Learning IOS and JUNOS

昨天應Cisco邀請協助到CHT去介紹目前Cisco認證所有Track的現況及相關課程。我想這份資料對許多不了解Cisco認證的人都或多或少有所幫助，因此我把這份文件放到 Scribd 供各位下載參閱，如有任何不清楚或是其他更好的建議也歡迎給我批評及指教。 Cisco專業認證介紹 Publish at Scribd or explore others: Business Presentations & Slid ccna CCNP

Thanks to CCIE#20586 who re-organized the terminal server menu configuration for my BSCI course. It is modified from ICND1 configuration file and it is good for students who like to change console connection without disconnect the previous one. version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname BSCI-CS ! boot-start-marker boot-end-marker ! no logging console enable secret cisco ! no aaa new-model ! resource policy ! ip tcp synwait-time 5 ! ! ip cef ! ! no ip domain lookup ip host P3R4 2081 1.1.1.1 ip host P1R1 2066 1.1.1.1 ip host P1R2 2067 1.1.1.1 ip host P1R3 2068 1.1.1.1 ip host P1R4 2069 1.1.1.1 ip host P2R1 2070 1.1.1.1 ip host P2R2 2071 1.1.1.1 ip host P2R3 2072 1.1.1.1 ip host P2R4 2073 1.1.1.1 ip host P3R1 2078 1.1.1.1 ip host P3R2 2079 1.1.1.1 ip host P3R3 2080 1.1.1.1 ip host FRSW 2074 1.1.1.1 ip host BBR1 2075 1.1.1.1 ip host BBR2 2076 1.1.1.1 ip host Pagen 2077 1.1.1.1 ip host SW 2078 1.1.1.1 ! ...

學習過Cisco IOS的人都知道其實在User Mode(Router>)之下沒有什麼指令可以使用，所以通常我們也不會在User Mode停留就直接打enable進入Privilege Mode。不過我看到一篇文章分享一個bug可以讓各位在真正緊急狀況時不用進入Privilege Mode而重啟Router。 By Brian Dennis, CCIE #2210 I’m over in London this week for a CCIE Voice Bootcamp and a support engineer IMs me asking a question. He needed to remotely reload a backbone router for a new rack but for some reason the standard enable password we use for the backbone routers wasn’t working. I asked him if he could just VPN in and reload it using the power controller. He told me he was telneted into the rack using his iPhone and wanted to just do it via telnet as opposed to opening a VPN connection. For a moment I thought to myself he was just out of luck but I then remembered the old regular expression bug that would reload the router (i.e. “show ip bgp regexp ([0-9]*)(_\1)+”, “show version include ([0-9]*)(_\1)+”, etc). He types it in, the router crashes and all is good. This also reminded me that I need to update the initial c...