Installing the Software
Each router comes with JUNOS software installed on it. When the router is powered on, all software starts automatically. The software is then configured, and the router is ready to participate in the network.
The software is installed on the router's flash drive and hard drive. A copy of the software also is provided on a removable PC card (or, on some M40 routers, an LS-120 floppy disk), which can be inserted into the router's card slot (for the LS-120, the floppy drive). Normally, when the router is powered on, it runs the copy of the software that is installed on the flash drive.
The router software can be upgraded as new features are added or software problems are fixed. Software can be upgraded by downloading images ...
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