Mdc7 digital currency
Publish: 2021-05-28 16:40:16
1.
Digital money is legal
digital currency itself is legal in China. Digital currency is defined as Internet goods in China, but the relevant supervision is still blank, and digital currency is still in the gray area in China. Well known digital currencies include bitcoin, Leyte coin, Ruitai coin, thousand gold card, dog coin, etc
however, there are also some non developers who use the cover of digital currency to carry out pyramid schemes, such as the Vicat scheme, treasure scheme, Porter scheme and so on
development materials:
digital currency is different from the virtual currency in the virtual world, because it can be used for real goods and services transactions, not limited to online games. The early digital currency (digital gold currency) is a form of electronic currency named after the weight of gold. Today's digital currency, such as bitcoin, lightcoin and ppcoin, is an electronic currency created, issued and circulated by check sum cryptography. It is characterized by the use of P2P peer-to-peer network technology to issue, manage and circulate currency. In theory, it avoids bureaucratic examination and approval, so that everyone has the right to issue currency
2.
assets里面找
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1费防吞
3. Do you mean MDC?
4. Recently, I also heard it in the live broadcast room of Gulin conference. Four teachers, Xiao Ya, Tian, Huaqiang and Jiacheng, were all working hard to give lectures. They also gave books free of charge to enhance their trust. They were doing charity in the name of Tencent public welfare: empty nest is not empty, Silver Angel plan, giving lectures free of charge. They were able to help more people. After making money, they consciously donated money. In Huaqiang class, he said, wait a minute, Then open the gold account to close the position, and ask the teacher what you buy to earn so much in class. Hua Qiang doesn't pay attention to continue the lecture. The next day, he asks the teacher what you buy to earn so much, so he introces it to make money by buying gold. Then the teacher will say that the stock market is not good recently, and speculation in gold improves earnings. The partners coax the teacher to make money, The teacher said that it was easier to make money by speculating in gold than by making money in stocks, and the profits could be doubled a year ago. When Tian was lecturing, his friends asked the teacher to bring in speculating in gold. Tian said that he would ask Huaqiang to open an account there, and then introce an account opening specialist to take the lead to test the security of the platform and place an order to try to make profits, so as to prompt the risk. He should listen to the teacher's instructions, and not ride his own bicycle, In fact, there should not be so many 100 places in the test. It is estimated that most of them are partners. They made five orders in three days and said that they won the whole game. The 10% to 20% positions in the operation were all turned over. Everyone was a little envious when they saw that it was difficult to make money in the stock market recently. During the public beta, they were encouraged by the teachers to go to open a special account. The teachers always remind us to clear the position of a shares and then move to the gold market, When the A-share market returns to the A-share market to cheat the investors to clear their positions and transfer their a-account into gold, they want to wait for the dream of making a fortune and join the gold team after a fat year. At the same time, the wechat group of the Gulin meeting will also be dissolved, because those who have not joined will be kicked out. Usually, the helmsman of the group always suggests that they can't add friends to prevent them from being cheated. The purpose is to prevent the investors from contacting unilaterally, Gold speculation will help you make a little money at the beginning, and the money you earn is also in the market. It doesn't matter. Once you make money, you will trust them more, and then invest more money. I estimate that after you place an order, you will have to give them a screenshot to prove whether you have followed the prompts. If you violate the rules, you will also kick out the gold team. Then when the nightmare starts, he will ask you to place an order frequently and close the position if you make a little money, Earn a commission, or even ask you to reverse the order, and then make up the position. Although you feel that something is wrong, but you are afraid of being kicked out of the group, you can only listen to him (because you have made money before), and watch until the last burst of the position, which makes you lose a lot of money. You can join the gold and say that if you hold on for a while, the dawn will come. If you rebound and close the position again, you won't lose a lot of money. At this time, you have no choice but to fight, If you lose all of them, he will ask you to find more money to make a comeback. Maybe you will listen to him. In fact, the money you made nine times can't cover a huge loss. What you lost is what he earned. Will he let you go? In the end, he will say that the trend of international gold is not controlled by anyone, and he also loses a lot. I didn't expect that the market would be like this to get your understanding. It's a pity that I was kicked out of the group today and didn't inform you in time,
5. It's normal to have acne on your face in adolescence, so you don't have to care too much about other people's eyes. As long as you face it calmly, people won't laugh at you. You need to adjust your attitude.
