Use Layer-3 Switch or Router?
In general, you want to use a router when most of the time the device does routing. Likewise, you want to use a switch when when most of the time the device does switching. This statement becomes more apparent when…
Category: How-to
Secure SNMP in Cisco Switches and Routers
This article focus on the ways how we can secure SNMP access in Cisco Switches and Routers Simple Network Management Protocol (SNMP) uses the default UDP port 161 for general SNMP messages and UDP port 162 for SNMP trap messages. SNMP is a service used to perform network…
How to Configure SNMP on Cisco IOS-based Router/Switch?
SNMP is an application-layer protocol that provides a message format for communication between SNMP managers and agents. The SNMP manager is the system used to control and monitors the activities of network hosts using SNMP; this is also called Network Management Station (NMS). This article explains how…
Cisco 3750 Stacking Configuration
Process for replacing a failed master switch in a Cisco 3750 switch stack 1. Upgrade or downgrade the software on the replacement switch to match the rest of the switch stack The version of IOS running on the switch must…
The Way to Activate Your Cisco ASA 5500
We will show the Latest to activate the Cisco ASA 5500 firewall. Detailed info you can check as follows (Taken from Cisco’s Forum) CiscoASA# show activation-key Serial Number: ************ Running Activation Key: 0x7905c844 0x2c16a53f 0xe430dd6c 0xa6e428a8 0x05260b8b Licensed features for…
How to Connect to Cisco ASA?
Although Cisco ASA by default ships with a configuration that already includes 2 preconfigured networks, (Outside network and Inside network configured to 192.168.1.0 subnet with configured DHCP server), which provides an easy way for establishing initial connection over Ethernet, there might be…
Cisco ASA 5520 Basic Configuration Guide
The bellow is a quick start to get your Cisco ASA off the ground by the means of a few print screens It provides an easier way of explaining how to connect to the system for common tasks without the…
Configuring Static NAT on a Cisco ASA Security Appliance
Two of the most common forms of network address translation (NAT) are dynamic port address translation (PAT) and static NAT. PAT is the many-to-one form of NAT implemented in many small office and home networks where many internal hosts, typically…
How to Configure VLAN, STP, DTP Step by Step Guide?
In this tutorial we will demonstrate that how can you Configure Access or Trunk links Create VLAN Assign VLAN membership Configure Intra VLAN routing Configure VTP Server Make VTP Clients Show STP Static Configure DTP port To complete these labs…
How to Configure Dynamic DNS on a Cisco Router?
The Internet uses IP addresses to refer to all resources but IP addresses are difficult to remember for humans. We instead use easy-to-remember domain names such as www.router-switch.com to refer to Internet resources. DNS (Domain Name System) is the Internet directory…
DHCP Option 150 & DHCP Option 66
What is the DHCP? Watch the introduction: Here we will provide an understanding for configuring option 150 and to use option 66 for EX Switches. DHCP Option 150 is Cisco proprietary. Option 66 is an IEEE standard. PROBLEM OR GOAL:…
Networking Tutorial Goes to Basic PPP Configuration
This tutorial will be going over Basic Configuration of PPP (Point-to-Point Protocol). It includes Basic Configuration tasks on a router, configuring OSPF routing protocol, and configuring PPP PAP and CHAP authentication. … Look at the above diagram, we will be using…
Routing Information Protocol & RIP Configuration
Introduction to Routing Information Protocol (RIP) IP RIP (Routing Information Protocol) comes in two different versions: 1 and 2. Version 1 is a distance vector protocol (RFC 1058) and Version 2 is a hybrid protocol (RFCs 1721 and 1722). Routing Information Protocol Version 1…
How to Configure IGRP (Interior Gateway Routing Protocol)?
Interior Gateway Routing Protocol (IGRP) is a distance vector interior routing protocol (IGP) invented by Cisco. It is used by routers to exchange routing data within an autonomous system. IGRP is a proprietary protocol. IGRP was created in part to…
CCNP SWITCH 642-813 Guide: Configuring IP SLA
A key topic on the CCNP SWITCH exam, the Cisco IOS IP Service Level Agreement (IP SLA) feature, can be used to gather realistic information about how specific types of traffic are being handled end-to-end across a network. In this…
How to Use Cisco IP SLA to Manipulate Route Forwarding Decisions?
Cisco’s IP SLAs are one of the most versatile tools we have as network engineers. You can monitor various things from TCP connection times to device availability via ICMP ping. (See here for a more exhaustive list.) With endless possibilities comes great fun!…
How to Configure Cisco IP SLA?
Cisco IOS IP SLA (Service Level Agreement) is a tool that can be used to generate synthetic network traffic used for network management. SLA can be configured to send TCP connects, ICMP or even UDP packets. These packets can be…
How to Configure Basic NAT with Overloading?
Here’s a lab that might be helpful for those working towards the CCNA examination. We have a simple topology consisting of three routers. R8 will simply be used as a host on our “internal” network and R7 will be used…
How to Configure Static NAT for Inbound Connections?
Someone recently asked me how to configure Network Address Translation (NAT) so that computers on the Internet could access his internal Web and mail server through his Cisco router. This requires configuring a static NAT translation between the dedicated public…
How to Set up NAT Using the Cisco IOS?
Network address translation (NAT) is one of those rare information technology buzzwords that do exactly what its name implies. In this case, it translates one network address into another network address. The most popular use for NAT is to connect…
How to Configure Dual ISP on Cisco ASA 5505?
This is article that explains how to configure dual ISPs on a Cisco ASA 5505 firewall for redundancy purpose. Suppose we have a primary high-speed ISP connection, and a cheaper DSL line connected to a Secondary ISP. Normally all of our traffic should…
How to Configure NAT in Cisco IOS?
NAT (Network Address Translation), it in simple terms translates an IP address into another. Network Address Translation is of different types like Static NAT (One to One) Dynamic NAT (Many to Many) Overloading (Many to One) The main purpose of…
