Major tasks:

A$.$ Analyze the above network design. Choose the right system devices for project implementation. Update the network map based on your ports chosen.

B$.$ Create two new VLANs $(10$ and $20)$ on Switches, set two trunk links between the switches.

C$.$ Set up inter$-$VLAN routing by SwitchA and HQ so that the three PCs in three different VLANs can PING each other. $($Hint: subinterfaces creation on HQ Fa$0/1)$

D$.$ Apply switch port security to harden PC$1/2/3$ switch access.

E$.$ Apply OSPF with two areas as shown in the network map. Make HQ as DR and GW as BDR in the Ethernet segment. Make Area $10$ as totally stubby area, and verify the Branch's routing table to see if there is only one default route as OSPF route entry. Test PC$4$ to any other PCs IP connectivity