6. It's not difficult for linear algebra to take its time. It requires a lot of calculation and patience. Do not understand the look at examples.
7. Do you want to design or write a thesis? If you want to write a thesis for others, what should you do for your defense! Ah, let me give you a design reference.
Chapter 1 network system
I. project content
the whole network system project involves network engineering and wiring engineering. The whole project includes data and voice. In the design of this scheme, the content of the design includes the following aspects:
★ the location of the main computer room (MDF)< The location of distribution room (IDF) is determined
★ the coverage of each IDF
★ the number of user terminals controlled by IDF
★ calculate the distance between IDF and MDF, and select the appropriate transmission medium
★ design of pipeline routing and selection of network technology
★ selection of network equipment
2 Statistical analysis of the distribution of information points
Department voice date VOD background music
dining area restaurant 202 has
banquet hall 100 has
Office 12020
air conditioning room 111
fire control room 111
kitchen 333
lobby 122 has
private room 14014 has
conference office area large conference room 111
storage room 110
Warehouse 3 3 3
small meeting room 4 04
Office 1 20 20
Business Center 1 55
clinic 1 1 1
Office 2 60 60
ty room 1 1
Cafe 1 1 1 1 1 has
KTV area private room 11 0 11 has
dance hall 2 2 2
shopping center 2 2 2 2 2
bar 1 1 1 1 1 1 1 has
Cafe 1 1 1 1 1 1 1 has
sauna area 1 1 1 1 1
fitness area 1 1 1 1 1 1 1
guest room According to the above statistics, it is not difficult to see that information points are mainly distributed in offices and guest rooms. The information points on the third floor are the most. In order to minimize the cost and facilitate the implementation of the project. In this design, MDF is designed in the storage room near the office on the third floor of the hotel, and 1 to 2 IDF are set on the other floors as the forwarding point of the floor information. The principle of determining IDF is: convenient management, try not to affect the planning of other systems, and the farthest distance to the floor is not more than 100m. The specific location is as follows:
1F 2F 3F 4f 5F 6F
office near guest room storage room storage room storage room
pipe well pipe well pipe well
telephone network fully uses date network, and telephone of each floor is also included in IDF. Its structure diagram is as follows:
Third, network engineering scheme design
the backbone of the network system adopts optical fiber technology, and the network structure adopts star structure, so that the backbone of the network system will directly span Gigabit Ethernet, and the switch will provide 10 / 100M bandwidth to the desktop
3.1 selection of network equipment
this scheme adopts backbone Gigabit Ethernet technology, and the network topology is star structure. The central switch is cascaded with a des-6000 Ethernet switch. Responsible for data exchange and network management of the whole network. Achieve the highest cost performance. The secondary switch adopts D-Link des-3226s and D-Link 1024r +, and is cascaded with the central switch through 62.5/125 multimode indoor optical fiber. The equipment statistics of each floor are as follows:
location, equipment model and quantity
3F_ Storage room - MIS des-1024r + 4
des-3226 1
des-6000 1
1F_ Office - IDF des-3226 1
des-1024r + 3
2F_ Near guest room - IDF des-3226 1
des-1024r + 1
3F_ Storage room - IDF des-3226 1
des-1024r + 3
4F_ Storage room - IDF des-3226 1
des-1024r + 1
4F_ Pipeline well - idf2 des-1024r + 2
5F_ Storage room - IDF des-3226 1
des-1024r + 1
5F_ Pipeline well - idf2 des-1024r + 2
6F_ Storage room - IDF des-3226 1
des-1024r + 1
6F_ Pipeline well - IDF 2 des-1024r + 2
total
des-1024r + 21 sets
des-3226 6 sets
des-3308fg 1 set
the topology is as follows:
3.2 host system selection and characteristics Introction
central switch - des-6000
des-6000 is a chassis type Gigabit Ethernet switch with network management, The 10 / 100 / 1000 Mbps Ethernet switching technology is integrated into the same large capacity chassis equipment. Des-6000 provides 9 expansion slots, one of which is used to install the management mole, and the other 8 slots can be inserted with 10m, 100m, 1000m and other switching moles, which can adapt to various bandwidth and media requirements
10 / 100 / 1000Mbps upgradability
