The OSPF protocol is a widely used protocol. The major reason being “it is not cisco proprietary”. The OSPF also has a good amount of weightage on the certification exam. While working on my CCNP ROUTE I came across a very interesting lab which involved almost all the basic and advanced configuration of OSPF. The OSPF lab included stub areas, summarization, virtual-links , authentication etc. I have designed this lab in GNS3. You can download the topology file and the router configuration files for this OSPF practice lab.
When you need to connect a cisco router or a switch to a windows machine you can use the windows default dialer called hyperterminal. But connecting your cisco router or a switch can be hassle as there is no default dialer present in linux.
When you start studying for cisco ccna exam the only thing that bothers you is the practice lab.There are several simulators available in market to simulate cisco ccna labs .The simulator which i use is GNS3.The GNS3 allows you to simulate any network for practice labs and the main advantage is that it uses real cisco IOS. You can find out about GNS3 and how to configure it from my previous article Step By Step Using And Configuring GNS3 Cisco Router simulator..The first cisco ccna lab that we are going to perform is static routes .I have access to physical cisco hardware but i will be providing you a GNS3 simulator file also . Lets start up by configuring some static routes on cisco routers and get one more step closes to your ccna certification.
If you have Lots of Cisco series routers in your environment you can have the same password for all the cisco routers and cisco switches. But that is not a recommended practice to have the same password for all cisco routers and switch. SO you have to remember a bunch of passwords for the cisco routers and switches and the day comes when you forget the password of you cisco routers and switches.
The same thing happened with me so i thought why now write an article on How To Recover/Reset CISCO Series Router Password Continue reading…
How to Setup SSH Access on a Cisco Router for Security
Telnet connections is not secure the data sent via telnet can be read by a packet sniffer and decoded so it is a security breach . We should avoid using telnet at all the times . we can enable ssh on cisco routers
We need to login to global configuration mode. The first criteria is to set a domain name and hostname of the router on the basis of which the RSA key is generated.
By default cisco routers are not secured they don’t have any passwords set on them anyone within your network can connect to a cisco router and make changes . Which is a security breach and a threat to your network . How can cisco people be so careless that they do not have passwords enabled .
Configuring Banners And Hostnames On A Cisco Router
Configuring banners and hostname can be the most easiest task on a cisco exam .But still sometime people get confused in which type of banner they have to set.Hostname is just an identification we give it to a cisco router its just like the name of the router or the location of the router which helps us identify it .
To configure hostname
Note:- see the router is in the global configuration mode.
There are 4 types of banners that you can set on a cisco router they are:-
- MOTD Banner
- Exec Banner
- Incoming Banner
- Login Banner
The MOTD banner aka the message of the day banner is displayed to one who connects to the router it does not matter how the person connects it may be using console ssh or telnet this MOTD banner will be displayed to him.
Router(config)# banner motd # Welcome to ROUTEMYBRAIN.COM This Is MOTD BANNER #
Note:-The pound (#) is the limiting character it tells that whenever you account this symbol again it means the end of the banner. We can use any sign $,> etc but the sign should be same at the starting of the banner command and the end of banner command
Exec Banner – Whene you enter the EXEC mode this banner is displayed .
Router(config)# banner exec # Welcome to ROUTEMYBRAIN.COM This Is EXEC BANNER #
Incoming Banner-This is used when user use reverse telnet on their cisco routers this is needed when we have an access router in our system.
Router(config)# banner incoming # Welcome to ROUTEMYBRAIN.COM This Is Incoming BANNER #
Login Banner- This banner is shown after the MOTD banner but before the login prompt . It cannot be disabled it has to be deleted
Router(config)# banner login # Welcome to ROUTEMYBRAIN.COM This Is Login BANNER #
Banners can be grateful they can provide user with warnings like do not enter if you are not authorized etc . So it is important so create banners on your cisco routers now . See my video on Configuring Banners And Hostnames On A Cisco Router
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