When an electronic product is shipped back to the manufacturer from customer for a variety of reasons, normally it will be inspected refitted with different parts as necessary and restored to original specification. After that it maybe repackaged for resale. However, the item can no longer sold as “new”, but can only be sold as [...]
We can use VLAN ACL (also called VLAN map) to provide packet filtering for all types of traffic that are bridged within a VLAN or routed into or out of the VLAN. Unlike Router ACL, VACL is not defined by a direction (input or output). When you configure a VACL and apply it to a [...]
The default VLAN on all switches is VLAN 1.
By default, all ports in a Cisco switch belong to VLAN 1. With all ports in the same VLAN (in this case VLAN 1), all ports can communicate with each other without going through a router.
Sometime you may like to limit only certain IP address to access your Cisco router / switch by using telnet. You may implement it by configuring the access list and apply it to the line vty 0 4 line.
One of the way to secure a Cisco router / switch is to encrypt password in it.
In order to encrypt passwords that are saved in the Cisco devices configuration file, you may use the “service password-encryption” global configuration command.
This command should be used as a simple cipher to prevent unauthorized users from viewing the passwords [...]
In my previous post on Static route configuration, I have touched on some basic of static route configuration. In this post, I will show you more details on how to configure static routing in Cisco devices.
IP routing is enabled on Cisco routers by default. If it has been previously disabled on your router, you can [...]
It is important to understand the process of routing if you are interested in learning networking. One of the fundamental of this study is static routing. Static routing is not complicated, but it is the basic. We need to understand the basic in order to learn the advanced topics.
Static routing is the process of configuring [...]
Private Addressing
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255