Assignment Problem: Data Communications
Problem 1:
(a) A magazine publisher based in Nairobi has a branch in Kisumu, and one in Mombasa. The company has kept in touch by telephone and courier service.
Each office is networked. The networks were implemented five years ago and each has a 10 Base 5 Ethernet network.
Lately, the company has been developing projects that involve teams consisting of members from more than one office. Each office has resources that others do not; the current projects require all of these resources.
The networks have frequent cable problems, and each time they have one, the entire network goes down until the problem is resolved.
The management team would like a networking solution which would offer easier troubleshooting, less downtime, and WAN communications between sites. They would like the WAN connections to support 256 Kbps of data and several telephone conversations. The combination of long distance calls and courier service should be eliminated by the WAN. Management would like the WAN to be able to continue operation even if one of the WAN links fails.
i) Identify at least two items at every site that needs upgrading.
ii) What type of WAN connection (link) might you use to connect the three sites to each other?
iii) How many WAN connections will it take to connect the three sites? Show the links in a diagram?
iv) What type of device could be used to connect the multiple signals from both voice and data and put them on the same WAN link?
v) What type of connectivity device should be used to connect the LAN to the multiple paths in the WAN created? What IP addresses should be used for the LANs/ WANs?
vi) Discuss the media that is suitable for individual the branch offices, stating the merits and demerits of each media.
Problem 2:
(a) Discuss four internetworking challenges.
(b) Describe how Virtual Private Networks are implemented and secured against attacks.
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