Question 1

can you plug this directly into your modem and then connect (wired) to router and pc etc?

Accepted Answer

Odd that both answers managed to give a completely wrong answer (or, rather, an answer that ignores the reality of the situation).

Yes, you can do that, in the sense that the switch doesn't have a dedicated input, so you can connect an Ethernet cable from your modem's output to a port on the switch, then another cable from another port on the switch to the input on the router, then a third cable from the router's output to a third port on the switch, and it should function the same as if you connected the router's input directly to the modem's output, assuming you don't actually plug anything else into it.

However, and this is where the other 2 somehow managed to get the answer completely wrong, neither the switch, nor a modem that isn't also a router, is going to function as a DHCP server. As far as consumer devices go, that will require a router. So the above, which is a total waste of 2 of the 5 ports (as well as requiring an otherwise unnecessary cable), is the only sense in which the answer to your question is "yes".

In every other sense, including, presumably, the way you actually meant it, the answer is "no", because something needs to act as a DHCP server for all of the devices connected to the switch. And, in your case, that thing is going to be a router.

Put another way, your modem, if not acting as a router, is capable of assigning 1, and only 1, IP address. That's why a modem that's not acting as a router has 1, and only 1, active Ethernet port. A router functions as a DHCP server, which means that it's capable of assigning IP addresses to other devices that connect to it.

Put even more simply, only 1 device can get to the Internet via a modem that isn't functioning as a router. Multiple devices can get to the Internet via a router. Therefore, logic dictates that you make the router the 1 device that can access the Internet via the modem and then connect everything else to the Internet through that. A switch like this isn't going to remove that limitation.  So the router needs to be the only thing connected to the modem's output, so it unquestionably receives the single opportunity to access the Internet. Then a switch like this can be used to connect other devices to the router's output, since, unlike the modem, it's capable of granting multiple devices connected to it access to the Internet.

Question 2

can this be used to boost an ethernet sinal over 300ft of cable

Accepted Answer

All switches act as repeaters or "boosters" to utilize your term.
Cat-5 is limited to 100 meters which is about 330' .
In the past I have placed switches at about 200' distance in large factory warehouses to run long distances.  They recompile the wave length as attenuation starts around the 300' mark.

Question 3

What does the v s switchmean

Accepted Answer

That is the "vlan" switch. It isn't a true vlan capability, but it blocks broadcast packets, so you can have (for example...) a DHCP server on the LAN side that doesnt interfere with a DHCP server on the upstream port.

Most users will probably want to leave it on the "S" side unless you have a very good reason not to.

Question 4

Is it rack mountable? The description says yes, many but not all people say no

Accepted Answer

Our switch could mount on the rack，wall or place on the table. The package contains mount brackets.

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Aumox16-Port Gigabit Network Switch, 8 Port POE 120W, Unmanaged Ethernet Splitter, Traffic Optimization, Metal Casing with Fanless Silent Design, Plug and Play, 19-inch Rackmount(SG516P)

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