Switch or router?

Question

network hardware

Hello.
Please tell me how to connect.
The Internet comes via a telephone cable, there is a ZyXEl modem, and then the Internet goes to devices from two ports.
Task.
Hang 3 ip-cameras + 1 video recorder + put it on the Internet.
It turns out that to combine cameras with a registrar, you need 4 ports + 1 port to connect to the Internet of the registrar, in general, you need to fit a 5-port router or switch in order to plug cameras with a registrar into it and itself into ZyXEL.
Actually what to take for this purpose, a router or a switch???
It seems that routing is not particularly necessary, but it is necessary to forward the ports for the registrar, but as I understand it, they must be registered on the input Zyxele.
Here also I think, whether to cope with a switch or a router to take.

Answer 1

switch 100%