It is essential to comply with the specifications of the reader. -2- The description Sousse for the backbone is not complete and does not seem to qualify architecture with VLANs. In the revised edition that the writer gave he didnt mention vlans -4- The ‘review of suitable communications links’ is incomplete and technically acceptable. We compare different between the technologies and the proposed solution may not be the best. We are talking about more than 30 km! -5- The ‘critical analysis and detailed evaluation of the requirements with regard to the distribution and access layers’ does not exist at all. -6- The ‘selection of suitable models of switches and make sure they meet the requirements of each layer of a hierarchical network’ is incomplete. -7- The ‘network design of that supports the new distance-learning program and improves the performance of the existing network’ does not exist at all. -8- The ‘identification of suitable network components together with a set of costings’ does not exist at all.