digest

Corrections appreciated. Type 0 : No authentication.  This is the default type. R0(config-if)#ip ospf authentication null ----- R0(config-router)#area 1 virtual-link 2.2.2.2 authentication null  Type 1 : Clear text authentication ----- R0(config-if)#ip ospf authentication - or - R0(config-router)#area 1 authentication R0(config-if)