des-6000 adopts molar design, with 8 available slots, and can select high-density 10Base-T, 100base-tx, 100Base-FX moles, And gigabit optical fiber or twisted pair mole, so it is easy to expand and upgrade, improve the flexibility of the application, and protect the user's investment
128 10 / 100Mbps ports
des-6000 can plug in 16 10 / 100Mbps port moles, with a maximum of 128 10 / 100Mbps ports. In full plex mode, it has the function of flow control and supports port trunking. It can be used to establish 100 MB trunk or directly switch 100 MB to desktop
96 100Base-FX optical fiber ports
des-6000 can plug 12 port 100Base-FX MT-RJ optical fiber mole, which can be configured with up to 96 100Base-FX ports. It is very suitable for remote areas such as campus network, smart community, troops and places with high data security requirements< There are four types of Gigabit moles to choose from: 1000base-sx mole with SC interface, 1000base-sx mole with MT-RJ interface, 1000base-lx mole with SC interface (remote optical transmission) and 1000BASE-T mole with RJ-45 interface. Through Gigabit ports, the Department network can be connected with high-speed Gigabit backbone, and high-performance servers can be connected at the same time, so as to eliminate the network bottleneck and better support the large amount of data and multimedia transmission
rendant backup
des-6000 provides hot plug rendant power moles, which can improve the reliability of campus or enterprise applications
comprehensive network management
des-6000 supports Telnet, SNMP and RMON network management<
level-2 switch des-3226
layer-2 switch with network management
> this switch is a rack type switch with network management. Support 24 10 / 100M ports and a fast Ethernet fiber mole and Gigabit mole< The 24 ports support full plex and half plex, and 10m and 100m are adaptive
> ieee802.3x flow control allows users to connect the server with the switch for fast and reliable data transmission. In 200Mbps full plex mode, the switch can provide high-speed data transmission channel for user's server with the lowest data loss rate
> port based VLAN can allow users to control the broadcast domain, divide the network communication data flow, and improve the performance and manageability
> port trunk allows users to combine 8 10 / 100 megabyte ports to form a port trunk, creating a larger full plex aggregate bandwidth. Users can set up up to 4 ports for the switch< The priority queue of ieee802.1p communication data flow allows users to queue according to important data flow and non important data flow to achieve the best network speed. This feature allows users to run applications such as VoIP, video conferencing and multimedia< The built-in HTTP server can provide a simple and web-based switch management interface through a standard web browser< The built-in SNMP and RMON management information base allows users to manage the switch by using D-Link D-View, HP OpenView and other platforms under Windows operating system in the environment of third-party network management equipment< It supports IEEE 802.1d spanning tree protocol and allows users to configure switches on networks with rendant backup paths to maximize network running time
main features
> 24 10 / 100M ports
> 1 GBIC Gigabit or 100m multimode fiber slot
> all ports support full plex mode
> automatic learning of network configuration
> full plex mode flow control to protect data from loss
> port based VLAN, Improve performance and security
> multi port trunk road aggregation bandwidth
> spanning tree protocol supports path rendancy backup
> SNMP management and RMON monitoring can be compatible with third-party management platform
> Web based management, The device can be managed by web browser at any position of the network line
> TFTP firmware upgrade
technical parameters
> 1 DB-9 RS-232 control port
> telnet in-band, out-of-band configuration
> switching mode; Store / forward the MAC address list; Each device 8K
> RMON group: 1, 2, 3, 9
> IP address automatic identification; Through the DHCP client, BOOTP client
> front panel fault diagnosis led indicator
> rendant power connection socket
> standard 19 inch rack installation
> EMI; FCC CE class A, c-tick, VCCI class A, BSMI class a
safety: UL / cul, TUV / GS
IV. generic cabling system design
4.1 project introction
the project includes office area, staff dormitory building and power distribution room, which is divided into two parts: data and voice. The brief introction is as follows:
} the network center computer room is located in 3F, and the network main equipment will be concentrated here. As the main network forwarding place
