Network knowledge: What is the connection between internal network, external network, broadband, bandwidth, traffic and network speed?

I believe many people don’t know the differences and connections between internal network, external network, broadband, bandwidth, traffic, and network speed. Today I will introduce it to you, hoping it will be helpful to everyone!

1. What is the difference between bandwidth and broadband?

Bandwidth 量词refers to, 网速的大小for example, 1Mbps means 一兆比特每秒, this value refers to 带宽.

Broadband 名词means 网络的传输速率很高 。broadband 标准各不相同，最初认为128kbps以上带宽的就是宽带, and the following is bandwidth.

But now domestic operators generally provide one 至少512kbps带宽的宽带服务。, that is to say , one that meets a certain bandwidth value.带宽具体数值宽带传输标准(服务)。

That is: broadband is a business, bandwidth is the transmission speed.

• Broadband: In digital communications, it usually refers to 64kbit/sthe bandwidth of the above signal.

• Bandwidth: In digital communications, it usually refers to 64kbit/sthe bandwidth of the following signals.

1. Broadband

Usually people will ask whether your home can access the Internet? In fact, this means 你家有没有宽带，in other words, it is a noun . 先有了宽带一词，然后才可以说你带宽是多少，Broadband has no direct relationship with the speed of Internet access.

2. Bandwidth  

When we want to apply for broadband, we need to register with some service providers. At this time, depending on the service provider 套餐, you may have to 10Mb/s 、 20Mb/swait. You can calculate your own bandwidth by calculating the byte conversion ratio.

for example:

1B=8b //1字节=8位1KB=1024B1MB=1024KB1GB=1024MB

The bandwidth we apply for is that 10Mb/sthe b in this unit is lowercase, and we just said 1B (byte) = 8b (bit), which is exactly 8 times the relationship, that is, the download speed:10Mb / 8 = 1.25MB

Some people may ask, why do we need to divide by 8?

In computers, units 下载速度是are expressed in terms of what is said is expressed in terms of units.字节(B)提供商比特(b)

For example: when you download a software on the Internet, it will B(字节)be considered as a unit. Another example is that if you open a web page, the web page may contain pictures, text, videos and other contents. In essence, these contents are also downloaded to your computer, and then Only you can see it.

We can use bandwidth to calculate our download speed:

Calculation:带宽大小 / 8

bandwidth	download speed	official
Bandwidth is 2Mb	Download speed is 256KB/s	2 / 8 = 0.25
Bandwidth is 4Mb	Download speed is 512KB/s	4 / 8 = 0.5
Bandwidth is 8Mb	Download speed is 1.00MB/s	8 / 8= 1.0
Bandwidth is 10Mb	Download speed is 1.25MB/s	10 / 8 = 1.25
Bandwidth is 20Mb	Download speed is 2.50MB/s	20 / 8 = 2.50
Bandwidth is 100Mb	Download speed is 12.5MB/s	100 / 8 = 12.50

Sometimes, when using some software to test the network speed, we find that there is a slight gap with the results we calculated. This is a normal phenomenon and is 物理线路磨损caused by some objective reasons.

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Sometimes, when you download software late at night, you will find that the download speed exceeds the theoretically calculated value. This situation also exists.

We can understand it this way: For example, if your home is in area J, then the total line pulled by the provider to area J is 100Mb/s, and your home is applying for 10M. Since the restrictions are set from the router, this is different from setting up the router. Setting related.

The second situation is that the server where you download the software is relatively idle, so the speed is relatively fast.

The third situation is that when we download software, we may use software such as Thunder. Since more people download this software, its speed is also relatively fast.

In layman’s terms:

Bandwidth is like yours 水龙头大小, Internet speed is like从水龙头里出来的水流速有多快。

The above are all about download speed, so 上传速度是怎么计算的呢，其实上传速度这个与地域的不同而不同，一般上传速度都被提供商限制了，this is not accurate.

3. Traffic

The flow rate 对外发送数据与接收数据包的大小总和，is taken in units 1024进制, and the units have B,KB,MB(M),GB(G)

1G=1024MB1M=1024KB1KB=1024字节(B）

Generally, with the data plans we 5元30MB,10元70MBhave on , when we open a webpage, how much data is required? (2005)

Suppose there is on a certain web page  100个汉字与一张100KB的图片,一个汉字=2个字节

That is, the data size of this page is:100 * 2B / 1024 + 100KB = 0.2KB +100KB =100.2KB；

Every time you visit this page, 100.2KBthe amount of traffic will be generated. If 70MBthe traffic is high, then visiting a few web pages will basically be gone, let alone watching videos.

