Critical Thinking

History suite (TCP/IP) is developed for data transferring.

History of
Internet

The first network is created with the
creation of ARPANET in 1969.After that many networks are were developed (NPL
network ,Tymnet ,CYCLANDES ,Telenet).

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The Internet protocol suite (TCP/IP)
is developed for data transferring.

This
allowed to communicate several computers through one network.

 

Organizations in creating/maintaining internet standards

·       
W3c

 World Wide Web Consortium is
known as W3c.

They are the ones who maintaining and modifies HTML.

·       
IETF

 Internet Engineering Task
Force is known as IETF. It is for develop internet standards.

·       
Isoc

Internet society (Isoc) is a non profitable volunteer
organization that makes internet standards.

·       
IAB

Interactive Advertising Bureau (IAB) is an advertising business organisation,
it’s a non profitable organisation. They give advices for online advertising
and they develops its standards.

 

Importance of layers in TCP/IP

There are four layers
in the architecture in internet communication. This protocol defines how data
how data is received and sent through the network.  

1.  
Application

2.  
TCP-Used
in transport layer

3.  
IP-Used
in network layer

4.  
Data
Link

 

DNS
Resolution

What is a DNS? Its called Domain Name System.

When a device(Computer, Smart phone, Smart tv etc.) connected
to a computer network, the network system gives a unique numeric number for
it.It is called as an ip address. (192.168.50.251)

When we trying to reach a website by typing a web address
DNS comes to the middle of the  procedure
, DNS converts that web address into a IP address.That is called DNS
resolution.Most of the time its done by a DNS server.

 

Firewalls
and Proxy Servers

·       
Firewall

Is a method
used for protect out devices from the threats coming from a network

It can be a
software or a hardware component.

It
restricts the flow of network and logs about the dropped packets. It can filter
incoming and outgoing packets.

 

 

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