During the design of most networks in the real world, using more than one type o

Question

During the design of most networks in the real world, using more than one type of networking medium is common. The usual reasons for needing more than one type of medium can include: § Distance that is greater than the maximum segment length for the type of medium in use. § A connection that must pass through a high-interference environment. § Certain parts of an internetwork might have to carry more traffic than other parts. Using this information (and your text), suggest solutions that involve at least two types, if possible, of networking media to address the following problems?

A. Old Tech Corp. is planning a new network. Engineers in the design shop must have connections to accountants and salesmen in the front office, but all routes between the two areas must go through the shop floor, where welders and metal-stamping equipment create large amounts of EMI and RFI. Given that both the design shop and the front office use 10BaseT how might you interconnect these two areas? What medium guarantees immunity from interference? [4]

B. After the front-office network at OldTech Corp is set up, an accountant realizes that if the loading dock connected to the network, dock workers could log incoming and outgoing shipments and keep the inventory more current. Even through the loading dock is nowhere near the shop floor, the dock is 335 meters from the front office. What kinds of cable will work to make this connection? What kind would you choose and why? [4]

C. Er bilBook Company occupies three floors in a 10-story building, where the elevator shaft provides the only path to all these floors. In addition, users on the 9th and 10th floors must access a collection of servers on the 8th floor. Explain what kind of connections would work in the elevator shaft. If more than one choice is possible, pick the best option and explain the reasons for your choice. Assuming that inter-floor connections might one day need to run at much higher speeds, reevaluate your choice. What is the best type of medium for open-ended bandwidth needs? Explain your answer [

Explanation / Answer

A. The best option is to use fibre optics. Fiber optics are immune to electromagnetic interference(EMI) and radio frequency interference(RFI), because they transmit signals as light instead of current. We can use switches to interconnect the ends of fiber connection to the 10BaseT networks, one to the design shop and the other to front office. As it is optic based, it can easily carry signals from shop floor, where EMI and RFI is huge. Shielded Twisted Pairs (STP) can also minizes interfernce, but are not reccommended, as they no where near to effectiveness when compared with fiber optics.

B. A good choice for question 2 will be 10Base5 Coax cable. It has a length upto 500 meters and it is cheaper too. But the disadvantage is that it is an old technology and susceptible to interferences. The other best choice can be multimode-fiber which has a maximum data rates of upto 10Gbit/sec over a distance of 600 meters. So, you can either choose fiber optics or 10Base5.

C. We can use RISER CAT6 cable or 802.11n Wireless Acess Point inside the elevator shaft. The second part says about the requirement to run at "higher speed", so obiviously 802.11n WAP is out of the answer. The better choices could either be RISER CAT6 cable or Fiber optics (if we are looking for any interfaces in the elevator shaft).

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