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What is a Firewall:
Firewalls ar of two types:
-Hardware Firewall
-Software Firewall.
Firewall in simple musical mode is fundamentally the utility to provide the security over the network. These are the security measures that prevents the networks in and out traffic to pass finished the specific Security filters so that the unwanted and unsecure data digest be stopped from entering into the network..
further… as a security measure it also depends on the network architect and implementer that how to use a Firewall mean to ordain the security measures give care how to present the content filtering and URL filtering which type of firewall should be apply and where to put it..
 
Well.. first of all one should know what a protocol actually means:
A Protocol is basically set of rules designed and developed for the internetwork or can say intranetwork Communications. the need of TCP had been raised in early days when like.. IBM Mainframe was not able to Communicate with the Burroughs mainframe.. Means if you deprivation to connect 2 or more computers they should be similar with e very(prenominal)thing from manufacturer to designer and implementer…then TCP imerged as a solution-for-ever..
EARLIER it was NCP( Network Control Protocol) but later it nice into TCP( Transmission Control Protocol) and IP(Internet Protocol)on jan.1,1983..


Some General roles of TCP/IP are:
1.



Independence from particular vendor or network.
2. very low data overhead
3. good failure recovery.
and if the things are taken separately.. then
TCP is basically responsible for proper data contagious disease by assuring data integrity it is a contact oriented protocol that follows the under scenario
1. Handshaking.
2. Packet Sequencing
3. Flow Control.
4. erroneous belief handling.
IP : Since the data to be sent must be put somewhere the IP works here .. the inevitable data is packaged in an IP packet.
 
Layers
7 Application
6 Presentation Upper Layers
5 Session
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