Software Defined Networks (SDN) Essay Example | Topics and Well Written Essays - 1000 words

Software Defined Networks (SDN) - Essay Example According to capability and application definition SDN seeks to provide a standard based application development platform and commoditize network hardware. This includes taking most of the functionality and features that exist in custom proprietary software then directing it in to an open SDN space. An in-depth on how SDN is implemented is that the system is incorporated in underutilized servers that information technology organizations already operate and own. In summary, the firmware of routers and network switches that has for a long time remained under the control of the companies that manufacture this equipment is been changed by making this remotely modifiable and remotely accessible through third party software clients, making use of open flow an example an open protocol. SDN allows for external access to the innards of routers and switches that were formally proprietary and closed and also for quick optimization and experimenting of routing or switching policies. The switchin g fabric of conventional Layer 2/3 networks serves as a routing and switching fabric for the blade center server chassis. These switches have the capability of layer 2 switching and layer three routing providing security and flexible traffic management in the chassis. The layer 2/3 fiber GbE and Copper switching modules provides full layer 2 switching making capabilities available such as link aggregation control, Cisco Ether channel, advanced spanning tree protocols and 802.1Q VLANs, Internet Group Management Protocol (IGMP), performance features and application delivery such as granular QOS, multicasting and snooping (‘Nortel Networks Layer 2/3 Gbe Switch Module’ 2004). The open flow technology showcases network programmability through the remote control application. This is all about remotely and directly programming a network switch to handle traffic dynamically in a particular way making use of the CLI type of commands. An example, to achieve the forward flow to a particular switch port, ensure other flows are blocked, while the switch is programmed to make such actions alternate in a predefined manner i.e. time interval of say 40 seconds. Use this demonstration using a number of servers that are to listen to the same multicast address while the switch is being programmed to allow a single server to give air play to a single client in the case of video servers. This application is applicable in the context of software defined networking as it empowers the operator, user and administrator to have an own definition of treating traffic. This, in a way, resembles the activities and operations of a TV remote control where one is able to switch through channels only that in this case it is automatic. This is transparent to the end host in that clients and video servers are unaware of the switch managing or controlling the traffic (Anderson, c, et al, 2009 Remote Control SDN). A command line interface (CLI) is a dialog or an interface where two prog rams or the user and the program pass a command line in SDN it is an essential key aspect. Such command lines used in software defined networks are some of the windows shell and OS/2 presentation manager these graphical interfaces helps programs and users communicate with their execution strategies such as opening programs and documents. The registry or the graphical shell is where these commands are stored. In SDN standard input/output interface (stdin $ stdout) can be

Where to Invest Housing Vs Stock Market Essay Example | Topics and Well Written Essays - 500 words

Where to Invest Housing Vs Stock Market - Essay Example This also means that the investors have to rationally decide investing into different markets and instruments which coincide with their investment preferences therefore, choosing between investing into stock market or housing market is based on such investment preferences. It is generally believed that prices in housing market tend to inflate at the time when stock market performs better. This correlation suggests that a high performing stock market tend to improve the overall economic environment which also supports other markets. However, what is also important is the fact that while considering making a decision to investing into housing or stock market is dependent on the returns offered by the alternative investments at the acceptable level of risk. (Blake, 2000). Therefore, if all other things do not change; investor will make a decision where return is higher and risk is minimum. What is however, most critical is the fact that investors often face dilemma when the respective risk profiles of markets start to show greater volatility. It is very well known that making an investment into stock market is the riskiest investment because stock markets, historically, have shown greater volatility, hence greater risk, over the long period of time.