If you have access to the Cisco switch and know the IP address of the laptop, you can identify the...
# Author: Kerry Cordero # Version: 1.0.0 # Description: This script searches a text file "dr-dns.txt" for FQDNs, checks the...
whois cordero.me | grep -i 'expiry' Registry Expiry Date: 2027-07-17T21:24:32Z ...
Finding Spanning Tree Protocol (STP) topology changes in a network is not always straightforward. However, it is critical to identify...
Are you getting an error message that says, “Packet needs to be fragmented but DF set” or “Frag needed and...
Get-ADDomainController -Filter * | Select-Object Name, IPv4Address, Site, OperatingSystem ...
The commands below are helpful when troubleshooting and could be beneficial when designing for scalability. They can easily be scripted...
Knowing which devices are sending BPDU packets on the network when troubleshooting spanning tree issues can be helpful. This allows...
HOW TLS WORKS TLS version negotiation is typically performed as part of the SSL/TLS handshake process. When a client initiates...
curl -Is https://{SITE}.com | head -1 HTTP/2 200 curl -Is https://{SITE}.com/login.asp | head -1 HTTP/2 404 curl -Is http://{SITE}.com |...