Nugget Post: CCDP Arch Study Notes

My CCDP Arch (642-874) study notes, feel free to use:   https://docs.google.com/document/d/1Nna54x8yQqB4V6_cam3MgTdNhLTmwWyHbsAShZAA5ss/edit?usp=sharing  

Nugget Post : resetting a cisco nexus switch

Cisco nexus factory reset procedure:   1. Clear configuration by running: write erase [boot | debug] Syntax description: boot(Optional) Erases only the boot variable and mgmt0 interface configuration. debug(Optional) Erases only the debug configuration. Example: switch(config-if)# write erase Warning: This command will erase the startup-configuration. Do you wish to proceed anyway? (y/n) [n] y 2. … Continue reading Nugget Post : resetting a cisco nexus switch

Lessons Learned: Overriding routing in Cisco ASA

While at a client this week, I ran across a fundamental change in post 8.3 cisco ASA routing logic which blindsided me for a while. The scenario was that after changing some VPN tunnel endpoints and hence changing subnet locations, we started seeing errors in syslog along the lines of TCP session torn down, "no … Continue reading Lessons Learned: Overriding routing in Cisco ASA

Lessons Learned: Cisco Catalyst Q-in-Q

Today I had the chance to work on a scenario where cisco Q-in-Q was needed. Basically, Q-in-Q is a method wherein a vlan (normally that of a customer) is left intact, and encapsulated within another vlan (normally that of a provider). So it's vlan-within-a-vlan. There are plenty of guides on the internet that explain it, … Continue reading Lessons Learned: Cisco Catalyst Q-in-Q

Cisco WLC 2500 series – Lessons Learned

Assigning a local DHCP server 1. Define a new Internal DHCP Scope (Controller > Internal DHCP Server > DHCP Scope). 2. Ensure that the newly defined DHCP Scope is in the same IP range as that defined on the Wireless Dynamic interface 3. Under the Dynamic Interface settings (Controller > Interfaces > [select the dynamic … Continue reading Cisco WLC 2500 series – Lessons Learned

Nugget Post: Troubleshooting CISCO Anyconnect “The VPN client agent SSL engine encountered an error. Please restart your computer or device, then try again.”

I encountered a very frustrating problem when using CISCO's Anyconnect VPN client on linux (ubuntu to be specific). Every now and then the client would throw an error right after a successful login: The VPN client agent SSL engine encountered an error.  Please restart your computer or device, then try again.  If the issue persists, … Continue reading Nugget Post: Troubleshooting CISCO Anyconnect “The VPN client agent SSL engine encountered an error. Please restart your computer or device, then try again.”

Nugget Post : CCNP Security 642-627

Finally finished the CCNP Security certification. You can find my mind-map for CCNP security 642-627 / (Deploying Cisco IPS Solutions) here (click here) You may download the image (File > Download, or simply press "ctrl + s"). In case the image refuses to open or is marked as corrupted, change the extension from .jpg to .png … Continue reading Nugget Post : CCNP Security 642-627