TCP/IP snmp

TCP/IP what it is and why it is needed?
1. We need a way to communicate between our pcs or otherwise called hosts.
2. The communication needs to be reliable and secured.
How it is achieved.
We have something called OSI or 7 layer interface. Why 7 layers?
For simplicity it has been broken down as follows.
7. Physical layer-> This is where the network card of the pc handles the data to be communicated.
6. Network layer(IP)-> The data is communicated from the network card into stream packets to the transport layer.
5. Transport layer(TCP)->Communicates the stream with the application. TCP can handle a stream from the application whereas UDP can only handle chunks of data called the messages.
4,3,2,1: Application layer-> Application generates the data, creates sockets and put information into envelopes. TCP adds its own envelope(header) and ip adds its own envelope. These envelopes are added to deliver the data sequentially n the correct order.

What is SNMP?
Simple netwrok Management Protocol. This a application layer included with the TCP/IP suite. it operates in 3 layers
1.NMS or your computer which you use to manage the network devices.
2. Managed devices which contains an snmp agent which collect all the information. It is also called the MIB.
3. Agent translates the information into snmp compatible type.