So why do I say that CBT certification training is more useful than the traditional methods of training. The first reason I have is that I can watch the videos and read the learning material unlimited number of times while if we’re in a training class, we get a chance to listen to the teacher only once.

There may be an advantage of attending the classes because of the environment of the institute and the physical equipment available for hands on training in case of technology certifications like Cisco CCNA or Microsoft MCTS but the fact is that we can get near to perfect simulators of the physical products very easily. This can lead us to sitting and watching the CBT training videos sitting in the comfort of our home.

What do you people think of attending the training classes in real time versus watching CBT training videos at home?

Juniper J Series router models J2320 and J2350 are used for small offices while J4350 series routers are used for medium sized branch offices. Juniper gives you an option for J6350 routers if you have large branch or regional offices.

The services provided by these routers include VOIP, PIM slots for additional LAN/WAN connectivity, IPv6, IPSec, MPLS, firewall, Quality of Service (QoS), multicast, VPN, security services etc.

Juniper J Series router runs JUNOS which is Juniper proprietary network operating system. I hope this is informative enough to get an idea about the Juniper J-Series routers. If anyone has more information and wants to share it with us, please share with us in comments.

Certhacker#copy tftp flash:
Address or name of remote host [192.168.1.1]?
Source filename [c2600-i-mz.121.T.bin]? c2600-i-mz.121-1.T.bin
Destination filename [c2600-i-mz.121-1.T.bin]?
Loading c2600-i-mz.121-1.T.bin from 192.168.1.1 (via Serial0/0): !
%Error copying tftp://192.168.1.1/c2600-i-mz.121-1.T.bin (Not enough space
on device)
Certhacker#

Resolution:

The solution to this problem is to delete the existing files residing in the flash. To see the items in flash, issue the following command:

Certhacker#dir flash:

If you want to backup the files currently residing on flash, issue the following command:

Certhacker#copy flash tftp

This command will ask for the file name which you want to copy to tftp server.

When you’re done with the backup, issue the following command to delete all the files in flash:

Certhacker#erase flash:

This will delete all the files in flash and you’ll be able to install the new IOS without the error message which you were previously getting.

SQL BPA command line has encountered a problem and needs to close

Just go to the following directory and create a folder named BPAClient.

C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\BPA\

Now go to C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\BPA\Bin and copy BPAClient.dllC:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\BPA\BPAClient file and paste it in

Try installing SQL Server again and hopefully it should work.

To break out or exit from a running command like telnet just press CTRL – SHIFT – 6. This command will take you to your original prompt.

I’m planning to have a forum where we can share everything like this. Today I’m going to share with everyone the latest version of Pass4Sure CCNA 640-802 Exam which was updated in January 2010. There are 60 questions in total and it’s in the form of a Word document. It can be downloaded from the following URL:

If anyone wants to dig down deep to understand NAT, he can go to the following Wikipedia article:

http://en.wikipedia.org/wiki/Network_address_translation

Now let’s start by configuring a basic NAT on a Cisco router. The type of NAT we are going to configure here is Overloading. This means that we will map one public IP address to many private or local IP addresses.

The other types of NAT are:

1. Static NAT (One to One)
2. Dynamic NAT (Many to Many)
3. Overloading NAT (Many to One) [This is the one we are going to configure here]

Let’s have a look at a few NAT terminologies:

Inside Local is the IP address of the private host in the local network.

Inside Global is the IP address that other people will see from outside as your IP address

Outside Local is the IP address that the private host will see as the remote host IP address

Outside Global is the IP address that is connected to our router (public interface)

Let’s understand it with a real example.

Suppose you are sitting in a private network and your host IP address is 192.168.1.10 and your router IP address is 219.89.34.2 (this is the public IP address given by the ISP). You want to connect to google.com whose IP address is 74.125.127.100.

Let us identify the IP addresses here:

Inside Local – 192.168.1.10

Inside Global – 219.89.34.2

Outside Local – 74.125.127.100

Outside Global – 74.125.127.100

Now that we have some understanding about NAT terminologies, we carry on with the configuration.

Enter global configuration mode

Certhacker#configure terminal

Enter the interface mode on which we want to configure NAT inside (the internal side of the router pointing towards the local area network.

Certhacker(config)#interface fastethernet0/1

Assign an IP address on the interface

Certhacker(config-if)#ip address 192.168.1.1 255.255.255.0

Enable it as NAT inside

Certhacker(config-if)#ip nat inside

Go back to global configuration mode and enter the public interface of the router on which we have to configure the public IP address assigned to us by our ISP.

Certhacker(config)#interface serial0/0/0

Assign an IP address on the interface

Certhacker(config-if)#ip address 219.89.34.2 255.255.255.248

Enable it as NAT outside

Certhacker(cnofig-if)#ip nat outside

Configure NAT pool of all the public IP addresses given by our ISP. In our case it’s only one.

Certhacker(config)#ip nat pool WANPOOL 219.89.34.2 219.89.34.2 netmask 255.255.255.248

Create an ACL to allow our newly created NAT to work

Certhacker(config)#ip access-list 10 permit 192.168.1.0 0.0.0.255

Configure the NAT Pool to be used with the Access List

Certhacker(config)#ip nat inside source list 10 pool WANPOOL overload

Configure the default route to allow internal traffic to pass through our public interface

Certhacker(config)#ip route 0.0.0.0. 0.0.0.0 serial0/0/0

This is all. NAT overloading is configured and should work properly. Hopefully this tutorial is useful for people. Thanks for reading. Please comment about your experiences.

To see the version of IOS, there is one command which give a detailed overview of the software installed on the system (Cisco router or switch).Lets issue the command:

Certhacker#show version

The following sample information will be shown:

Show version will provide the following information:

• The version of the IOS
• Configuration register
• Hostname of the device
• The version of the ROM bootstrap
• The version of the boot loader
• The last way, time and date to power off the device
• Uptime of the device
• RAM
• Information about device hardware like Processor ID etc.
• Information about the interfaces installed on the device

It also show some additional information in case of a switch:

• The MAC addresses of all the interfaces on the switch
• Installed features like encryption etc.
• Time and date of configuration file modification

If you want to practice this command, you can use the router simulation in the following page:

Show Version Command Practice Simulation

So let’s start:

Enter global config mode

Certhacker#configure terminal
Enter configuration lines, one per line. End with CNTL/Z
Certhacker(config)#

Create Access list to permit a network

Certhacker(config)#access-list 20 permit 192.168.1.0 0.0.0.255

This will create an access list no. 20 which will permit the network 192.168.1.0/24. Now we need to apply this access list to a vty line.

Apply access list to router’s virtual terminals

Certhacker(config)#line vty 0 4
Certhacker(config)#access-class 20 in

Now see the access list applied

Certhacker#show access-list

This will show the recently applied access list 20. Please note that there is an implied deny all at the end of each access list that will deny all other networks other than the permitted ones.

Try this tutorial live on the following simulation lab:

CCNA Simulation Lab Access List Tutorial

Somebody told me in comments that the Pass4Sure CCNA 640-802 dumps have been updated. The latest version is 7.63. The latest version comes as an auto installer which can be downloaded from the following URL:

Please tell me if you need anything regarding Cisco. Please share all the Cisco material with everybody here so everybody gets the touch of knowledge and expertise.

Note: This article has been given only for informational and educational purpose. We do not encourage pirated or illegal software. No responsibility of Certhacker team. Use at your own risk. In case of any issues, please contact us through comments.