1. A network design customer has a goal of 99.80 percent uptime. How much downtime will be permitted in hours per week? How much downtime will be permitted in minutes per day and seconds per hour? Which values are acceptable in which circumstances?
Ans: To compute the uptime/downtime is to take in concern merely the number of minutes before now passed for up-to-date month and existing year which is possibly what we need to find. A typical MTBF goal for a network that's extremely relied upon is 4000 hours. In different words, the network mustn't fail additional typically than once each 4000 hours or 166.67 days. A usual MTTR aim is one hour. In another sense the network failure ought to be fastened among one hour. I calculated downtime ratio by dividing occupied time into quantity of downtime. The summation of that number would be the ratio of downtime. Downtime for 99.8 percentile would be: Availability = MTBF / (MTBF + MTTR)
SLA level of 99.8 % uptime/availability gives following periods of potential downtime/unavailability: * Daily: 2m 52.8s * Weekly: 20m 9.6s * Monthly: 1h 27m 39.5s

2. Assume you are in New York City in the United States and you are downloading a 100-KB web page from a server in Cape Town, South Africa. Assume that the bandwidth between the two cities is 1 Gbps. Which type of delay will be more significant, propagation delay or transmission delay? Defend your answer.
Ans: Delay is pertinent for every data transmission expertise but particularly aimed at satellite links as well as elongated terrestrial cables. Satellites orbiting our planet at height of almost 36,000 km. This extensive remoteness hints to a propagation delay of almost 270 ms for a worldwide satellite hop. When it comes to the network of elongated terrestrial cables propagation delay is about 1 ms for every 200 kilometers (120 miles). So If I’m in NY City in the USA and server resides in Cape Town SA. This type of delay would be ideal for the scenario. Some might argue that a serialization delay can also be idyllic as the time to put digital data onto a transmission line, which depends on the data volume and the speed of the line. For example, to transmit a 1024-byte packet on a 1.544-Mbps T1 line takes about 5 ms. But in view of a user and a network designer first scenario is ideal as it deals with elongated terrestrial cables propagation network.

3. Can a network have too much redundancy? If so, what is the problem with having too much redundancy?
Ans: Basically the replication of devices, services or links thus if a failure takes place the terminated devices, services or networks can achieve the task of those that failed. Suppose I have 2 sites, every handling one hundred twenty five users, every website can have 2 servers. Every server is capable of well handling the load from eighty four users 2/3rd the quantity of users at the web which means every site is capable of well handling 168 users.

So, if one server at one website were to fail, the opposite server would be ready to handle the majority of the load, whereas light-weight users would be ready to be touched over to the opposite website. If each servers at one website were to fail, however association to the opposite website was still doable, the opposite website would be ready to handle the majority of the load.

However, once I take a step back, it all looks somewhat over-complicated and uncalled-for. Four servers per website would technically be higher than this setup, and eight servers higher than that, however at the top of the day, the last word goal of building in tolerance for hardware failure is achieved by simply having one server at every website.

4. What investigation will you do with regard to the physical infrastructure of the orchards, the orchard shacks, and the cold storage buildings?

Ans:

When it involves the physical infrastructure what i will be able to investigate within the existing network, is that the communication between the orchards, the orchards shacks and also the cold storage.
As a network designer, I'd implement a network which will, if not totally, eradicate work therefore having an info that any of the licensed users will deem well as edit in keeping with what rights they need been given by the systems admin.
Assuming the supervisor can simply do a straightforward telephone presumptuous we have a tendency to functioning on affordability, the fruits can reach the bay of the warehouse wherever they're loaded to a transporter wherever they're cleansed because the quality professional team types out what to be hold on in warehouse i.e. choose the great fruits. Once they withstand the check, they're packed into a box that incorporates a barcode therefore its scanned before storing it within the warehouse. Here I actually have introduced a barcode scanner which is able to continuously update an info. Since we've access to the backend of the company’s web site , once the products area unit verified and scanned, the transfer is finished real time to the web site therefore the purchasers will be able to order the fruits similarly as product from confectionery if they don’t need them as gift basket product.
Making Associate in nursing assumption that the sharks are solely one hundred meters apart and located out of the orchards, I’d counsel that since we are going to strictly be having phone communications from the Orchards to the warehouse, we will move the stand alone computers to the warehouse and network them. for every warehouse assumptive they're like three hundred meters apart, we will have them connect with the packaging department also because the main office- housing the promoting and sales division also as accounts and alternative managers – through microwave links therefore they\'re mounted at the top and directed to a line of web site to the packaging building and main building.
For each and each building you may run UTP Cables as they\'re easier and cheaper to implement. Reasons why I’d not counsel we have a tendency to use fiber is that we are going to get to tamper with the tarmacked road within the land.

5. Make a list of business goals for Harriet’s Fruit and Chocolate Company. What are some constraints that will affect these goals?
Ans:

i File sharing, access and transfer ii Communication through email or chats iii Database access and change iv Security –e.g police investigation and security camera videos

Some constraints which will have an effect on these goals include:
As a network designer, I do know the importance of redundancy because it can perpetually keep their e-commerce application perpetually obtainable however the resources may be restricted so expected to figure with the company’s budget.
When we establish a network, they\'ll got to recruit associate degree IT support team that ought to maintain the graceful running of the network. These square measure extra prices of hiring, coaching additionally as adding a lot of folks within the payroll.
Introduction of police investigation cameras/video. This could arise attributable to the introduction of police investigation cameras which could build the staff desire they\'re perpetually being monitored so poignant at time production
Does your network style have to be compelled to work into associate degree overall design supported strategic planning? If it doesn’t –as sensible and excellent because it is- it\'ll be rejected. thus what will happen here is either you\'re employed mistreatment their policies or senior management conform to what\'s being offered and build versatile their policies that currently means that modification of structure strategic set up.

6. Make a list of technical goals for Harriet’s Fruit and Chocolate Company. What tradeoffs might you need to make to meet these goals?
a. Scalability
b. Availability
c. Affordability
d. Network Performance
e. Security

Tradeoffs that ought to create during this case are between accessibility, affordability and security.
For associate degree e-commerce to be without delay offered, it has to be during a powerful internet server wherever millions and millions will access it at same time while not fail. For this to happen we\'d like to get a strong server or we tend to entrust it to a 3rd party –like cloud computing, even as amazon will. This may be positively raise the prices (affordability) as additionally the third party will charge you.
Another exchange is between security and affordability: For a high security infrastructure, lots of cash has got to be offered.