP
Abbreviation for “User Datagram Protocol.”
Reference
IP
Abbreviation for “Internet Protocol.”
Reference
CSMA/CD
Abbreviation for “Carrier Sense Multiple
Access with Collision Detection.”
Reference
PPP
Abbreviation for “Point-to-Point Protocol.”
Reference
HTTPS
“HTTPS” is a protocol that combines
HTTP with data encryption functions
based on SSL.
Abbreviation for “HyperText Transfer
Protocol Secure.”
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