All_india_services: Under Article 312, the creation of All India Services (IAS, IPS, IFoS) serves as a bridge. While these officers serve the States, they are recruited and trained by the Centre, ensuring a unified administrative standard and providing the Centre with a mechanism to maintain national standards in state administration.
Delegation_of_functions: Article 258 empowers the President to entrust Union executive functions to a State government (with consent), while Article 258A allows a State Governor to entrust State functions to the Union (with Union consent). This provides flexibility in administration during exigencies.
Compliance_and_directions: Article 256 mandates that the executive power of every State shall be exercised to ensure compliance with the laws made by Parliament. Article 257 allows the Union to issue directions to States to ensure that the executive power of the State does not impede the Union's executive power, particularly regarding means of communication of national importance.