[Former]openstack-networking-neutron (i)---end-to-end and point-to-point understanding

The purpose of this article =====

Understand the two concepts to clarify:

1. End-to-end 2. To point 3. Ethernet Devices

Theory = = = = =

The reliability of data transmission is ensured by the end-to-end of the point-to-point and the transport layer of the link layer and the network layer. Point-to-point is based on MAC address or IP address, refers to one device to send data to another device,
These devices refer to direct-attached devices including network cards, routers, and switches. An end-to-end is a network connection, a remote communication between applications. End-to-end does not need to know how the underlying is transmitted, is a logical link.

End-to-end: End-to-end vs. Point is for the relationship between the two devices that are transmitted across the network. End-to-end transmission refers to a variety of switching devices before data transfer,

At both ends of the device asked to establish a link, they are directly connected to the same, the link is established, the sending side can send data, until the data is sent, the receiving end

Confirm Receipt Success (<---can be likened to the phone, the status after the telephone is connected). The advantage of end-to-end transmission is that after the link is established, the transmitting side knows that the receiving device will

Received, and the intermediate switching device does not need to store and forward, so the transmission delay is small (<--calls when the instant call does not require storage and forwarding). End

The disadvantage of the to-end transmission is that until the receiver receives the data, the transmitting side of the device has to participate in the transmission (no one can hang up after the phone is connected, or cannot communicate).

If the delay of the entire transmission is very long, then it is very wasteful to the transmitting device (after the call, if one side talks, the other party will have a long time to hear

This is the case). Another disadvantage of end-to-end transmission is that if the receiving device shuts down or fails, then the end-to-end transmission is not possible (the other side has shut down, certainly

You can't transfer your voice.

To point-to-point system refers to the sending end of the data to the device directly connected to it (people will mail in the mail box by the postman responsible for transmitting letters, people standing in the mailbox, similar to the mailbox connected),

At the right time, the device transmits the data to the next device directly connected to it (a letter from one post office to another post office), through a directly connected device (the mail truck

Through a lot of post offices), the data is transmitted to the receiving end (the letter eventually arrives at the recipient's hands). The advantage of point-to-point transmission is that the sending device sends out the data and its tasks are completed without

To participate in the entire transfer process, so that does not waste the resources of the sending device (people put the letter into the mailbox, you can do other things). In addition, even if the receiving end device shuts down or fails,

Point-to-point transmissions can also be buffered with storage-and-forwarding technology (no recipients are temporarily found, and letters are saved at the local post office). The disadvantage of point-to-point transmission is that after the sender sends the data,

I do not know whether the receiving side can receive or when the data will be received (if the recipient does not inform the sender has received the letter, the addressee is not known, unless a phone call or send a letter to the sender, hehe).

Ethernet Devices: network cards, routers, bridges, etc

Reference:

Https://en.wikipedia.org/wiki/Peer-to-peer

Http://jingyan.baidu.com/article/19192ad812650de53e570781.html

Http://zhidao.baidu.com/link?url=UDtv6IhZpCt-GA6u0NdkCnQcifyo8FKW6R-SJb9YWt4eObgyloOoLMHUvok8F4-b_-2hcxnYaRtm27XfXIJ0yq

[Original]openstack-networking-neutron (i)---end-to-end and point-to-point understanding