NTC406 wk 2 Individual
NTC406 wk 2 Individual
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Date Created: 11/14/15
NTC/406 Global Network Architecture and Design Slow Network Analysis week 2 LAN is used to connect more than one computer with each other in a limited area network in offices, schools, and computer laboratory. Common technology is used to establish the LAN Ethernet and Wi-Fi. Client node densities approaching or surpassing those of cellular telephony can be expected because of the continuing market success of wireless LAN’s (WLAN) and integration of devices such as printers, music players, and mobile phones. Because of this usage growth there can be an increase in co-channel interference. The standard approach to alleviate inter- cell interference is careful frequency planning, that prevents neighboring cells from functioning on the same channel, transmission power control, and carrier sense tuning to increase spatial reuse. Distributed channel selection is a dynamic form of these approaches. The technique used in cellular technology can be considered for use in large WLAN systems to optimize the bandwidth. • Increase in number of users - As the number of user that login to the network increases either laptop or mobile the bandwidth is distributed among users the speed of the network slows down. • Increase in the network nodes - Nodes are like a switch or router they slow down the network or system as the number of users to that system increases the bandwidth is distributed between them and slows down the network. • Use of peer-to-peer network - Tasks such as searching for files or streaming audio/video are shared between numerous connected peers. They make part of their resources like disk storage, network bandwidth or processing power available, without the need for centralized coordination by servers, to other network participants. It is also useful for two users to communicate like file transfer, or Skype. • Streaming video - Video requires higher bit rate to transfer from one point to another. Because images require more bit rates, video transmission increases the bandwidth streaming video on devices uses a large amount of bandwidth, which slows down the network. • Introduction of wireless edge devices to network - Adding wireless edge devices to a network distributes the bandwidth further and slows down the network. Mobile devices, smartphones, laptops, and IPad use the bandwidth slowing down the network. • Voice over IP – VOIP is the technology for delivering voice communications and multimedia sessions over Internet Protocol (IP) networks, like the Internet. Calls made over the Internet can cause network Loss and delay the system ruining the conversation. • Increase in number of applications - Each application requires resources to run on the network, as users increase the application load on the system increases slowing down the network. Expected differences in data transfer rates for users on a wired LAN and those using wireless laptops. For wired LAN or WLAN (Wireless LAN) the optimization of bandwidth varies. In wired LAN medium loss of wire and capacitance coupling loss added in the bandwidth reduction. In a wireless system there is the factor which affects the performance of a network like distance between the router and the client computer and inter-channel interference affects the performance of the network. By using the router in system loss of wire is reduces and loss of wireless system increases as distance between router and client computers increases. Issues that should be considered when allocating and load balancing network resources. From the Two kinds of node constraints will affect node behaviors these characterize nodes are individual requirements and social requirements. The maximum load this node can carry is called the max load constraint node. Each node has its own transmission capacity limit and energy consumption concerns these constraints are important. Node load balance is the second constraint and is important to network design and optimization load balancing. Without considering the node load balance, the traditional routing design methodology, that the shortest route is always chosen, may result in congestion on the center of a network or hotspots. The energy from the nodes in these areas can be drained much faster in a congested area or a hotspot. TCP/IP protocols are used for connection and transportation of data as well as verifying the correct delivery. IP protocol is used for identifying source, destination of data packets and responsible for moving date packets over an IP network. Separating ingress and egress traffic helps establish compartmentalized network domains. What comes in is treated differently than what goes out. Trusted internal users should not pass malicious traffic and services and sensitive systems should be shielded from unauthorized use by external parties. To help overcome some of the know issues related to data flow and users, it technicians need to consider information controlling" is the analysis, evaluation, and importance attached to the electronic data that is collected and provided with the data under various criteria. An optimized user transmission rate can stabilize a network, and improve the actual obtained utility without causing network congestion. The resource competition among users has to be solved to improve the total resource application, when multiple users are on a wireless network each individual users behaviors may not lead to the optimum performance. To analyze and manage network performance the quality of service (QoS) metrics to collect for analysis. Bandwidth required by an application is captured by the bandwidth metric. Bandwidth decreases when traffic is transmitted across the link increases. This metric assumes data is transmitted continuously instead of sending data in a best effort over intervals of time. The delay metric tells how long it takes packets to reach their destination. Packets that arrive faster can be delayed at the receiver this metric is expressed as a bound that should not be exceeded. It is usually specified as the one-way delay rather than the round-trip delay. The variation in delay that different packets of the same connection experience is measured by the jitter metric. As a distribution or by maximum and minimum bounds is how this metric can be expressed. During transmission this fraction of packets may be lost because of queue overflow under congestion, and bit errors are expressed by this metric. References Retrieved from http://condor.depaul.edu/jkristof/technotes/congestion.pdf Retrieved from http://www.manageengine.com/products/netflow/allaboutqos.html Retrieved from http://geniusone.com
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