The empirical rule of PCB design: "place a 1 ~ The 10μf Capacitor Filters out low-frequency noise. A 0.01 ~ The capacitance of 0.1 μF is used to filter out high-frequency noise ." Rule of first choice (rule of thumb ). Everyone who works on the circuit knows that some small capacitors need to be placed near the chip. How big is it? How much? How to put it?
Two common simple concepts.
In advance you need to know how your site is being attacked. The following two types of attacks are common:1, traffic attacks, which is what we often call DDoS and Dos attacks, which are the most common bandwidth attacks in traffic attacks, typically use a large number of packets to overwhelm one or more routers, serve
application needs.
Provides free snapshot backup services, usually without additional cost of backup.
3, hardware redundancy security and reliability
Natural Defense ARP attacks and Mac spoofing, strong ability to resist DDoS attacks.
Based on the large server cluster, all hardware redundancy, single point failure rate is almost zero.
What about the Aliyun
Webshould bewith fire protectionWallis setWebAnti-Protection, netpageWarrantyProtection,LoadBalanced,should bewith deliveryin one of theWebOverall safety PreventionProtective Equipmenta piece ofProductionProducts . Web firewall products deployed in front of the Web server, serial access, not only on the hardware performance requirements, and can not affect the WEB services, so ha function, bypass functionality is necessary, but also with load balancin
Solution:1. The driver has not been certified, resulting in 100% of CPU resources. A large number of beta drivers are flooding the Internet, leading to hard-to-find fault causes.2. Faults caused by anti-DDoS and anti-virus software. Some anti-virus software has added random monitoring of web pages, plug-ins, and emails, which undoubtedly increases the burden on the system. You can choose to enable the service as needed.3. Viruses and Trojans. A large
; drop table [bin_cmd];
It means to back up our website to the 1. asp file under the e disk. Of course, we can back up some dangerous commands to the system startup items through this call, so as to achieve some Elevation of Privilege operations.
We continue to find that we need to wait for the Administrator to log on or restart, but the Administrator may not log on for a long time. Of course, we can only use some very effective means. DDOS
What is the Aliyun server advantage?
Cloud Server ECS has the advantage of not having traditional servers and virtual hosts:
Stability: Service availability up to 99.95%, data reliability up to 99.99%. Support for downtime migration, data snapshot backup and rollback, and system performance alerting.
Disaster Recovery backup: Multiple copies of each data, a single damage can be quickly recovered in
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