$(4)($a$)$ A common data center management requirement is that "all external Web traffic must flow via the organization Web Proxy" However, that requirement is easier stated than implemented. Discuss the various problems and issues, possible solutions and limitations that constitutes "Web Traffic" and how it may be monitored, given the large range of ports and various protocols used by Web browsers and Servers.

$($b$)$ Explain the strengths and weaknesses of each of the following firewall deployment scenarios in defending servers, desktop machines and laptops against network threats

I. A firewall at the network perimeter.

II$.$ Firewalls on every host machine.

III. A network perimeter firewall and firewalls on every end host machine.