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How to Configure a Loopback Interface on Cisco Router & Switch

A loopback interface is a virtual interface that can be created within a network device and behaves much the same as a physical interface.  Loopback interfaces can be configured on a Cisco router or a switch and have many uses.  In this article, we’ll examine what they are, how they can be configured, and how […]

Filed Under: Cisco Routers, Cisco Switches

Cisco Switch Layer2 Layer3 Design and Configuration

Layer2 and Layer3 switches are the foundation of any network. After all, any network devices (routers, firewalls, computers, servers etc) have to be connected to a switch. Sooner or later, as a network engineer you will be faced with the task of deploying a switch network for a customer or for your own company. Therefore, learning […]

Filed Under: Cisco Switches

Description of Switchport Mode Access vs Trunk Modes on Cisco Switches

In this article, we will discuss a couple of core concepts of network switching which are about Access and Trunk ports and how to configure them using “switchport mode access” and “switchport mode trunk” commands on Cisco switches We will also delve into what a VLAN is, why they’re used and how all of this […]

Filed Under: Cisco Switches

What is an SFP Port-Module in Network Switches and Devices

A Small Form Factor Pluggable (SFP) Port on a network switch is an Ethernet Interface which has been designed to allow a small module (which contains a connector and small circuit board) to be inserted into the switch. This device is called an SFP Module. There are different types of SFP modules and SFP ports, […]

Filed Under: Cisco Switches, General Networking

8 Different Types of VLANs in TCP/IP Networks

A VLAN (Virtual Local Area Network) is a fundamental concept in TCP/IP computer networks and every professional in this field must have a deep understanding of this technology. In networking, VLANs are implemented and configured on Ethernet Switches and they work at OSI Layer 2. They are a method to logically separate Layer 2 Ethernet […]

Filed Under: Cisco Switches, General Networking

The Most Important Cisco Show Commands You Must Know (Cheat Sheet)

If you are a networking professional that is operating and supporting Cisco devices and networks, then learning some important “show commands” is essential. There are a few different categories of commands on Cisco devices. There are commands that configure the device to perform a certain function and also there are commands that extract information from […]

Filed Under: Cisco Routers, Cisco Switches

Traffic Filtering on Cisco Layer3 Switches using ACL and VACL

Cisco devices offer excellent features for traffic filtering. The classic Access Control List (ACL) is the core mechanism on Cisco network devices (routers, switches etc) which is mainly used for traffic filtering. In this article we will examine a different type of ACL, called the Vlan Access Control List (VACL) which works a little different […]

Filed Under: Cisco Switches

How to Configure Cisco Router-on-a-stick with Switch

In this post I will explain how to provide routing between two VLANs on a simple Layer 2 switch using a Cisco router with just one interface. This is called also Router-on-a-stick. This configuration is usually asked as a question in CCNA exams, so I hope it will be helpful for people preparing for certification. […]

Filed Under: Cisco Switches

Cisco DHCP Snooping Configuration – What is DHCP Snooping?

Nowadays enterprises should deploy any available defenses they have available in order to eliminate, or at least minimize, possible attacks in their networks. Security controls should start from the network itself and span the whole IT infrastructure up to the application level. In this article I will describe a simple and effective security protection which […]

Filed Under: Cisco Switches

What is VLAN Trunking and VTP – Configuration Example and Description

There are some networking terms and concepts that are so fundamental and important that every TCP/IP networking professional must know them by heart. One of these fundamental concepts is VLAN Trunking. What is VLAN Trunking in Networking? A VLAN Trunk falls into Layer 2 of the OSI model and is related to network switching. When […]

Filed Under: Cisco Switches

10 Different Types of Network Ethernet Switches for Small or Large Networks

Network Switches form the backbone of computer networks and are one of the main building blogs of a Local Area Network (LAN). A network switch usually operates at Layer 2 of the OSI model (working with the Ethernet protocol) but there are switch models that implement also routing, which can be considered as Layer 3 […]

Filed Under: Cisco Switches

Cisco Show Interface Command on Routers and Switches Explained

One of the most useful and popular commands used on Cisco devices is the “show interface” command. It can be very useful at troubleshooting connectivity issues and physical port issues, check the status of physical ports, watch how much traffic is passing through the interface, which IP address is assigned to the interface (for Layer3 […]

Filed Under: Cisco Routers, Cisco Switches

Layer 2 VLAN Configuration on a Cisco Switch (with Example)

This post will deal with creating Layer 2 VLANs on Cisco switches and performing all relevant configurations. Up to 4094 VLANs can be configured on Cisco catalyst switches. By default, only VLAN 1 is configured on the switch, so if you connect hosts on an out-of-the-box switch they all belong to the same Layer 2 […]

Filed Under: Cisco Switches

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About Networks Training

We Provide Technical Tutorials and Configuration Examples about TCP/IP Networks with focus on Cisco Products and Technologies. This blog entails my own thoughts and ideas, which may not represent the thoughts of Cisco Systems Inc. This blog is NOT affiliated or endorsed by Cisco Systems Inc. All product names, logos and artwork are copyrights/trademarks of their respective owners.

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