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v TCP/IP Network Model
The TCP/IP network model is a 4 layered
model that describes how different protocols interoperate. In order to send
data from one host to another.
§
Application
Layer
Each application has specification for
communications for so that clients and servers may communicate across platforms.
§ Transport Layer
Transport protocols are TCP and UDP is a
reliable connection-oriented protocol whereas UDP is unreliable connection less
protocol.
§ Internet Layer
The Internet or Network layer carrier data
from source host to destination host.
§ Access (Link) Layer
The link or media access layer provides the
connection to physical media.
v Socket
The combination of the service port and IP
address from a socket.
v Ports and Services
TCP
service use sockets as end points for communication and are made up of an IP
address, protocol, and port number. Service typically listed on standard ports
while clients use a random port available port number.
There are total 65536 port numbers and range
is 0 to 65535.
v It sends & echo massage (-c4)
§
For IPv4
#
ping ɸ –c ɸ 4 ɸ 192.168.1.1 ↵
§
For IPv6
#
ping6 ɸ –c ɸ 4 ɸ 2001:db8:0:1:1 ↵
v LAN interface
§
To show IP address
#
ifconfig ↵
#
ip ɸ addr ɸ show ɸ ens3 ↵ (ens3 =
interface name)
§ To enable
interface
#
ifup ɸ ens3 ↵
§ To disable
interface
#
ifdown ɸ ens3 ↵
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