Cisco - Ping Labz (Page 8)

VLAN Design for Campus Networks: From Access to Core

A good VLAN design scales cleanly, keeps STP domains small, and makes troubleshooting obvious. Here is how to plan VLANs for a multi-building campus network.

7 min read Apr 1, 2026

VLAN public

VLAN Security Hardening: Protecting Your Layer 2 Network

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VLANs provide segmentation, not security. Without explicit hardening — disabling DTP, fixing the native VLAN, enabling DHCP snooping and DAI — your Layer 2 network is wide open to attack.

7 min read Apr 1, 2026

VLAN public

Troubleshooting Inter-VLAN Routing: SVIs, Router-on-a-Stick, and ARP Issues

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Inter-VLAN routing failures are usually caused by SVIs in down state, missing routes, DHCP misconfiguration, or ARP timeouts. Learn to diagnose and fix them systematically.

10 min read Apr 1, 2026

VLAN public

Troubleshooting VLAN and Trunk Problems on Cisco Switches

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Most VLAN outages stem from ports in the wrong VLAN, trunks not allowing required VLAN, or native VLAN mismatches. Here's how to diagnose and fix them systematically.

7 min read Apr 1, 2026

VLAN public

Private VLANs on Cisco Catalyst Switches: Isolated and Community Ports

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Private VLANs let you enforce micro-segmentation within a single VLAN—isolating hosts completely or grouping them into communities while keeping them behind a single gateway IP.

5 min read Apr 1, 2026

VLAN public

Configuring Voice VLANs on Cisco Switches for IP Phones

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Voice VLANs let a single access port carry both data traffic from a PC and voice traffic from an IP phone — each in its own VLAN with its own QoS treatment.

7 min read Apr 1, 2026

VLAN public

Inter-VLAN Routing on a Layer 3 Switch: SVI-Based Routing on Catalyst 9000

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Layer 3 switches route between VLANs in hardware at wire speed — no external router bottleneck. Here is how to configure SVI-based inter-VLAN routing on a Catalyst 9300.

8 min read Apr 1, 2026

VLAN public

Inter-VLAN Routing with Router-on-a-Stick on Cisco IOS XE

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When you don't have a Layer 3 switch, router-on-a-stick provides inter-VLAN routing via a single physical link split into subinterfaces. Learn when this design is appropriate, how to configure subinterfaces, and why it's a bandwidth bottleneck.

10 min read Apr 1, 2026

VLAN public

How VLANs Work: Tagging, Broadcast Domains, and Frame Forwarding

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VLANs are more than a configuration checkbox — they change how every frame is tagged, forwarded, and filtered inside the switch. Here's the mechanics.

7 min read Apr 1, 2026

VLAN public

What Is a VLAN? Virtual LANs Explained for Network Engineers

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VLANs let you carve one physical switch into multiple isolated broadcast domains — without buying more hardware. Here's how they work and why every network uses them.

6 min read Apr 1, 2026

Cisco public

Configure Single Area OSPFv2 on Cisco Routers: Complete Lab Guide

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Learn to configure and verify single-area OSPFv2 on Cisco routers with complete Router ID setup, network commands, and wildcard masks. Includes hands-on Cisco CML lab with full verification outputs and troubleshooting steps.

8 min read Oct 31, 2025

CCNA public

How to Configure Hostname on Cisco Router (Step-by-Step Guide)

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Learn how to configure a hostname on your Cisco router using simple CLI commands. This guide explains why hostnames matter, how to save changes, and best practices for network organization.

4 min read Oct 30, 2025