Design the following for availability, reliability, and performance. Explain and

Question

Design the following for availability, reliability, and performance. Explain and support your choices. Include a table of components, quantity, and prices:

Local area network (LAN) (host to switch using a hybrid of cables and wireless options)

LAN backbone design (utilizing fiber optics)

Wide area network (WAN) design with a primary connection and backup connection for redundancy

IP addressing scheme for the organization’s network (Class B private network address)

Network security hardware and recommended security policy components

Disaster recovery or business continuity plan with redundant systems model in the design

Explanation / Answer

Reliability is the wellspring for the other RAM system attributes of Availability and Maintainability. Reliability was first practiced in the early start-up days for the National Aeronautics and Space Administration (NASA) when Robert Lusser, working with Dr. Wernher von Braun's rocketry program, developed what is known as "Lusser's Law" [1]. Lusser's Law states that that the reliability of any system is equal to the product of the reliability of its components, or the so-called weakest link concept.

The term "reliability" is often used as an overarching concept that includes availability and maintainability. Reliability in its purest form is more concerned with the probability of a failure occurring over a specified time interval, whereas availability is a measure of something being in a state (mission capable) ready to be tasked (i.e., available). Maintainability is the parameter concerned with how the system in use can be restored after a failure, while also considering concepts like preventive maintenance and Built-In-Test (BIT), required maintainer skill level, and support equipment. When dealing with the availability requirement, the maintainability requirement must also be invoked as some level of repair and restoration to a mission-capable state must be included. One can see how logistics and logistic support strategies would also be closely related and be dependent variables at play in the availability requirement. This would take the form of sparing strategies, maintainer training, maintenance manuals, and identification of required support equipment. The linkage of RAM requirements and the dependencies associated with logistics support illustrates how the RAM requirements have a direct impact on sustainment and overall LCC. In simple terms, RAM requirements are considered the upper level overarching requirements that are specified at the overall system level. It is often necessary to decompose these upper level requirements into lower level design-related quantitative requirements such as Mean Time Between Failure/Critical Failure (MTBF or MTBCF) and Mean Time To Repair (MTTR). These lower level requirements are specified at the system level; however, they can be allocated to subsystems and assemblies. The most common allocation is made to the Line Replaceable Unit (LRU), which is the unit that has lowest level of repair at the field (often called organic) level of maintenance.

A network is basically all of the components (hardware and software) involved in connecting computers across small and large distances. Networks are used to provide easy access to information, thus increasing productivity for users.

benefits of networking

There are lots of advantages from build up a network, but the three big facts are-
File Sharing
From sharing files you can view, modify, and copy files stored on a different computer on the network just as easily as if they were stored on your computer.
Resource Sharing
Resources such as printers, fax machines, Storage Devices (HDD, FDD and CD Drives), Webcam, Scanners, Modem and many more devices can be shared.

Program Sharing
Just as you can share files on a network, you can often also share program on a network. For example, if you have the right type of software license, you can have a shared copy of Microsoft Office, or some other program, and keep it on the network server, from where it is also run

cost of access for the entire home or office.

There are now numerous technologies that you can use to connect Windows XP Professional–based computers and other devices within your home and small office, including traditional LAN technologies:

Ethernet

Token Ring

Fiber Distributed Data Interface (FDDI)

Windows XP Professional also supports newer technologies such as:

802.11x for wireless LANs

Home Phoneline Network Adapter (HPNA)

Infrared Data Association (IrDA) protocols

Direct cable connection

IP over ATM

Asynchronous Transfer Mode (ATM) LAN Emulation (LANE)

Microsoft Ethernet permanent virtual connection (PVC)

Remote Connections to a Private Network

You can use a Windows XP Professional–based computer to connect to a private network so that you can work at home, at a field office, or at another remote location. You can dial directly to a private network by using either an analog phone line with a modem or an Integrated Services Digital Network (ISDN) phone line. You can maintain a persistent connection to the private network by using either Frame Relay or a leased line such as T1. A third approach that has been gaining in popularity allows you to access a private network by means of an encrypted virtual private network (VPN) connection over the Internet.

Connecting to the Internet

Typically, you can connect to the Internet using an analog phone line with a modem or an ISDN phone line. Another option that is growing in popularity is a high-speed broadband connection using either cable modem or DSL. Whatever your choice, each system can directly connect to the Internet by using its own public IP address (statically or dynamically assigned) or, as was mentioned earlier, one Windows XP Professional–based computer can function as a gateway, providing shared Internet access to all the systems on your small LAN.

What’s New

Windows XP Professional builds on the Microsoft Windows 2000 local networking, dial-up, and other remote connection functionality and adds the following features:

IEEE 802.1D Transparent Bridge

Users can add multiple LAN segments (usually made of different media types) to create a single IP subnet.

ICS Discovery and Control

Private network clients can locate the ICS host, know its status, and control its Internet connection.

Windows Firewall

An upgraded firewall provides basic security for the computer, or when used in conjunction with ICS, for the remote office network.

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