Is it a message or a science, and what majors can you choose for a message report??? The more detail

Historical experience proves that:

The liberal arts have a limited and single outlet.

The scope of employment is relatively narrow.

There are many career paths in science and a wide range of employment.

It is more conducive to the development ...... in the future

There are many employers.

Many of my friends and teachers are all academics.

They are quick to think and know how to make good use of others.

After entering the society, they have good attainments.

It turns out: interest is the best teacher!

You also said that you like mathematics, physics and chemistry.

Although it feels strenuous.

But interest is motivation.

It's the teacher! Men tend to think logically.

So would like to study things that have technical content.

Maybe you don't feel right now.

Over time, you will definitely enjoy it more and more.

Because it's fun and challenging.

The reason why you feel struggling.

It may be that you haven't used your full strength yet.

Or maybe you haven't found a learning method that suits you for a while!

There is money in science.

No matter which subject, in fact, if you study hard, you will have money.

Suddenly you found out that you chose the classification of couples.

Boys should have a lot of ways out after studying science, but it's not necessarily, anyway, when you get to high school, you will find that many courses will change, and if you are not sure about physics, please choose liberal arts.

It's okay to be a secretary or something!!

Choose science, any facts prove that science will be more popular in the future, and you don't reject it.

A packet is a unit of exchange and transmission in the network, that is, a block of data that a site sends at one time.

1. The packet contains the complete data information to be sent, and its length is very inconsistent, and the length is unlimited and variable.

2. Packet authentication methods include traditional encryption mode, packet authentication code mode using key, authentication mode using one-way hash function, and digital signature authentication mode.

3. When a site wants to send a packet, it attaches a destination address to the packet, and the network node sends the packet to the next node according to the destination address information on the packet, and then forwards the packet to the destination node node one by one.

4. After receiving the entire packet and checking that it is correct, each node will temporarily store the packet, then use the routing information to find out the address of the next node, and then transmit the entire packet to the next node.

Advantages and disadvantages of the packet parsing system:

Advantages: 1. High circuit utilization. Since many packets can share the channel between two nodes in time, the transmission capacity of the circuit is required to be low for the same amount of communication.

2. On the circuit-switched network, when the traffic becomes large, it cannot accept new calls. On the key-based switching network, packets can still be received when the traffic is large, but the transmission delay will increase.

3. The message switching system can send a message to multiple destinations, but it is difficult for the circuit switching network to do this.

Disadvantages: 1. It cannot meet the requirements of real-time or interactive communication, and the delay time of the message through the network is long and uncertain.

2. Sometimes when the node receives too much data and has no space to store or cannot be timely, it has to discard the packets, and the sent packets do not arrive at the destination in order.

Choose which one you are good at, why bother yourself so much.