Chapter-3 case project

1. Ans: D
It is more appropriate to use fiber-optic cable, since it leaves more room for growth and for future needs for increased bandwidth, than thinnet does. Though Thinnet could span the 400ft distance (121.92 meters), it is expected that if we use thinnet, there will be a high attenuation rate that makes it expensive over a long distance. Thinnet is bulky and has a lower data rate (10 Mbps) compared to the greater capacity of fiber-optic which is up to 1Gbps. Fiber-optic cables, are also smaller in size and lighter in weight. It causes lower attenuation than thinnet and it has immunity to environmental interference and is highly secure due to tap difficulty and lack of signal radiation.
2. Ans:B
The proposed solution to the problem delivers the required result. The network could support speeds up to 100Mbps, by using fiber-optic backbone. Fiber-optic cable could transmit data up to 1Gbps. But then, the TVBCA’a budget (inexpensive) could not support the proposed network solution, because fiber-optic costs expensive. If the company wishes to achieve the speed or rate of 100Mbps and is inexpensive at the same time, it is more practical for them to use Coaxial Thin Ethernet, which could achieve their desired speed and is not as expensive as fiber-optic.
3. Ans:A
The proposed solution, which is using category 5 UTP and hubs to connect all the workstation, delivers the required result of having the network operate at the speed of up to 100 Mbps. Category 5 UTP enables 100 Mbps data rate. It is also inexpensive and is easy to install, so it also delivers the two optional desired result of the company.
4.Ans:B
The proposed solution delivers the required result, and/but only one of the two optional desired results. The implementation of a cellular link from GTE MobilNet for $2,500 a month, plus airtime charges on encryption fees, would mean that the chosen network solution is costly or inexpensive, dropping the “should be cheap as possible” desired result. But then, the encryption fees that they would pay monthly could achieve their goal of security from electronic eavesdropping.
5.Ans:C
Installing a set of 10 Mbps point-to-point, infrared laser wireless bridges for communication between the two buildings of TVBCA, could enable communication between servers of the two LAN’s in every building. But, this proposed network solution, could not guarantee the company, security from electronic eavesdropping. Wireless technology is very prone to hacking, especially if permission to connect to the network is not restricted; and because there is a transformer located nearby the 15 storey building, the proposed network solution, is not resistant to attenuations such as electromagnetic interference.