Cisco Routers for the Small Business: A Practical Guide for by Jason Neumann

By Jason Neumann

This ebook is meant for the typical community directors or IT pros who
manage small networks and are at the moment utilizing, or are looking to use Cisco IOS-based routers in
their networks. finally, why may still Cisco routers be reserved for elite Cisco authorities when
all you must comprehend are a number of uncomplicated ideas and instructions? This e-book is set a Cisco
CLI for the average man or gal. After examining this booklet, you’ll not need to use cheap
consumer-grade routers in your small enterprise community. You, too, could have the entire reliability
and complex performance that the Cisco IOS deals.

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Extra info for Cisco Routers for the Small Business: A Practical Guide for IT Professionals

Sample text

How to Secure Your Interfaces lab-r1> ena lab-r1# config t lab-r1(config)# int fa4 lab-r1(config-if)# no ip unreachables lab-r1(config-if)# no ip redirects lab-r1(config-if)# no ip proxy-arp lab-r1(config-if)# int vlan 1 lab-r1(config-if)# no ip unreachables lab-r1(config-if)# no ip redirects lab-r1(config-if)# no ip proxy-arp lab-r1(config-if)# exit lab-r1(config)# exit Step 1: Disable IP Unreachable Messages The interface configuration command no ip unreachables prevents a router from generating messages about unreachable destinations.

Use the global configuration mode command interface vlan1 (abbreviated int vlan1) to start interface configuration mode on the vlan1 interface. Did you notice the prompt change? You can always tell when you are in interface configuration mode by the prompt (config-if). Step 3: Add a Description to Your Interface You can add a description to your interface using the command description (abbreviated descr) while in interface configuration mode. This feature can be used to permanently place reminders or other information about the interface in your router’s configuration file.

4. Press the ENTER key to get a command prompt (Router>). CHAPTER 1 ■ GETTING TO KNOW YOUR ROUTER User EXEC Mode Commands User EXEC mode has very limited functionality. You cannot configure your router in this mode. You know you are in user EXEC mode when you see the > symbol after the name of your router. Some useful commands in this mode follow: show version—Displays basic information about your IOS version and router hardware. show flash—Displays the name and size of your compressed IOS image file.

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