6. What are differences between the grid computing and cloud computing? Give three advantages and three disadvantages of using a cloud as opposed to using a conventional architecture. 7. Define the Hemming distance between the two nodes of an n-cube. Prove by contradiction that the Hemming distance of two adjacent nodes in an n-cube is one. 8. Explain the differences between a lost message and an orphan message. Why an orphan message is more severe than a lost message? 9. Multiple-path routing in a hypercube is based on the property if two nodes u and w are separated by k-Hamilton-distance in an n-cube, there are n node-disjoint paths between the source and destination; out of these n paths, k have a length of k and remaining n-k have a length of k+2. Prove this by examples for all permutations of paths, or otherwise. 10. Give salient features of mutual exclusion algorithm as given by (i) Lamport and (ii) Ricart and Agrawala. Differentiate between these two algorithms