A popular computer network publication stated at one time that the enterprise firewall was dead. It boldly stated that the exterior firewalls of the organization should be torn down and replaced with host-based firewalls instead. Is this insane, or is it the best new practice in security management?

The flow rate of air through a through a pipe is 0.02 m5/s. a pitot static tube is placed in the flow. the radius of the pitot static tube is 1 mm. assuming the flow to be steady and the air to be at 300k, calculate the difference in total and static pressure if the diameter of the pipe is: (a) d 0.1 m d 0.05 m (c) d 0.01 m