H3C Network Troubleshooting Methods

1. Connected the PC directly to the layer 3 switch, and the PC is able to access the internet normally, ruling out any issues with the layer 3 switch.

2. Connect the problematic PC under Layer 2 Switch A to Layer 2 Switch B, configure the corresponding IP, subnet mask, and gateway. The PC can access the internet normally, eliminating any issues with the PC itself.

3. Checked the A interface status of the second-layer switch and found the port UP, indicating a secure network device agent. However, there is a total traffic of 50% broadcast packets under the interface, which may suggest two issues: A. Network Loop B. ARP Attack

4. The network design is in a tree-like serial structure, and there are no cables forming loops at any interfaces, eliminating the possibility of network loops.

5. Continue to monitor the broadcast packet traffic of each interface under Layer 2 switch A, disconnect the interface with abnormal broadcast packet traffic, ensure network device security pricing, and restore the network of other PCs to normal.

What is H3C Networking?

The term "network" originally refers to a vast virtual image that connects everything, and it can also be used as a verb. In the realm of computer science, a network is the connection of various isolated workstations or hosts using physical links to form data links, thereby achieving the goals of resource sharing and communication. A system that connects multiple computer systems, which are geographically dispersed, have network security, and possess independent functions, through communication equipment and lines, and utilizes comprehensive network software (such as network protocols, information exchange methods, and network operating systems) to enable network resource sharing.

Basic Principles of H3C Networking

Router

Routing: Routing is the information that guides the path for sending IP packets. It can also be understood as the process of finding a path.

Router: A router has routing capabilities, serving the purpose of packet forwarding.

Firewall

The firewall serves as the first line of defense for the system, its role being to prevent unauthorized users from accessing. It acts as a barrier between the internal and external networks, controlling the incoming and outgoing data packets according to the rules pre-defined by the system administrator.

2. Types of Firewalls

Network Layer Firewall, Application Layer Firewall, Database Firewall

Internet

Local area networks are interconnected by an operator to form the Internet.

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