Technical data

166 Agilent Connectivity Guide
7TCP/IP Network Basics
TCP/IP Layers The TCP/IP network model is based on the
Department of Defense (DoD) model.
TCP/IP Protocol Overview This table summarizes the components
of each layer and shows the applicable Request for Comments (RFC)
for each component.
Figure 57 Functions of the TCP/IP Layers
Application
Transport
Internet
Network Interface
Application Layer
Contains applications that
process requests from other
hosts on the network.
Transport Layer
Determines if sender and receiver
hosts will set up a connection
(before communicating). Sets
how hosts will acknowledge
connection with each other.
Internet Layer
Responsible for addressing and
routing of packets.
Network Interface Layer
Defines how a host connects to
the network.
Layer Component Name Description Specification
Internet IP - Internet Protocol The lowest level protocol by which data are sent
from one computer to another on the Internet.
RFC 791*
RFC 2460**
ICMP - Internet Control
Message Protocol
A message control and error-reporting protocol
between IP devices on a network.
RFC 792
ARP - Address
Resolution Protocol
A protocol for translating IP addresses into
Ethernet addresses.
RFC 826
Transport TCP - Transmission
Control Protocol
A connection-oriented protocol running over IP
that reliably delivers data.
RFC 793
UDP - User Datagram
Protocol
A datagram-oriented protocol running over IP RFC 768