. It is said that frame relay services and dedicated-circuit services are somewhat similar from the perspective of the network designer. Why?

 EXERCISES 

A. Find out the data rates and costs of T-carrier services in your area. 

B. Find out the data rates and costs of packet-switched and dedicated-circuit services in your area.

 C. Investigate the WAN of a company in your area. Draw a network map.

 D. Using Figure 9-10: a. Suppose that the example used a layer 2 VPN protocol called L2TP. Draw the messages and the packets they would contain. b. Suppose that the Web server was an email server. 

Draw the messages from the email server to the employee’s computer.

 Show what packets would be in the message. c. Suppose the office connects to its ISP using metro Ethernet. 

What packets would be in the message from the office router to the ISP? 

d. Suppose the employee connects to the ISP using a layer 2 protocol called XYZ.

 What packets would be in the message from the employee’s router to the ISP?