Question

what is meant by the internal and external frontier of the sultanate ?
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Answer 1

Explanation:

The 'internal' frontier means the hinterland of the garrison town. The 'external' frontier means the area beyond the hinterland of the garrison towns.

or..

Internal' frontiers of the sultanate refer to the 'hinterland' of the garrison towns.

The 'external' frontiers, on the other hand, refer to the areas beyond the hinterland of the garrison towns that included the unconquered territories especially in the southern parts of India.

Answer 2

The ‘internal’ frontier means the hinterland of the garrison town.