Where to look at blockchain distributed ledger

1. That's a good question. Let me give you an example. For example, when I deposit 100 yuan in the bank, the data of this deposit is only recorded in the bank's database, which can't be obtained by others, namely "central bookkeeping". The blockchain is a distributed accounting, a new information recording technology, and it is "encrypted" and "distributed". The data does not exist in a center, but is stored once on the computer of the whole network. For example, if I transfer 100 yuan to you, I will shout to all the computers in the whole network. Let's record the accounts together, that is, "Distributed Accounting".

2. For the benefits, jinwowo feels that the biggest benefit is to obtain great security. First of all, there is a central ledger, so it cannot be destroyed. As like as two peas, each node is only part of the system, and each node has the same rights. Destroying some nodes has no effect on the system at all. Secondly, you can't cheat, because unless you can control most people's computers in the system to make changes, the system will refer to the opinions of most people to decide what is the real result. As a result, it will find that it is totally meaningless to modify your own account book (because others don't admit it). Secondly, since there is no centralized intermediary, making everything run automatically through preset proceres can not only greatly rece costs, but also improve efficiency. Since everyone has the same account book, it can ensure that the process of account book recording is open and transparent.

3. Yes, but the hardware is constantly updated, so basically don't worry. A transaction only takes about 100 bytes, or 100 kb.

4. Brother, you're kidding. How loud is that? Do you know

5. The three levels are pyramid type, and several switches are connected below the core layer. If the core ports are not enough, they need to be stacked
our school's core uses Nortel 8610, and the expansion only needs to add interfaces. Generally, the core is tested by moles, and adding ports only needs to add moles instead of stacking
an optical switch can be connected under the core, and several layer-2 switches can be connected under the optical switch, which can also save the core port, rece the cost and increase the network users
the specific situation also depends on whether the ports of your core are enough, as well as the core bandwidth, the number of convergence layers, and so on.

6.

This is a data center switch, which supports virtualization, that is VSU. Configuration reference

core switch 1:

Switch1 # configuration terminal
enter configuration commands, one per line. End with cntl / Z.

Switch1 (config) # switch virtual domain 1

Switch1 (config vs domain) # switch 1

Switch1 (config vs domain) # switch 1 priority 200 -- & gt; The default priority is 100, which is configured as a higher priority. After the VSU is successfully established, it will become the management host

Switch1(config-vs-domain)# exit

Switch1(config)# vsl-aggregateport 1 ------> At least two VSL links are needed, and the reliability of one link is low. When link oscillation occurs, VSU will be very unstable

Switch1(config-vsl-ap-1)# port-member interface TenGigabitEthernet 1/1 ------> Configure VSL link, heartbeat link and traffic channel between VSU active and standby cores

Switch1 (config-vsl-ap-1) ﹥ port member interface tengigabit Ethernet 1 / 2
Switch1 (config-vsl-ap-1) ﹥ exit

core switch 2:

switch2 ﹥ configuration terminal
enter configuration commands, one per line. End with CNTL/Z.

Switch2(config)# switch virtual domain 1 ------> Domain ID must be consistent with the first one

switch2 (config vs domain) # switch 2 ----- & gt; The second device must change its ID to 2

switch2 (config vs domain) ｛ switch 2 priority 150

switch2 (config vs domain) ｛ exit
switch2 (config) ｛ VSL aggregateport 1 ----- & gt; At least two VSL links are needed, and the reliability of one link is low. When link oscillation occurs, VSU will be very unstable

Switch2(config-vsl-ap-1)# port-member interface TenGigabitEtherne 1/1 ------> Configure VSL link, heartbeat link and traffic channel between VSU active and standby cores

switch2 (config-vsl-ap-1) # port member interface tengigabit Ethernet 1 / 2
switch2 (config-vsl-ap-1) # exit

7. There are many flights, about 20 minutes there is a bus. Specific telephone consultation 2182221