When we talk about business logic - we mean the following kind of logic How we model real world business objects in our application - such as accounts, loans, travel itineraries etc How these objects are stored How these objects interact with each other - e. For simplicity and practicality, we are not going to make this distinction. In many cases, we feel this distinction is unnecessary because the control flow pattern of the Model and the Controller is very similar and conceived of at the same time.
A standard had to be created that would have the hosts follow rules relating to when they could send data and when they could not. If a collision is detected, both of the senders will send a jam signal over the Ethernet.
This jam signal indicates to all other devices on the Ethernet segment that there has been a collision, and they should not send data onto the wire.
Common Logical Network Topologies Peer to Peer - A peer to peer network is one in which lacks a dedicated server and every computer acts as both a client and a server. This is a good networking solution when there are 10 or less users that are in close proximity to each other.
A peer to peer network can be a security nightmare, because the people setting permissions for shared resources will be users rather than administrators and the right people may not have access to the right resources.
More importantly the wrong people may have access to the wrong resources, thus, this is only recommended in situations where security is not an issue. P2P file sharing networks work under a similar architecture, however, there are differences between them and the LAN networking architecture.
Security and permissions can be managed by 1 or more administrators which who set permissions to the servers' resources. This type of network also allows for convenient backup services, reduces network traffic and provides a host of other services that come with the network operating system.
VPN - A virtual private network is one that uses a public network usually the Internet to connect remote sites or users together.
Companies use site to site VPN to support critical applications to connect offices to remote users. Instead of using a dedicated, real-world connection such as leased line, a VPN uses "virtual" connections routed through the Internet from the company's private network to the remote site or employee.
VLAN - A virtual LAN is a local area network with a definition that maps workstations on a basis other than geographic location for example, by department, type of user, or primary application.
The virtual LAN controller can change or add workstations and manage load-balancing and bandwidth allocation more easily than with a physical picture of the LAN. Network management software keeps track of relating the virtual picture of the local area network with the actual physical picture.
These cables could be of multiple different types and mediums such as phone networks, data lines, copper based, fiber channel, etc. As with Vertical Cross Connect configurations, these locations can be of multiple different network types and mediums.
These rooms are generally some form of telecommunications closet in a facility and it is used to connect all of the different types of incoming and outgoing media types on the LAN.
They have a pair standard non-split capacity and generally are unsuited for traffic and data network communications above 10 megabits per second Mbps. One example of this is where all of the phone cabling inside a facility is run to planned phone locations e.
When the local telephone company makes the external connections then all circuits are completed. On one side of the block wires are punched down into RJ connectors for voice and RJ connectors for data communications. This is where the wire distribution frame for connecting equipment inside a facility to cables and subscriber carrier equipment outside of the facility occurs and this is considered a demarcation point of the operational control of the internal systems where it changes over to the control of the external presence.
The device handles all of the code and protocol differences between the two networks and is often the actual demarcation point between the two service entities. This may be the pulls of copper phone and data lines to the running of fiber optic medium from the different cross connect locations.
Wire termination is also a consideration on fiber optic pulls as well which requires a higher set of skill level. Network Devices Domain 3. Common Network Devices Hub - A physical layer network device used to connect multiple Ethernet devices together.
Active hubs act as a repeater and boost the signal in order to allow for it to travel farther, while passive hubs simply pass the signal through. Most hubs have an uplink port that allows them to connect to other hubs, a router, or other network devices.
Attentuation is the degradation of a signal as it travels farther from its origination. Repeaters do not filter packets and will forward broadcasts. Both segments must use the same access method, which means that you can't connect a token ring segment to an Ethernet segment.
Repeaters can connect different cable types as shown in the image. Modem - The modem is a device that converts digital information to analog by MODulating it on the sending end and DEModulating the analog information into digital information at the receiving end. Most modern modems are internal, however, they can be internal or external.
External modems are connected to the back of the system board via a RS serial connection. The modem contains an RJ connection that is used to plug in the telephone line.
Modems have different transmission modes as follows: Simplex - Signals can be passed in one direction only. Half Duplex - Half duplex means that signals can be passed in either direction, but not in both simultaneously.
Half-duplex modems can work in full-duplex mode. Full Duplex - Full duplex means that signals can be passed in either direction simultaneously. Modems can also be classified by their speed which is measured by the BAUD rate.The ultimate resource for learning how to create and deliver better business presentations.
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One of these patterns is to separate the data-access code from the business-logic code that governs access to the data or that provides other business rules.
In this pattern, these two layers are separate from the presentation layer, which consists of the pages that the Web site user accesses to view or change data. DIY Nukeproofing: A New Dig at 'Datamining' 3AlarmLampScooter Hacker.
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The Service Layer does this for the Business to Presentation layer communication while external services are adapted inside the Data Layer. I can’t totally ignore the data access code, in my case Entity. It contains all of the behavior of the application, including presentation, business, and data access logic.
Figure shows the file structure of a single-project app. Figure