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Refer to the exhibit. A network problem needs to be solved in company Z; however the only documentation left is this network diagram. Which type of Internet connection might company Z have?
Dedicated T1 line
The diagram has a single connection to its ISP. A CSU/DSU can be seen, which is used to connect a DTE such as a router to a digital circuit. Dedicated T1 lines and Frame Relay use CSU/DSU to connect to the ISP. Wireless, ADSL and Cable dont use CSU/DSU, they act like one. For more information refer to: http://en.wikipedia.org/wiki/CSU/DSU
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