I've configered network as you can see in the picture

It consists of

Routers:

Aplha network $3\mathrm{.}0\mathrm{.}0\mathrm{.}0/24,$ has linked server DS$9,$

Delta network $4\mathrm{.}0\mathrm{.}0\mathrm{.}0/24,$ has linked PC Bajor

Gamma network $2\mathrm{.}0\mathrm{.}0\mathrm{.}0/24,$ has linked PC NX $-74205.$

Switch with network $1\mathrm{.}0\mathrm{.}0\mathrm{.}0/24$

Bajor has the following configuration IP address $4\mathrm{.}0\mathrm{.}0\mathrm{.}2,$ subnet mask $255\mathrm{.}255\mathrm{.}255\mathrm{.}0,$ default gateway $4\mathrm{.}0\mathrm{.}0\mathrm{.}1,$ dns server $3\mathrm{.}0\mathrm{.}0\mathrm{.}2$

NX $-74205$ has the following configuration IP address $2\mathrm{.}0\mathrm{.}0\mathrm{.}5,$ subnet mask $255\mathrm{.}255\mathrm{.}255\mathrm{.}0,$ default gateway $2\mathrm{.}0\mathrm{.}0\mathrm{.}1,$ dns server $3\mathrm{.}0\mathrm{.}0\mathrm{.}2$

server DS$9$ has the following configuration IP address $3\mathrm{.}0\mathrm{.}0\mathrm{.}2,$ subnet mask $255\mathrm{.}255\mathrm{.}255\mathrm{.}0,$ default gateway $3\mathrm{.}0\mathrm{.}0\mathrm{.}1,$ dns server.

From what I see in simulation mode, the problem occurs on the routers $-$ PC$\text{'}$s cannot ping each other or reach server.

VLAN$1$ is up for all routers and switch, all interfaces are active to all routers and switch.

Please tell me what could be the problem with confuguration and how to fix it