In a switch GS108T-200NAS vs GS108T
In the specific case of the GS108T, there are three major versions (so far). If you look at the support area, they are called v1, v2, and v3.
[PDF] ProSafe® 8
The GS108T comes with a comprehensive set of features, such as access control lists (ACL), 802.1x port authentication, enhanced QoS, rate limiting and IGMP ...
Managed switch NETGEAR GS108T v2
All 8 ports are equivalent, NETGEAR GS108T v2 does not have dedicated Uplink ports, stack ports, USB or RJ 11. And in fact, with the declared POE support, the ...
[OpenWrt Wiki] NETGEAR GS108T v3
The GS108T v1 (GS108T-100PES) and v2 (GS108T-200PES) are unsupported; they apparently run eCos and don't have enough flash or RAM to run a modern OpenWrt (v1 ...