"Dynamic routing protocols such as OSPF are a key technology in the reliable operation of networks in most large organisations. To ensure correct information is communicated, installations of OSPF are usually configured to include a hash value in OSPF packets to allow their contents to be validated by receivers.

Consider a scenario where an attacker gains limited control over a router which interconnects three or more networks. The access gained by the attacker only allows them to activate or deactivate $($turn on or off$)$ any of the network interfaces on that router.

i$.$ Describe how OSPF would react to the attacker deactivating one of the network interfaces on the router.

ii$.$ Discuss XK$07$ the possible impacts on the network if the attacker were to repeatedly deactivate and reactivate one of the network interfaces on the router."