I would like to buy a 1000 Mb network switch and connect it with 100 Mb router which have DHCP server.
So I would like to know it computers connected on the 1Gb switch would be able to connect @ 1Gb network speed? I an not sure since DHCP server is 100 Mb, and it initialize the connection ... Would help if I would set manually IPs or this makes no difference?
DHCP doesn't determine the speed of the connection, it simply assigns an IP address and a few other configuration details, such as router, DNS servers etc.
The network speed is negotiated between the NIC and the switch independantly of DHCP.