Course Elementary  3565

Course Introduction：If you have any questions, add WeChat: Le-studyg; this course is an in-depth exploration of the internal working principles of computer systems. It starts from the macro application level and gradually goes down to the bottom of the hardware, revealing how all levels of the computer system work together. By studying this course, students will master the entire process from application software to hardware implementation, laying a solid foundation for future technology research and development and innovation.

Course Intermediate  8374

Course Introduction：Many programmers who have worked for many years still have a very basic understanding of databases. They are confused as soon as they go out for interviews. They don’t understand basic SQL statements, more complex SQL queries, and SQL statement optimization. They don’t even know how to use them. Redis improves system performance and can withstand tens of millions of concurrencies. This set of courses will help you thoroughly understand MySQL locks, execution plans, indexes, MVCC & Redis transactions, cache, breakdown, penetration, avalanche, warm-up, etc., and you can complete all database interviews in one set!

Course Intermediate  11361

Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.

Course Advanced  17663

Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.

Course Introduction：Application layer protocols include: 1. Domain name system DNS protocol, FTP file transfer protocol, telnet remote terminal protocol, HTTP hypertext transfer protocol, SMTP email protocol, POP3 email reading protocol, Telnet remote login protocol, SNMP simple network management protocol wait.

2020-11-23 comment 0  79412

Course Introduction：The classification of application layer protocols is: 1. Domain Name System; 2. File Transfer Protocol; 3. Simple Mail Transfer Protocol; 4. Hypertext Transfer Protocol; 5. Simple Network Management Protocol; 6. Remote Login Protocol.

2020-12-01 comment 0  42641

Course Introduction：snmp is an application layer protocol. SNMP (Simple Network Management Protocol) is a standard protocol specially designed for managing network nodes in IP networks. It is located at the top level (ie, application layer) of the ISO/OSI and TCP/IP network models. It is an application layer protocol and is at the transport layer. Rely on UDP protocol for transmission.

2020-11-12 comment 0  36422

Course Introduction：TCP/IP protocol includes link layer, network layer, transport layer and application layer. In computer networks, the actually applied network protocol is the TCP/IP protocol family. The application layer of TCP/IP generally corresponds to the application layer, presentation layer and session layer of the OSl/RM model. The network interface layer of TCP/IP corresponds to the OSI data link layer and physical layer.

2019-07-23 comment 0  35972

Course Introduction：Eight common application layer protocols: 1. DNS domain name system; 2. FTP file transfer protocol; 3. Telnet remote terminal protocol; 4. HTTP hypertext transfer protocol; 5. SMTP email protocol; 6. POP3 email reading protocol ;7. SNMP Simple Network Management Protocol; 8. TFTP Simple File Transfer Protocol.

2021-07-23 comment 0  59733