Networking

Networking

What Is IP Source Guard? Source Validation and Layer 2 Security

IP Source Guard (IPSG) is a Layer 2 security feature available on Cisco switches that helps prevent devices from using unauthorized…

Networking

What Is Dynamic ARP Inspection (DAI)? ARP Spoofing Protection Explained

Dynamic ARP Inspection (DAI) is a Layer 2 security feature used on network switches to help protect against ARP spoofing…

Networking

What Is DHCP Snooping? How Does It Stop Rogue DHCP Servers?

DHCP automatically provides devices with important network configuration such as IP addresses, subnet masks, default gateways,…

Networking

What Is BPDU Guard and Why Is It Important? Edge Ports and STP Security

Spanning Tree Protocol (STP) protects switched networks from Layer 2 loops. However, STP can also be affected when an unexpected…

Networking

STP Port Roles and Port States Explained

After learning how STP elects the Root Bridge, the next important concept is understanding STP port roles and port states.…

Networking

What Is STP Root Bridge Election? Bridge ID, Priority and MAC Address

In a switched network, redundant links are useful for availability, but they can also create Layer 2 loops. The Spanning…