The mysterious Ethereum
each version of Ethernet has a maximum cable length limit (that is, the length without amplification). Signals within this range can propagate normally, and signals beyond this range cannot propagate
in order to allow the construction of a larger network, repeaters can be used to connect multiple cables. Repeater is a physical layer device, which can receive, amplify and retransmit signals in two directions
extended data
several common Ethernet interface types
1. SC optical fiber interface
SC optical fiber interface has been applied in the era of 100base TX Ethernet, so it was called 100base FX at that time (F is the abbreviation of optical fiber). However, at that time, because the performance was not more prominent than twisted pair, but the cost was higher, so it was not popularized. Now the instry vigorously promotes gigabit network, and SC optical fiber interface is re valued
2. RJ-45 interface
this kind of interface is the most common network equipment interface, commonly known as "crystal head", and the professional term is RJ-45 connector, which belongs to the type of twisted pair Ethernet interface. RJ-45 plug can only be inserted along the fixed direction, and a plastic spring piece is set to be stuck with RJ-45 slot to prevent it from falling off
3. FDDI interface
FDDI has the highest transmission rate among the mature LAN technologies. It has the characteristics of timed token protocol, supports a variety of topologies, and its transmission medium is optical fiber. Fiber distributed data interface (FDDI) is a set of protocols developed by American National Organization for Standardization (ANSI) to transmit digital signals on optical cables
reference source: Network Ethernet interface
After reading the answers of other respondents, I really want to laugh. It's not terrible to pretend that I don't understand. What's terrible is to answer blindly. There's something wrong with this question. The burst of 5.7 billion yuan has nothing to do with a drop of 10 cents. It can even be said that its disappearance is e to the sharp rise. So where is the decline? If bitcoin really falls, it will not be 5.7 billion capital washed away, it will be tens of billions, hundreds of billions of capital evaporated, those who talk about trends and development, please study the capital and stock market well, and by the way, please search for the meaning of the word "burst", no culture is too terrible
in addition, I would like to make a digression. Recently, a hot topic is fund. In 2021, the annual meeting is more or less a national fund. In 2020, the fund manager is still a good active fund. Even if the position is not changed, the annual yield will reach at least 40%, but this does not mean that this year is still OK, It's not that everyone can make money playing with funds. it's similar to the nature of stocks. Index funds, stock funds and even active funds are risky. I think many people say that they should get on the bus quickly. They are really worried about your funds of course, 2021 may be a bull market. It is estimated that the whole network has spread, many people are rubbing their hands to make a lot of money, but I can't do much. I just advise you not to go with the flow too much, don't be greedy, and don't think you are. That's all. Good luck
linux下如何看网卡是千兆还是百兆的方法如下：
使用ethtool命令
ethtool是Linux下用于查询及设置网卡参数的命令
举例：
[root@hvrhub ~]# ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s ------------------------------------>网卡速度
Duplex: Full
Port: MII
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
Link detected: yes
详细参数参考：//后面是注释，是原文的译文
ethtool ethX /
ethtool –h //显示ethtool的命令帮助(help)
ethtool –i ethX //查询ethX网口的相关信息
ethtool –d ethX //查询ethX网口注册性信息
ethtool –r ethX //重置ethX网口到自适应模式
ethtool –S ethX //查询ethX网口收发包统计
ethtool –s ethX [speed 10|100|1000] //设置网口速率10/100/1000M
[plex half|full] //设置网口半/全双工
[autoneg on|off] //设置网口是否自协商
[port tp|aui|bnc|mii] //设置网口类型
if it's 32-bit or 64 bit, now the game console has gone far beyond... Now it's called next generation
Yunyan District, as the main part of the old city of Guiyang, is in charge of the busiest and most prosperous business district in Guiyang. The region is rich in eco-tourism cultural resources, beautiful scenery, beautiful mountains and rivers, many places of interest, no severe cold in winter and no intense heat in summer. It is an ideal tourist and summer resort
Introction to Guiyang City: Guiyang, the capital of Guizhou Province, is known as "forest city" for its short name of Zhu and Jinzhu. It is the political, economic, cultural, science and ecation, transportation center of Guizhou Province and an important transportation, communication hub, instrial base and business and tourism service center in Southwest China
one of the central cities in Southwest China, the national ecological leisure tourism city and the national comprehensive railway hub. Located in the middle of Guizhou Province, it borders Weng'an, Longli, Huishui and Changshun counties of Qiannan Buyi and Miao Autonomous Prefecture in the southeast, Pingba County of Anshun Prefecture and Zhijin County of Bijie Prefecture in the west, Qianxi and Jinsha counties of Bijie Prefecture and Bozhou District of Zunyi City in the north
Guiyang is located in the middle of the original hills in the middle of Guizhou Province, with high terrain in the southwest and low terrain in the northeast, with an altitude of about 1100 meters. It belongs to subtropical humid and mild climate, with an annual average temperature of 15.3 ℃ and an annual average relative humidity of 77%. In 2016, the forest coverage rate was 46.5%, and there were 11 forest parks