Author: upravnik

Just like regular hosts, if a Cisco router wants to exchange frames with a host in the same subnet, it needs to know its MAC address. The IP-to-MAC address mapping are kept in the router’s ARP table. Consider the following Read More …

An URL is a string of characters that contains information about how to fetch a resource from its location. An URL specifies the primary access mechanism and the network location of a resource. A typical URL consists of the following Read More …

In one of the previous lessosn we’ve defined a static route for a specific subnet by using the subnet mask of 255.255.255.0 in the ip route command. IOS also allows you to specify a static host route for a single Read More …

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 …