Author: upravnik

A rollover cable is usually shipped with each Cisco device. This cable connects a serial port on your computer to the console port of the device and it is used for the device’s initial configuration. It is called rollover because Read More …

We’ve learned it is possible to configure local usernames and passwords on a Cisco device and then use them to login to the device. To do this, we’ve used the username USER password PASSWORD command, like in the example below: Read More …

By default, any single word entered on an IOS device that is not recognized as a valid command is treated as a hostname to which you want to telnet. The device will try to translate that word to an IP Read More …

By default, an IOS device will disconnect a console or VTY user after 10 minutes of inactivity. You can specify a different inactivity timer using the exec-timeout MINUTES SECONDS line mode command. For example, to disconnect a console user after Read More …

By default, IOS displays syslog messages to the console users at any time, even during the typing of a command. Consider the following example: R1(config-if)#ip address 192.168.0.100 255.2 %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to down 55.255.0 Notice Read More …

Cisco routers can be configure as both DHCP servers and DHCP clients. An interface on a router that connects to the Internet Service Provider (ISP) is often configured as a DHCP client. This way, the ISP can provide the IP Read More …

The status of an interface on a Cisco switch can be checked using the show interface TYPE exec mode command. Consider the following example: SW1#show interfaces fa0/1 FastEthernet0/1 is up, line protocol is up (connected) Hardware is Lance, address is Read More …

In certain scenarion you might want to remove the existion configuration of an Cisco IOS device and restore the device to the factory settings. To do this, you will need to access the device over the network or through the Read More …

Since TCP is a connection-oriented protocol, a connection needs to be established before two devices can communicate. TCP uses a process called three-way handshake to negotiate the sequence and acknowledgment fields and start the session. Here is a graphical representation Read More …

The exec mode show version command displays information about the device, such as: the IOS version running on the device number of interfaces device model time of the last reboot amount of memory available on the device   Here is Read More …