Upon my investigation of various media transmissions that may be used between the labs and universities I have examined the three various cable types and the three wireless types, stating their advantages and disadvantages and if they would be suitable for the universities and labs.
Twisted pair:
Most commonly used for PCs on a Local Area Network, it has advantages of being cheap to install and it is easy to terminate however its disadvantages are that it is limited in distances (100m) but enough distance to connect the computers in the labs. Another disadvantage is that it suffers from interferences. It also has not got a great speed of bandwidth but sufficient enough to connect lab computers. The twisting of the pair is used to reduce interference
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Assuming the labs have 5 computers in each lab and a printer device, I have decided to use a star for the network topology within each lab of university 1. Each computer will have a dedicated point-to-point link to the central hub device in the lab so no direct traffic between devices. Compared to the bus topology, the Star gives better performance.
“It is easy to connect and remove new nodes or devices without effecting the rest of the network” (Sparrow, P, 2016).
Between Labs (University 1):
To connect the three identical laboratories in university 1, I have researched the topologies and have decided to use the Bus topology because it is known to work well in small networks and can be of the easiest topology for connecting computers as it requires less cable length than the STAR topology. The bus topology unlike the STAR, MESH and RING, is a multipoint configuration. It uses one long cable as a backbone to link all of the devices in the network by way of connecting notes to the cable by drop lines and taps.
Within Labs & Between Labs (University
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Benefits:
• If a link fails, only that link is effected
• Ideal for small physical regions i.e. university campus
• Can add or remove workstations from each star network
• Less expensive than mesh as each device only needs one link and I/O port
• Easy to install and configure
Limitations:
• In a tree network, a failure to one cable will isolate the workstation that links to the switch of the STAR, but only that workstation will be down. All other workstations will function normally, except when trying to communicate with the workstation that is down from the tree network.
• If the central system goes down, the entire network that relies on it will suffer in performance or even complete failure.
Question 5)
Interconnecting Devices
There are up to six main categories of interconnecting devices used in a computer network such as
• Repeaters and active hubs
• Passive hubs
• Bridges / two layer switches
• Routers / three layer
In the Network Design Paper I will explain how the University has recently leased a building in Adelphi, Maryland. The measurements of the University is 240 feet long, 95 feet wide and 30 feet tall and broken down to two different floors. This University will be used for education purposes of course, the facility will be made of six instructional labs, seven offices, library, five classrooms, a student lobby and a computer lab. There will be a server room on each floor. The purpose of this paper is to explain the design of the networks in this building. The student accessed computers will be set up on a separate network than the network that they staff will be using.
Component needed will be; five 24 port switches, Cat5e UTP and the workstation computers with the proper NIC devices. This layout would start with the 24 port switch in the center of the network. This switch is connected using a Cat5e UTP medium to the other 5 switches. Each switch is connected to the workstation computers using Cat5e UTP medium. This will create a physical star topology. The logical topology will be based on a 100BaseTX and incorporate the use TCP/IP protocol.
Some of the other individual sections of the departmental network use different standards such as 1000Base F. The two networks are connected by a network bridge. The network bridge is used to inexpensively and easily connect local area network segments (Microsoft, 2010). The reason a network bridge is inexpensive is that there is no configuration required and you don’t have to purchase additional hardware such as routers and other bridges.
In the design, the topology used is a star topology. The computers in every office or classroom are linked to the central device known as the switch. The star topology leads to the expansion of the network without any disruption. This defines the use of a hub, a router or a switch to interconnect various computers together. All the workstations in this topology are connected with a connection of point-to-point to the central device. The data is first passed through the primary device before reaching the planned destination. Hub controls and manages the whole network. The hubs connect several nodes that are present in the star system. The hub acts as the signal booster (Elhakeem, 2010).
The mesh topology provides multiple routes between devices. Not only does this provide alternates for file transmission should there be a failure anywhere along the network, but it makes it easy for additional devices to be connected and will not slow down network traffic. Since networks built using mesh topology can be large one of the main disadvantages is the difficulty involved with installation, configuration as well as the on-going maintenance involved. The expense of cabling is also a disadvantage of mesh topologies as they can take more cabling and more devices than other topologies. (Networking
This created physical connection between PC’s and the network line. Connected data’s are transporting data’s through the network. Cable is a medium through which information usually moves to one network to another network.
In the star arrangement, there's a focal pc or server to that every one of the workstations are specifically joined. Every workstation is by implication associated with each diverse through the focal PC.
Bus – All computers and devices are connected asynchronous to one linear cable known as a trunk or generally known as a backbone. each ends of the trunk should be terminated to prevent the signal from bouncing duplicate the cable. as a result of the network
The current hardware and software components will need to be upgraded at the three locations for this new network. For starters, each location will need to have a Network Interface Card (NIC) implemented. This will allow the workstations or any other
20. Which type of network treats all processors equally, and allows peripheral devices to be shared without going to a separate server?
ii. Most manufacturers are recommending the use of UTP cable for cabling computer networks except for very noisy environments.
The main topologies are Bus (All Workstations are connected to one line), Star (All Workstations are connected to a central hub), Ring (All workstations are connected to fellow workstations left and right of them) and Mesh (All workstations are connected to each other). A lot of topologies are designed to allow more workstations to be added at a later date. But a lot of topologies also have weaknesses, such as the Bus topology and the Ring topology, which would both break down if a node was to fail.
Since University of Maryland University College in Adelphi, Maryland is a growing academic entity in a modernized world, has a need to install a new network designed for both administration and student access to the internet anywhere within the building . A recent expansion that includes a library, office space, computer labs and classrooms will provide this capability and enhance students learning potential. The network must maintain consistent connectivity throughout the whole building and maintain security by segregating its data between the faculty staff and students. In addition, this is an important security requirement; the building’s network will have to operate on
The diagram above shows the high level LAN network design that could be implemented. Inter-office connections could be done using Sate-590553175llite Communication or using a single point ISP provider to do the networking.