Difference between IPv4 and IPv6

Characteristics	IPv4	IPv6
Deployed	1981	1999
Address Size	It uses 32 bit addresses	It uses 128 bit addresses.
Address Format	Dotted Decimal Notation: 192.168.1.1	Hexadecimal Notation: FFFE:F200:3204:0B00: 0122:4555:8001:AB00
Prefix Notation	192.168.1.1/24	2FFE:0200:6234::/48
Number of Addresses	232= ~4,294,967,296	2128 = ~340,282,366, 920,938,463,463,374, 607,431,768,211,456
Compatibility	It is less compatible to mobile networks.	It is much compatible to mobile networks.
Uses	It is used in 99% of the networks.	It is used only in remaining 1% of networks.

Network Protocols and Their Functions

Protocols

Whenever a person want to talk with another person then their communicating language should be same so that they can easily communicate with each other .If they will use different languages then they can not understand what the other is saying. Similarly in Computer Networks certain rules are defined so that computers can communicate with one another.These Pre defined rules are called Protocols and can be defined as "Protocols are the predefined rules between the communicating devices that govern the communication between them."

Functions Of Protocols

i)  Sequencing of Data:- Protocols split large size messages to equal size pieces called Packets which can be transmitted easily.each packet contains unique identification number and can be easily arranged at receiver end to create original message.

ii) Flow Control of Data:-This is another important function of protocols.if sender is sending continuously data and receiver is not in a condition to receive that data or having less receiving speed then their are the chances of data loss.This data loss is avoided by the use of Protocols.