Cisco Switching Question

Hi there,

I have
SW-3750

Internet — SW —SW1 — RTR — FIBER — RTR — SW2

rtr are managed by isp.

my question is for SW1 and SW2 only

On SW1
I created a tunk port on SW1 port 1– to connect to the eth of rtr.

Created vlan 4 for all the 23 access ports.

On SW2

I created a tunk port on SW2 port 1– to connect to the eth of rtr.

Created vlan 4 for all the 23 access ports.

Now question do i have to creat an
int vlan 4
ip 1.1.1.1 on SW1

and
int vlan 4
ip 1.1.1.2 on SW2

what will be the default gw of pc on SW2.

AND CAN I PING from pc on sw2 to pc on sw 1.

Setting a testing scenario.