Why do core switches need VLANs

Without VLANs, everything connected to a switch sits in the same broadcast domain. This means; Address Resolution Protocol (ARP) broadcasts go everywhere. Troubleshooting becomes confusing. VLANs allo...

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Nov 28, 2025

Guide to VLANs: What They are, How They Work, and Why They Matter

How Does a Normal LAN Work? To understand what a VLAN is, you need to understand how a normal LAN really

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Feb 18, 2026

Routing Between VLANs Overview [Networking Software (IOS & NX

VLANs address scalability, security, and network management. Routers in VLAN topologies provide broadcast filtering, security,

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Mar 18, 2026

VLAN Basic Concepts Explained with Examples

VLAN Basic Concepts Explained with Examples A VLAN is a logical grouping of network resources connected to

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Jul 01, 2026

VLANs Explained: What is a VLAN? | How Virtual LANs Work?

Understand What is a VLANs and how virtual LANs help divide big switched networks into smaller, manageable networks with catchy

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Nov 20, 2025

Introduction to VLANs

This lesson explains the basics of VLANs (Virtual LAN), why we need them, how they work, and in what

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Jul 11, 2026

Virtual LAN (VLAN)

VLAN 1 (Default VLAN): The default VLAN on Cisco switches and all switch ports are assigned to VLAN 1 by default. It

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Jul 31, 2025

Solved: Why a coreswitch?

Hi, Having a core switch always depends on the network. On small networks with a couple of

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Nov 18, 2025

VLAN Concept

Back in the old days, a broadcast domain was equal to one physical switch. Every BUM frame was sent out to all switchports except

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Jun 28, 2026

What is VLAN and how it works

A VLAN is a virtual LAN, a subgroup within a local network. VLANs make it easy for network administrators to separate a single

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Nov 18, 2025

VLAN Basics: What VLANs Are, Why They Exist, and How to Use

VLANs exist because most networks need logical separation without duplicating physical infrastructure. Done well,

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Jan 10, 2026

What is a VLAN (Virtual LAN)?

A VLAN, like the LAN it sits atop, operates at Layer 2 of the network, the Ethernet level. VLANs partition a single

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Jan 18, 2026

What Is a VLAN?—IT Glossary | SolarWinds

Saving Costs: Workstations or devices associated with a particular VLAN can communicate via switches, eliminating the need to use

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Jan 24, 2026

Best place to configure VLANs: Core Switch vs Peplink 3?

Hi everyone, I have a question regarding VLAN setup in a network. In my infrastructure, I have a core switch and a

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Aug 27, 2025

What is a VLAN and how does it work?

Static VLANs are manually configured and port-based with each port on a switch representing a VLAN. In a static

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Sep 07, 2025

Routing Between VLANs Overview [Networking

VLANs address scalability, security, and network management. Routers in VLAN topologies provide

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Feb 20, 2026

What is VLAN (Virtual Local Area Network)?

What is VLAN? Discover how Virtual LANs segment networks, boost security, and improve performance—plus how to implement

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Jan 18, 2026

VLANs and Trunking on a Layer 2 Switch: What Should be

This article explains what we did, why we did it, and how we confirmed it worked.

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May 31, 2026

Importance of VLAN Configuration on Network Switches

Discover the power of VLANs! This article explores how Virtual Local Area Networks enhance network security,

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Oct 12, 2025

VLAN : The Importance in Modern Networking

VLAN : The Importance in Modern Networking Advantages of VLAN: Why Logical Segmentation Still Matters

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May 03, 2026

Virtual LAN (VLAN)

VLAN 1006 to VLAN 4094 (Extended VLAN Range): Designed for large-scale networks requiring a high number of VLANs. VLANs in

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Jun 22, 2026

where would a logical vlan be configured on the Core switch, or

Configuring local Vlans I have learned to configure the vlan interfaces on the core switch- and then configure the

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Dec 29, 2025

Configuring a new core switch with VLANs

If the four VLANs are in the same switch and each VLAN has an IP address assigned (i.e. a "VLAN interface" in Cisco

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Apr 11, 2026

Exploring VLAN Security: Importance & Fundamentals | Infosec

However, more recent switches do this with specialized hardware and suffer no performance degradation, allowing

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Apr 13, 2026

What Is a VLAN and How Does It Work? (Simple Explanation)

This simple concept completely changes how switches operate. It''s one of the most fundamental principles in network design and a

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Jan 26, 2026

What Is a Core Switch in Networking?

Unlike access switches, which connect directly to end-user devices, the core switch focuses on aggregating and

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Nov 10, 2025

Do I have to configure new VLANs on the core switch?

If your access/distribution switches connect the user vlans to the core using trunks, then you will need to configure the

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Jan 28, 2026

Understanding VLANs: Purpose and Uses in Modern Networking

By creating virtual segments within a larger physical network, VLANs allow for the separation of devices and traffic,

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Jul 17, 2026

Core Switch vs. Distribution Switch vs. Access Switch

Comprehensive guide to Core, Distribution, and Access Switches. Roles in the network and important parameters explained.

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Nov 21, 2025

creating Vlans at Core layer switches ?

Your core switches have supervisors w/ MSFC in them, so they can do routing and switching. Why wouldn''t you create

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Sep 28, 2025

VLAN : The Importance in Modern Networking

A common misconception is that VLANs automatically secure the network; however, VLANs alone do not prevent all

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Jul 14, 2026

Routed Interfaces on Layer-3 Switches and Internal VLANs

In the Router Interfaces and Switch Ports blog post, I described why we have switch ports and routed interfaces on

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Jul 04, 2026

Switching Architectures: VLANs

Cisco''s Nexus switches run NX-OS not IOS and are Layer-3 switches which could make a good choice for a core router. They can

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Aug 05, 2025

Routing Between VLANs & Layer 3 Switches

This will let us illustrate the concepts of inter-vlan routing, Router on a Stick (RoaS), and Layer 3 Switches (occasionally called

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Oct 22, 2025

Inter-VLAN routing on Core vs Distribution switches

We''re currently upgrading our flat L2 switch topology to a three-tier design using SG-class switches in a building

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