olemus
võrgu kihtarhitektuuri komponent
=
component of layered network architecture

näiteid
https://www.wwt.com/article/comparing-two-tier-three-tier-data-center-networks

https://hal.inria.fr/inria-00435508/PDF/A_Three_Tiered_Wireless_Hospital_Sensor_Network.pdf

https://en.wikipedia.org/wiki/Tier_1_network

https://en.wikipedia.org/wiki/Tier_2_network