2020.3.24 Wednesday
There is an interview at Shangdi Pioneer Road at 2pm. The content of the interview is a network engineer, the interview company is mainly doing firewall security products.
1. In the morning, a small number of people in the department meeting were drawn to take the exam.
Personal thoughts: Can't sit still, can't learn, can't read the book can't. Graduating from high school does n’t mean ending the study, and it does n’t mean not having to drive a lot of night trains to study.
8: 00-9: 00 Read a post about OSI and TCP \ IP model in csdn.
Idea: Without knowledge, you are not confident. The stronger your learning ability, the more confident. The easier it is to rise.
2. DNS protocol domain name system?
Domain Name System (Service) Protocol
Domain Name System (Service) Protocol (DNS) is a distributed network directory service, mainly used for the conversion of domain names and IP addresses, and the control of Internet email sending.
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following content is transferred from Baidu
Domain name resolution is a service that points the domain name to the website space IP and allows people to easily access the website through the registered domain name. An IP address is a digital address that identifies a site on the network. To facilitate memory, a domain name is used instead of an IP address to identify a site address. Domain name resolution is the conversion process from domain name to IP address. The resolution of the domain name is done by the DNS server.
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What is local DNS and what is root DNS?
The root server is a server in the United States, such as the .com website server is actually in the United States
Network engineer interviews are generally
familiar with Cisco, Huawei switches, routers, and firewalls. Need to build, manage, and maintain capabilities.
The second is familiar with the use of windows2008, linux, unix operating systems. The requirements are the same as above.
The desktop computer moved up from the basement is not lit. Bring the monitors in the basement together.
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ten years of technology, there are only a few principles that can be explained.
What is the principle of DDOS?
First of all, we must understand the types and prevention methods of common computer hacking attacks. The
common principle of ddos attack is to find the data source of the router through the data connection, destroy the Internet or affect the Internet speed.
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most critical piece of the network is the DNS server. It is absolutely undesirable to leave the DNS resolver open. You should lock it to reduce part of the attack risk.
For example, many people use content distribution networks (distributed state) to send files to customers, which is a good way to resist DDoS attacks.
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The interview is like a book, he will test you 2-3 knowledge points, up to 5-6 knowledge points. But this book has more than 50-100 knowledge points. Even the interview content contains more than one field, or more than one book, more than one course.
The seven-layer structure of the OSI network needs to be learned again.
