Learn How To Configure Router with CompTIA Network+ Certification
Computer network has become one of the most essential element of information technology as people has establish small and large computer networks at personal as well as organizational level. One of the most important aspects of a network is router. Router transmits packet data between two or more networks connected together. It identifies the destination address from data packet and route it to the desired destination, so router has become an essential element of modern networking. If you have established or looking to establish a computer network then you must know the technicalities to set up router. You must be thinking how to set up a router? Well, we’ll discuss that in detail. These days there are numerous vendors that are manufacturing router but Cisco is the most popular and reliable one, so begin with let suppose we have Cisco’s router.
In order to install router in a network we have to configure it, there are numerous emulation tools such as Putty and securecrt. We are going to use putty as terminal emulation with a computer having Windows 7 operating system. Once you have selected terminal emulation program and computer, you have to connect serial cable in to serial or (COM) port of the computer and the other end should be attached to router’s console port. Once the cable is connected, initiate putty and choose your connection type, specify COM port, set connection speed to 9600 baud and click ‘Open’. Up till now the router must be ON and it you are not getting any response on router, hit Enter. The router will show the default prompt given by Cisco IOS factory.
Before moving on further, let us discuss how Cisco IOS is organized. Cisco’s Command Line Interface (CLI) is developed on the basis of modes. These modes indicate what sort of commands and configurations are available, one can switch between modes in order manipulate router configurations. But before working in modes one must understand the difference between them. When the router starts, it is in EXEC mode, this is the first mode which allows you access to the basic unprivileged commands such as:
Ping: Allow you to identify TCP/IP network issues and help resolving them.
Telnet: It’s a terminal emulation which allow user to connect a host or device remotely on the basis of telnet client using port 23.
Show: Show commands are used to gather system information, in order to check the list of show commands use ‘?’.
In order to configure router we have to switch to privileged mode, type enable command to switch from unprivileged mode to the privileged one. Normally, the privileged mode is protected by password but with default factory settings you don’t have to enter password. Now, you are in privileged mode but an important thing to consider here is that how can you keep track of different modes because the command line interface changes every time you switch the mode. When router switched from unprivileged to privileged mode it displays
Other then these two modes, there many sub-modes as well but we don’t need to discuss them right now.
Global Configuration Mode
In order to perform any sort of changes in router configurations, you have to enter in global configuration mode. Once you are in global configuration mode it displays:
Router#conf tEnter configuration commands, one per line. End with CNTL/Z.Router(config)#
Using global configuration mode you can set system-wide or global configuration and one of the most commonly use commands is to set router hostname.
By this command the router hostname is changes to NETWORK-plus as indicated with the hostname command. Another common command is enable secret command.
Note: The ‘end’ command will take you back to the privilege EXEC mode.
Interface Configuration Mode
In order to perform any kind of changes to the router interface, you have to switch to Interface Configuration Mode which has some sub-mode levels for all other router interfaces. For instance let configure FastEthernet 0/0 with an IP address:
By following above commands, you will switch from EXEC mode to global configuration mode and then to interface mode (config-if) or sub-mode. In the end, notice the exit command a single exit command steps down one mode, from interface to global configuration mode.
Line Console Configuration Mode
To make changes in router serial connection, you have to switch to sub-mode named Line Console Configuration mode. In this mode you can define or modify router’s serial connections for instance:
The above commands instruct the router, not to disconnect console session with EXEC time-out command until the user prompt for it. In the above command the mode is changed with ‘Ctrl Z’, just like the end command which returns to privilege EXEC prompt.
Once you have defined changes in the configurations, the next step is to verify whether the changes are implemented or not. In order to see changes, you have to use Show tool along with the desired interface. To see the commands below to check FastEthernet 0/0 running configurations:
Save Running Config
The most important thing while performing any changes in the configurations is to save them. The method to save changes is to copy running configurations in to the startup configuration.
These are the basics to configure Cisco router but in order to become expert in routers one should look-in further. Computer network is almost everywhere especially at enterprise level, every enterprise hire network administrator to maintain and manage their entire network but they prefer to choose certified professionals. CompTIA is offering Network+ certification for people who are willing to work as network administrators. Network+ certification addresses are the core aspects of computer networking and provide candidates skills to handle technical network issues at enterprise level. But to become CompTIA Network+ certified professional, you have to pass N10-005 exam. This exam is compiled to examine candidate’s skills in the context of networking.