Answers without ACL is this correct*********************************************************************************************************************************************Step 1a.BldgeA(config)#intteface fastethernet 0/1BldgeA(config-if)#ip address 10.10.10.238 255.255.255.240BldgeA(config-if)#no shutb.staff PCip 10.10.10.190SN 255.255.255.192DG 10.10.10.129c.verfy with ping command*********************************************************************************************************************************************a. Use the following requirements to configure OSPF on Main, Admin, and BldgAMain(config)#router ospf 5Main(config-router)#network 10.10.10.192 0.0.0.31 area 0Main(config-router)#network 10.10.10.252 0.0.0.3 area 0Main(config-router)#network 10.10.10.248 0.0.0.3 area 0Main(config-router)#do wAdmin(config-router)#router ospf 5Admin(config-router)#network 10.10.10.248 0.0.0.3 area 0Admin(config-router)#network 10.10.10.224 0.0.0.15 area 0Admin(config-router)#network 10.10.10.128 0.0.0.63 area 0Admin(config-router)#do wBldgeA(config-router)#router ospf 5BldgeA(config-router)#network 10.10.10.0 0.0.0.127 area 0BldgeA(config-router)#network 10.10.10.224 0.0.0.15 area 0BldgeA(config-router)#network 10.10.10.252 0.0.0.3 area 0BldgeA(config-router)#do w*********************************************************************************************************************************************b. Configure OSPF authentication on the links between BldgA and Admin, Admin and Main, and Main and BldgAMain(config-router)#router ospf 5Main(config-router)#area 0 authentication message-digestAdmin(config-router)#router ospf 5Admin(config-router)#area 0 authentication message-digestBldgeA(config-router)#router ospf 5BldgeA(config-router)#area 0 authentication message-digest