A router is a data communication apparatus, data communication is actually the core routing and switching. Play router is routing, the switch is to play the exchange, in fact, two devices are interlinked, so the router will play the play will be a switch.
Router with lots of interface, the interface will connect on this line now, all the fiber. LC mostly a single mode optical fiber, a variety of speed of light modules, mainly GE, 10G, 100G, and 400G, 50G and 25G have non-mainstream. After receiving the data router is in charge of them turn out from the right exit, simply is not good? Of course not so simple, or I have no food to eat.
Internet router family is the smallest small box, enter the access network router, usually five Ethernet ports plus WiFi capabilities. I do this little box out for seven years, although it has also IP devices, but functional too, relied eat food may not be very good, and this is the reason why I will start to get large-scale router. I speak behind a router is a router with a big refrigerator, the kind of value in making it, because even a small dynamic routing protocol routers do not have, at best, a default gateway, even if there are RIP, no one used, incidentally RIP is now obsolete.
My industry is the lack of guiding people, so I take a lot of detours, and this is the reason why I wrote "Datacom years", let me get through the number of network engineers take some less network. Before I H into the company, still mad science ATM, DLCI, wasted a golden youth, not knowing that these things are out of date, I turn to the reasoning to go? Take college entrance examination, the information asymmetry, rural baby doll cities on the test do not win, not that they are not smart enough.
Small box routers are usually 192.168.1.1 address to log in, there are GUI, Graphical User Interface, in fact, do not rely on this meal, many people will not go in to see the board. Large routers generally placed convergence layer or the core layer network divided into three layers, there is a access layer.
Large routers generally through the management interface management, management by management interface before, requires the console port via a serial cable connection, such as landing into SecureCRT, H's routers are generally 9600 baud, to the management port GE0 / 0/0 or Ethernet0 / 0/0 to set the IP address. Routers are generally rely on bread with CLI, rather than network management, network management business of high efficiency, but even more directly and quickly CLI.
Enable telnet server, set up under the aaa user view, and then enable the agreement under vty view, specify the aaa way, of course, you can also use ssh, security points.
In the router interface file to be several cd / dir, mkdir, mainly taking the log files and configuration and operating software package. We upgrade the software to the router and change the configuration files are used ftp, shelves in his computer a ftp server, security may want to use sftp.
Successful landing to the router, you can use CLI operations, the router can be said into the door.