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VLAN trunking - how to ping PC4 from PC1?

You have not created the VLANs on Switch 3. You must create the VLAN before you can assign ports to it. On Switch 3: Vlan 10 name myvlan exit
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How can i create this topology in cisco packet tracer?

Depending on context/intention, that bus/pipe pictogram represents either an Ethernet layer-1 segment (classically) or a switched layer-2 segment (more modern variant). A layer-1 segment is either ...
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show ip ospf neighbor unexpected results On packet Tracer

You have three routers. They each have two neighbors. What you see are not the interfaces on router X, they are the neighbors of router X. If you want to see the OSPF interfaces on router X, type ...
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How to configure a router as a dhcp server for vlans throught a Layer 3 switch?

Simply configure a DCHP relay on the SVIs with the ip helper-address <dhcp server address> command. Alternatively, you can configure the DHCP server on the layer-3 switch. The built-in DHCP ...
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