Two RJ11 Sockets and Ethernet
The question at hand is about two RJ11 sockets beside a fiber modem and two RJ11 sockets in a room upstairs, and whether they can be considered Ethernet connections. To answer this, we first need to understand that Ethernet uses RJ-45 connectors, which have 8 contacts.
RJ-11 vs RJ-45
RJ-11 connectors, on the other hand, have only 6 contacts. While it is possible to use an RJ-11 cable for voice data, it is not suitable for Ethernet connections. This is because Ethernet requires a minimum of 4 pairs of wires (8 contacts) for data transmission, which are not available in an RJ-11 connector.
Ethernet Connections
In a typical Ethernet setup, you would have an RJ-45 connector on both ends of the cable. One end is usually connected to a computer or router, while the other end is connected to a wall jack or switch. If you have RJ-11 sockets, it's unlikely that they are Ethernet connections unless they are part of a VoIP (Voice over Internet Protocol) system, which uses a different type of RJ-11 connector than the one used for traditional telephone lines.
VoIP Connections
VoIP connections use RJ-11 connectors, but they have a different wiring scheme than traditional telephone lines. VoIP connections require 4 wires (2 pairs), while traditional telephone lines require 6 wires (3 pairs). If the RJ-11 sockets in question are part of a VoIP system, they would not be Ethernet connections.