True,
In Linked allocation scheme, all the blocks allocated to a file is linked with each other through pointer. 1st node will have the pointer to 2nd block, 2nd block will have the pointer to 3rd block & so on.
The purpose of Linked allocation is to prevent external fragmentation but it is possible that the last block will not have the sufficient data to get fully filled. If the last block is vacant, that space cannot be allocated to other file & as a result, this vacant space is internal fragmentation.