2. The relationship between bandwidth, network speed and traffic

Normally: we say

​​​​​​​

我家的带宽10M现在网速网速：200KB/s看一张图片使用了8M的流量

So what is the relationship between bandwidth, network speed, and traffic, and what do they represent?

1. The unit of bandwidth is:比特/秒（bps）：10M=10Mbps

2. The network speed is 数据传输的速度, the unit is:字节/秒 (B/s， KB/s， MB/s)

​​​​​​​

1MB/s=1024KB/s1KB/s=1024B/s

3. The traffic is the user’s Internet access  发送和接收 ,  数据量总和 and the unit is: 字节（Byte）;

Bit is the smallest unit of information: 1字节=8比特 that is, 1B=8bit or 1B=8b

1字节/秒=8比特/秒 (1B/s=8bps)

1比特 (1b or 1位) Is the smallest storage unit in information technology, 1位代表一个“1”或者“0”;

1B (1 byte) is a relatively small storage unit: generally, one English letter occupies 1 byte; one Chinese character occupies 2 bytes;

4. Conversion between them: bandwidth size / 8

10M带宽(10Mb/s)=1.25MB/s网速1M带宽(1Mb/s)=0.125MB/s=128KB/s10Mbps = 10*1024Kbps =10*1024*1024bps =10*1024*1024/8 Byte/s =10/8 MB/s =1.25 MB/s

    

3. What do uplink bandwidth and downlink bandwidth mean? What is the role of each?

What do upstream bandwidth and downstream bandwidth, or upstream speed and downstream speed, mean?

When setting the speed limit of the router or configuring some other software, you will encounter the configuration of uplink speed and downlink speed. Many users simply do not know what these two means. The following will explain these two in detail:

There are two behaviors when accessing the Internet: 一是上传数据，二是下载数据。upstream broadband (speed) refers to 上传的速度, and downstream broadband (speed) refers to下载数据时的数度。

In more detail, it can be understood as

Uplink bandwidth is the uplink rate

Generally 指从你的电脑上传的速度, the speed at which others communicate with your computer. For example, when you upload your photos to QQ space, the speed of uploading photos at this time is the uplink speed. Others, such as when you upload files to some cloud disks, the speed at this time is also the uplink speed. We may find that, usually Under this circumstance, the speed of uploading files is much slower than the network speed we usually use.

Downlink bandwidth is the downlink rate

Generally, it is 你从网络上的主机下载的速度，the speed at which you download files or open web pages. This speed is the downlink rate. 下行速率通常就是我们平常所说的网速，For example, your bandwidth is 8M for telecommunications, 20M for optical fiber, etc. This speed actually refers to the downlink rate of the network.

Uplink broadband (speed) and downlink broadband (speed) are不对称的。

Generally, what 下行速度大于上行的速度。we usually use 宽带说多少Mrefers to下行宽带，因为我们上网主要是从互联网上下载数据，而上传的数据量要少很多。

Why in the process of using broadband, I found that the download speed of my computer simply cannot meet the standard of the broadband I applied for. For example, for a 10Mb/s broadband, the download speed is only about 1MB/s. Why is this?

Because the bandwidth downlink speed of broadband operators is in different units than the downlink speed on Windows computers . The unit of Windows computers is KBbs/s,and the unit of broadband operators is Kbbs/s, 1B = 8b (1 byte = 8 bits).

Suppose you have a 10M broadband, 10Mbps=10240Kbps/8=1280KBpsso the maximum download speed on your computer 1280KBpsis only about 1.25MB/s. So stop saying that broadband companies are cheating people and deducting the amount of broadband they handle. This is just caused by the different units of calculation.

下载速率In addition to broadband bandwidth, broadband is related to computer configuration , download software used, download size, download website speed, etc. Broadband download speed can be viewed by general download software (such as Thunder).

Under ideal conditions: the downlink broadband of 100M optical fiber broadband is between 10M/S-11M/s; the uplink broadband refers to the speed uploaded to the Internet;; 这个要开你开通的宽带是上下行等同还是不等同了if you don’t know, you can consult your operator; if it is the same, your uplink broadband is also 10M/S - Between 11M/s; it is not the same as the general uplink broadband is only 400kbs/s-500Kbs/s.