QUESTION 2 (15 MARKS)

1. A network designer wishes to provide a customer with the rationale for moving the enterprise from a flat network design to a hierarchical network design. Which of the following two features of the hierarchical network design would they best use to convince the customer that it is a better choice? Explain your answer! [5 Marks]

• reduced cost for equipment and user training

• lower bandwidth requirements

• less required equipment to provide the same performance levels

• simpler deployment for additional switch equipment

• easier to provide redundant links to ensure higher availability

2. The hierarchical network design allows for specialized functionality at each layer (i) Discuss two specialized and distinct functionalities of the distribution layer (ii) consequently explain the reason for using Layer 3 devices instead of Layer 2 switches at the distribution layer to achieve each of the functions. [5 Marks]

With the help of an appropriate diagram, describe any one technique/protocol that is commonly used at the distribution layer to ensure that it meets the following network design requirements/goals (i) availability (ii) security (iii) manageability(i.e.troubleshooting, problem isolation, fault containment with little or no impact to the rest of the network) Explain!