★ to facilitate connection and maintenance, cabinets are placed in places where networks and telephone points are relatively concentrated for centralized network switches, hubs and telephone line equipment
★ cat.5e UTP is used to connect all information points in the horizontal wiring part of each IDF. 2p telephone line is used for wiring to voice points. The possible digital telephone is considered in the scheme
★ in order to facilitate the wiring between the floors, it is necessary to set up a large enough bridge
★ if the line runs on the ceiling, then when the line reaches the approximate position, it will be led from the ceiling to the designated point by using the trunking. If it needs to pass through the floor, it will use the special arc-shaped strip for the ground. Some sockets need to be laid on the ground and special sockets are needed
★ the wiring in the working area shall be dark<
4.2 design of MIS and IDF machine rooms
the construction building has 6 floors in total, so the 3F with centralized information points is selected for the MIS machine room. The determination principle and specific location have been introced before, and will not be repeated here. According to the drawing analysis, the area of MIS room is 1.5 square meters × 6 square meters, if it can be widened. If the 2F sub machine room can not find a suitable location, the wall mounted cabinet can be placed in the pipeline well, but this will increase the difficulty of construction. For others, there are two IDF rooms on the 4th, 5th and 6th floors to avoid the UTP transmission distance exceeding 100m. There is also the problem of cabinet space
4.3 trunk design
source destination number distance (m) type
3F_ Storeroom - MDF 1F_ Office - IDF 1 55 multimode 6C
3F_ Storage room - MDF 2F_ Near guest room - IDF 150 multimode 6C
3F_ Storage room - MDF 3F_ Storeroom - IDF 190 multimode 6C
3F_ Storage room - MDF 4F_ Storeroom - IDF 150 multimode 6C
4F_ Storeroom - IDF 4F_ Pipeline well - IDF 24 90 CAT5e UTP
3F_ Storage room - MDF 5F_ Storeroom - IDF 1 55 multimode 6C
5F_ Storeroom - IDF 5F_ Pipeline well - IDF 24 90 CAT5e UTP
3F_ Storage room - MDF 6F_ Storage room - IDF 160 multimode 6C
6F_ Storeroom - IDF 6F_ Pipeline well - IDF 24 90 CAT5e UTP
3F_ Storeroom - MDF 1F_ Office - IDF 1 55 100p large pair cable
3F_ Storage room -
Chapter 1 network system
I. project content
the whole network system project involves network engineering and wiring engineering. The whole project includes data and voice. In the design of this scheme, the content of the design includes the following aspects:
★ the location of the main computer room (MDF)< The location of distribution room (IDF) is determined
★ the coverage of each IDF
★ the number of user terminals controlled by IDF
★ calculate the distance between IDF and MDF, and select the appropriate transmission medium
★ design of pipeline routing and selection of network technology
★ selection of network equipment
2 Statistical analysis of the distribution of information points
Department voice date VOD background music
dining area restaurant 202 has
banquet hall 100 has
Office 12020
air conditioning room 111
fire control room 111
kitchen 333
lobby 122 has
private room 14014 has
conference office area large conference room 111
storage room 110
Warehouse 3 3 3
small meeting room 4 04
Office 1 20 20
Business Center 1 55
clinic 1 1 1
Office 2 60 60
ty room 1 1
Cafe 1 1 1 1 1 has
KTV area private room 11 0 11 has
dance hall 2 2 2
shopping center 2 2 2 2 2
bar 1 1 1 1 1 1 1 has
Cafe 1 1 1 1 1 1 1 has
sauna area 1 1 1 1 1
fitness area 1 1 1 1 1 1 1
guest room According to the above statistics, it is not difficult to see that information points are mainly distributed in offices and guest rooms. The information points on the third floor are the most. In order to minimize the cost and facilitate the implementation of the project. In this design, MDF is designed in the storage room near the office on the third floor of the hotel, and 1 to 2 IDF are set on the other floors as the forwarding point of the floor information. The principle of determining IDF is: convenient management, try not to affect the planning of other systems, and the farthest distance to the floor is not more than 100m. The specific location is as follows:
1F 2F 3F 4f 5F 6F
office near guest room storage room storage room storage room
pipe well pipe well pipe well
telephone network fully uses date network, and telephone of each floor is also included in IDF. Its structure diagram is as follows:
