What is the Internet model?

When I studied computer network, I found that what the book says is completely different from reality. I was puzzled for a long time before I discovered that the original hub, the csmacd protocol, which are all old antique technology, are basically not used now. So I want to know those technologies in the book such as: ppp protocol, arp protocol, hdlc protocol, and various theories such as frequency division multiplexing, time division multiplexing, half-duplex, full-duplex, etc. It's still very common until now).

Many students who are beginning to learn computer networks will have this problem. Why is the knowledge in the real world decoupled from books? Students who have passed the CCIE may not be able to clearly explain the common technologies (PPPoE, L2TP, GPON) in the home network. This is actually not everyone's fault, but because the computer network industry is developing too fast.

Who would have thought that mobile Internet surfing became the mainstream trend? Desktop computers are mostly used at work. The servers that once served the Internet are no longer physical servers, but now they are lying on virtual servers in large data centers. What used to be a copper telephone line is now a glass fiber. The once 10M Ethernet is now a 1000M or even a 10000M high-speed switch. In cloud data centers, these switches are even invisible software switches. The current textbooks used in colleges and universities are ancient textbooks from 20 to 30 years ago, exuding an outdated atmosphere.

In the security field, the RSA public key algorithm, which has been in the works for more than 40 years, will gradually be replaced by the ECC public key algorithm. Mainly to meet the needs of mobile computing intelligent terminals, limited computing power (CPU), but also to ensure high security, low latency, a natural replacement. The 256-bit ECC algorithm can be equivalent to the security provided by the 2048-bit RSA algorithm. Who would use a RSA public key algorithm on a mobile terminal? Maybe in a few years, the ECC algorithm will be replaced by a faster and more secure algorithm, but what does this matter? Just keep an open mind, embrace new technology, and make technology work for me

. Internet model

There is no Internet in the world. There are more people who use the Internet. The Internet is mainly for human beings. The Internet is wherever people are. In the age of computer dial-up, the leaves of the Internet reached your home. Now that mobile phones use 4G to access the Internet, the leaves of the Internet are reaching into your hands. Users move their fingers a few times and may place an order to buy goods within seconds. Think about the 8 billion people on the planet, which holds infinite business opportunities. However, if it takes tens of seconds for a web page to open, when the user sees the product, the user ’s sore back has a sore back, and the user ’s desire to shop will plummet. This is not a personal opinion, but a statistics from big data. result.

Prophets realize this. The web is the core element that determines how long it takes a user to open a webpage in a few seconds, seconds, or tens of seconds. So soon there was the birth of a 100M 4G mobile network. This technology not only promoted the rapid development of the global Internet, but also the engine of the rapid development of e-commerce. In order to open the web page in the shortest time, various departments have optimized this process from different levels. The server is placed in the data center closest to the user, and the intelligent DNS domain name is resolved to avoid users connecting to the server across the network. The intelligent terminal uses a high-speed and secure encryption algorithm. TLS 1.30 RTT is all to reduce the delay and meet the user's extremely fast speed Online shopping experience.

The only constant in this world is change itself, and so is technology. We don't need to chase behind new technology, it's too passive and too tired. Instead, ask yourself why there are these new technologies. Once the fog is shrouded in the new technology, the same sound will be made, but that is the case!

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