Category: Cisco
CCNA Security (640-553)
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I passed. Even though I'm working toward my CCIE Routing and Switching, I knew this wouldn't be a chump test. There's only so much I can say about it under the NDA, but here's my results and the steps leading up to it.
Cisco In-band Password Recovery Using TFTP & SNMP
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We inherited a legacy network in a remote location, configured with a dead AAA server, and local user accounts that no one had the password to. I knew the "enable secret" and VTY password, but the local accounts were preventing me from ever getting to use them. What I did have at my disposal, was knowledge of the read/write SNMP string and access to a server listed in the ACL for it.
Basic Cisco Troubleshooting Cheatsheet
Remote Upgrades Using X-Modem Transfers Over TCP/IP
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We've got some devices that you can perform a system image upgrade via X-modem transfer over the serial port. Various reasons make this desirable in our environment, but there's one drawback... who wants to be standing in front of a load-balancer in an early-morning maintenance window with a serial cable hooked up to their laptop? Thanks to the Cisco-based console solution, there's another way. Following these simple steps, you can kick off an X-modem transfer remotely.
How "Reverse Telnet" Works
I never cared much for the term "reverse telnet." When you get right down to it, "IP-to-Async Redirection" or "Serial Pass-through" would be far more accurate, but they all amount to the same thing for the same reason. Remote console access.

12/17/08 12:26:35 am, 