syslog is a client/server protocol standard uses for forwarding log messages in an IP network. It is typically used for computer system management and security auditing.
Most Cisco devices can use the syslog protocol to manage system logs and alerts.
However Cisco devices does not have large internal storage space for storing its logs. There are [...]
A Cisco IOS Access Control list (ACL) is used to define traffic. Once that “interesting” traffic is defined, some action can then be taken on that traffic.
Logging messages about packets permitted or denied by an IP access list is also available in Cisco IOS.
Logging-enabled ACLs provide insight into traffic as it traverses the network [...]
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 [...]
After connecting a switch to your network, it will be useful if the network administrator can login remotely into it to do troubleshooting, check logging and so on.
The easiest way to manage your switch remotely over the network is to configure an IP address for the default VLAN.
interface Vlan1
ip address 10.2.6.85 255.255.255.0
ip default-gateway 10.1.1.1
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 good to have CCNA credential if you would like to work as a network engineer. It shows that you have the basic foundation in the area of networking especially in the field of Cisco networking. Frankly, it would be easier when you are marketing yourself for a new IT job if you have [...]