Pre-deployment validation of Cisco IOS/IOS-XE configuration — catching missing saves, mismatched ACLs, overlapping subnets, duplicate IPs, missing route-maps, and dangerous commands before they cause outages.
Cisco IOS and IOS-XE configuration syntax, show commands, privilege levels, config mode navigation, wildcard masks, and the most common operational gotchas.
BGP neighbor state analysis, stuck session troubleshooting, AS path inspection, route filtering, and peering issue diagnosis on Cisco IOS/IOS-XE and multi-vendor devices.
Diagnosing network interface errors including CRC errors, input/output drops, runts, giants, duplex mismatches, flapping, and speed negotiation failures on Cisco IOS/IOS-XE devices.
Home network architecture from scratch — gateway placement, switch and AP selection, IP addressing scheme design, DHCP scoping, and common setup mistakes for homelab beginners.
Multi-vendor network device SSH automation using Python Netmiko — connecting, sending commands, parsing output, handling enable mode, error handling, and batch operations across device lists.