Third, network engineering scheme design
the backbone of the network system adopts optical fiber technology, and the network structure adopts star structure, so that the backbone of the network system will directly span Gigabit Ethernet, and the switch will provide 10 / 100M bandwidth to the desktop
3.1 selection of network equipment
this scheme adopts backbone Gigabit Ethernet technology, and the network topology is star structure. The central switch is cascaded with a des-6000 Ethernet switch. Responsible for data exchange and network management of the whole network. Achieve the highest cost performance. The secondary switch adopts D-Link des-3226s and D-Link 1024r +, and is cascaded with the central switch through 62.5/125 multimode indoor optical fiber. The equipment statistics of each floor are as follows:
location, equipment model and quantity
3F_ Storage room - MIS des-1024r + 4
des-3226 1
des-6000 1
1F_ Office - IDF des-3226 1
des-1024r + 3
2F_ Near guest room - IDF des-3226 1
des-1024r + 1
3F_ Storage room - IDF des-3226 1
des-1024r + 3
4F_ Storage room - IDF des-3226 1
des-1024r + 1
4F_ Pipeline well - idf2 des-1024r + 2
5F_ Storage room - IDF des-3226 1
des-1024r + 1
5F_ Pipeline well - idf2 des-1024r + 2
6F_ Storage room - IDF des-3226 1
des-1024r + 1
6F_ Pipeline well - IDF 2 des-1024r + 2
total
des-1024r + 21 sets
des-3226 6 sets
des-3308fg 1 set
the topology is as follows:
3.2 host system selection and characteristics Introction
central switch - des-6000
des-6000 is a chassis type Gigabit Ethernet switch with network management, The 10 / 100 / 1000 Mbps Ethernet switching technology is integrated into the same large capacity chassis equipment. Des-6000 provides 9 expansion slots, one of which is used to install the management mole, and the other 8 slots can be inserted with 10m, 100m, 1000m and other switching moles, which can adapt to various bandwidth and media requirements
10 / 100 / 1000Mbps upgradability
des-6000 adopts molar design, with 8 available slots, and can select high-density 10Base-T, 100base-tx, 100Base-FX moles, And gigabit optical fiber or twisted pair mole, so it is easy to expand and upgrade, improve the flexibility of the application, and protect the user's investment
128 10 / 100Mbps ports
des-6000 can plug in 16 10 / 100Mbps port moles, with a maximum of 128 10 / 100Mbps ports. In full plex mode, it has the function of flow control and supports port trunking. It can be used to establish 100 MB trunk or directly switch 100 MB to desktop
96 100Base-FX optical fiber ports
des-6000 can plug 12 port 100Base-FX MT-RJ optical fiber mole, which can be configured with up to 96 100Base-FX ports. It is very suitable for remote areas such as campus network, smart community, troops and places with high data security requirements< There are four types of Gigabit moles to choose from: 1000base-sx mole with SC interface, 1000base-sx mole with MT-RJ interface, 1000base-lx mole with SC interface (remote optical transmission) and 1000BASE-T mole with RJ-45 interface. Through Gigabit ports, the Department network can be connected with high-speed Gigabit backbone, and high-performance servers can be connected at the same time, so as to eliminate the network bottleneck and better support the large amount of data and multimedia transmission
rendant backup
des-6000 provides hot plug rendant power moles, which can improve the reliability of campus or enterprise applications
comprehensive network management
des-6000 supports Telnet, SNMP and RMON network management<
level-2 switch des-3226
layer-2 switch with network management
> this switch is a rack type switch with network management. Support 24 10 / 100M ports and a fast Ethernet fiber mole and Gigabit mole< The 24 ports support full plex and half plex, and 10m and 100m are adaptive
> ieee802.3x flow control allows users to connect the server with the switch for fast and reliable data transmission. In 200Mbps full plex mode, the switch can provide high-speed data transmission channel for user's server with the lowest data loss rate
> port based VLAN can allow users to control the broadcast domain, divide the network communication data flow, and improve the performance and manageability
