Question

issues of contiguous and non contiguous memory allocation

Answer 1

Contiguous memory Allocation issues is case of fixed partitions are mainly fragmentation inside the core,multi programming but with a fixed degree and in case of variable partitions problems in swapping, fragmentation outside the shell,compaction.

Non-contiguous memory allocation issues is the way to gain several memory blocks according to needs at different points/internal and internal and external fragmentation causes memory wastage which in turn is reduced by non-contiguous memory allocation.