IEEE 802. 1Q – VLAN Tagging and Trunking in Networking IEEE 802 1Q is the networking standard that defines VLAN (Virtual Local Area Network) tagging on Ethernet frames VLANs allow network administrators to segment a physical network into multiple logical networks, improving security, efficiency, and management The 802 1Q standard introduces VLAN tagging to facilitate communication between VLANs across different network switches
Fundamentals of VLANs - Router on a stick - Cisco Learning Network To decide, which "Vlan Id Number" to attach, to the outgoing frames If the frame is going out of interface numbered FastEthernet 0 0 3, then attach Vlan-3 tag on to it *Click on the image to enlarge Logic The Vlan-Id-Tag that needs to be attached to a frame that leaves the router, is decided by the frames destination Ip address network Note
Fundamentals of creating VLANs - Part 1 - The concept We are going to call the newly created 'Vlan 20' - 'Switch 2', as pictured above, for the purpose of this document Accordingly 'Vlan 20' is the same as 'Switch 2' So additional two switches are a part of the main physical switch And yes, they are blank, without any ports 4 Finally, create the third 'VLAN Switch' Commands: switch#configure
A quick summarized view to Private VLAN (PVLAN) Introduction: This document is anticipated for understanding Private Virtual LAN (PVLAN) concept; how VLAN is sub-divided into isolated sub-domains and the communication between isolated ports types (Promiscuous, Isolated and community ports) To begin with PVLAN, let’s look at the concept of VLAN as a broadcast domain
Best Practices for Inter-VLAN Routing in CISCO Best Practices for Inter-VLAN Routing in CISCO Virtual Local Area Network (VLAN) helps break a large network into smaller, manageable parts, improving security and efficiency However, VLANs are isolated from one another by default, meaning devices in different VLANs cannot communicate unless we enable Inter-VLAN Routing
VLAN1 and VLAN Hopping Attack - Cisco Learning Network The target machine would receive and process the frame, and that would make the VLAN Hopping Attack successful Let’s take an example assuming an attacker is connected to switch A to a port in VLAN1, which is also the native VLAN on the trunk connection between switch A and switch B The target machine is connected to a port to switch B in