First, a data packet comes over, the router's network interface will determine a frame through the special marks of the frame header and the frame end and do a CRC check on the frame.

If you download the Fiddler software from the Internet, if it is the original signature of the manufacturer, the operating system will help you verify whether the signature is legal during installation. 

The optical fiber connector is composed of optical fibers and plugs at both ends of the optical fiber. The plugs are composed of pins and peripheral locking structures. According to different locking mechanisms, optical fiber connectors can be divided into FC type, SC type, LC type, ST type and KTRJ type.

Terminal access refers to the connection of terminal devices and routers, and the completion of data communication between terminal devices and other terminal devices through routers.

The number of antennas has nothing to do with the signal strength. There are two factors that affect the signal strength of the router and the wall penetration.

AAA is short for Authentication, Authorization and Accounting. It is a security management mechanism for access control in network security. It provides three security services: authentication, authorization, and accounting.

The most comprehensive cisco basic commands in history, including vlan, rip, ospf, nat and so on. Strongly recommend collection!

The firewall classification that network engineer security technology CCIE and HCIE should understand. In order to have a certain grasp of firewalls, today we will briefly understand the categories of firewalls and introduce the similarities and differences between the categories.

As a network administrator or network engineer, it is important to always pay attention to the speed of network delivery. Not only do you need to ensure that you have a good response time, but you also need to ensure that the speed of the network is sufficient for every path that users need to communicate. And manually testing each path will take up all your time.