Guides
Network know-how & buying advice
Comparisons, EOL/lifecycle, compatibility and authenticity — verified by the netzspec editorial team.
ComparisonLifecycleHow-toAuthenticity
Comparison
Cisco Catalyst 9200 vs 9300: which switch should you choose?
The 9200 and 9300 look similar but target different jobs. A practical comparison of stacking, uplinks, ASIC, and when each makes sense.
2026-08-10 · 3 min read
LifecycleCisco End-of-Life (EoL/EoS): what the dates mean and what to do
End-of-Sale, End-of-Support, last-day-of-support — what each Cisco lifecycle milestone means, and how to plan a migration without surprises.
2026-08-10 · 3 min read
How-toWhich SFP / transceiver fits which Cisco switch?
The uplink type decides everything: 1G vs 10G vs 25G ports take different modules. How to read a switch's uplink and pick the right optic.
2026-08-10 · 3 min read
AuthenticityVerify Cisco authenticity: genuine, refurbished or fake?
Tell in minutes whether a Cisco switch or transceiver is genuine and brand-new — serial check, SUDI certificate and physical security features.
2026-08-10 · 3 min read