> port trunk allows users to combine 8 10 / 100 megabyte ports to form a port trunk, creating a larger full plex aggregate bandwidth. Users can set up up to 4 ports for the switch< The priority queue of ieee802.1p communication data flow allows users to queue according to important data flow and non important data flow to achieve the best network speed. This feature allows users to run applications such as VoIP, video conferencing and multimedia< The built-in HTTP server can provide a simple and web-based switch management interface through a standard web browser< The built-in SNMP and RMON management information base allows users to manage the switch by using D-Link D-View, HP OpenView and other platforms under Windows operating system in the environment of third-party network management equipment< It supports IEEE 802.1d spanning tree protocol and allows users to configure switches on networks with rendant backup paths to maximize network running time
main features
> 24 10 / 100M ports
> 1 GBIC Gigabit or 100m multimode fiber slot
> all ports support full plex mode
> automatic learning of network configuration
> full plex mode flow control to protect data from loss
> port based VLAN, Improve performance and security
> multi port trunk road aggregation bandwidth
> spanning tree protocol supports path rendancy backup
> SNMP management and RMON monitoring can be compatible with third-party management platform
> Web based management, The device can be managed by web browser at any position of the network line
> TFTP firmware upgrade
technical parameters
> 1 DB-9 RS-232 control port
> telnet in-band, out-of-band configuration
> switching mode; Store / forward the MAC address list; Each device 8K
> RMON group: 1, 2, 3, 9
> IP address automatic identification; Through the DHCP client, BOOTP client
> front panel fault diagnosis led indicator
> rendant power connection socket
> standard 19 inch rack installation
> EMI; FCC CE class A, c-tick, VCCI class A, BSMI class a
safety: UL / cul, TUV / GS
IV. generic cabling system design
4.1 project introction
the project includes office area, staff dormitory building and power distribution room, which is divided into two parts: data and voice. The brief introction is as follows:
} the network center computer room is located in 3F, and the network main equipment will be concentrated here. As the main network forwarding place
★ to facilitate connection and maintenance, cabinets are placed in places where networks and telephone points are relatively concentrated for centralized network switches, hubs and telephone line equipment
★ cat.5e UTP is used to connect all information points in the horizontal wiring part of each IDF. 2p telephone line is used for wiring to voice points. The possible digital telephone is considered in the scheme
★ in order to facilitate the wiring between the floors, it is necessary to set up a large enough bridge
★ if the line runs on the ceiling, then when the line reaches the approximate position, it will be led from the ceiling to the designated point by using the trunking. If it needs to pass through the floor, it will use the special arc-shaped strip for the ground. Some sockets need to be laid on the ground and special sockets are needed
★ the wiring in the working area shall be dark<
4.2 design of MIS and IDF machine rooms
the construction building has 6 floors in total, so the 3F with centralized information points is selected for the MIS machine room. The determination principle and specific location have been introced before, and will not be repeated here. According to the drawing analysis, the area of MIS room is 1.5 square meters × 6 square meters, if it can be widened. If the 2F sub machine room can not find a suitable location, the wall mounted cabinet can be placed in the pipeline well, but this will increase the difficulty of construction. For others, there are two IDF rooms on the 4th, 5th and 6th floors to avoid the UTP transmission distance exceeding 100m. There is also the problem of cabinet space
4.3 trunk design
source destination number distance (m) type
3F_ Storeroom - MDF 1F_ Office - IDF 1 55 multimode 6C
3F_ Storage room - MDF 2F_ Near guest room - IDF 150 multimode 6C
3F_ Storage room - MDF 3F_ Storeroom - IDF 190 multimode 6C
3F_ Storage room - MDF 4F_ Storeroom - IDF 150 multimode 6C
4F_ Storeroom - IDF 4F_ Pipeline well - IDF 24 90 CAT5e UTP
3F_ Storage room - MDF 5F_ Storeroom - IDF 1 55 multimode 6C
5F_ Storeroom - IDF 5F_ Pipeline well - IDF 24 90 CAT5e UTP
3F_ Storage room - MDF 6F_ Storage room - IDF 160 multimode 6C
6F_ Storeroom - IDF 6F_ Pipeline well - IDF 24 90 CAT5e UTP
3F_ Storeroom - MDF 1F_ Office - IDF 1 55 100p large pair cable
3F_ Storage room -
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