Network architectures are sometimes classified into two broad categories:
· client-server architectures,
· peer-to-peer architectures.
In the client-server architectural model, a system is decomposed into client and server processors or processes. Servers provide computational resources (or services), which clients consume. Typically a server provides services to many clients. It is also common for clients to consume services from multiple services. Stated otherwise, there is generally a 1:M relationship between a server and its clients, and it is sometimes the case that there is a 1:M relationship between a client and the servers that it uses. The client-server architectural model supports the separation of functionality based on the service concept.
Client-server architectures are commonly organized into layers referred to as "tiers".
Tiered Architectures· Two-tier architectures. The system architecture consists of a data server layer and an application client layer. Data access computation is associated with the data server layer, and the user interface is associated with the client application layer. If most of the application logic is associated with the client application logic, it is sometimes referred to as a "fat client." If it is associated with the data access server, the application client layer is sometimes referred to as a "thin client."· Three-tier architecture. The system architecture consists of data server layer, an application server layer and a client application layer. The application server layer facilitates the separation of application logic from presentation, and promotes distributed processing.
· Multi-tier architecture. The system architecture is a superset of a three-tier architecture, and includes additional layers for data and/or application servers.
Peer-to-Peer ArchitecturesIn a peer-to-peer architecture model, a system is decomposed into computational nodes that have equivalent capabilities and responsibilities. This division is in contrast to a client-server architectural model, where client and server nodes are divided into server and client roles.An example of a peer-to-peer architecture is a system of intelligent agents that collaborate to collect, filter, and correlate information.
Sometimes layered ("tiered") and peer-to-peer architectures are combined, where the nodes in particular layers are in peer-to-peer relationships. For example, a multi-tiered architecture might include an enterprise management layer, consisting of peer nodes for such things as network management, event management, database management, Web sever management, and workload balancing.
computer networks classified into point to point and broadcast network
client server n peer to peer
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PAN stands for Personal Area Network in computer networks(area wise classified networks)
Networks can be categorized based on various criteria, including their scale, topology, and purpose. Common types include local area networks (LANs), wide area networks (WANs), and metropolitan area networks (MANs), which differ primarily in geographical coverage. Additionally, networks can be classified by topology, such as star, ring, bus, or mesh, which describes the arrangement of nodes. Finally, networks can also be categorized by their intended use, such as corporate networks, academic networks, or social networks.
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Wi-Fi networks are typically classified into three main categories: infrastructure mode, ad-hoc mode, and mesh networks. Infrastructure mode involves a central access point connecting multiple devices, while ad-hoc mode allows devices to connect directly without a central point. Mesh networks consist of multiple interconnected nodes that provide extended coverage and reliability. Each type serves different connectivity needs and use cases.
Network architectures are classified according to the way they are controlled and the distance between their nodes.
A network is defined as a collection of interconnected devices that can communicate and share resources. This includes hardware components like computers, servers, and routers, as well as the software and protocols that facilitate this communication. Networks can be classified based on their scale, such as local area networks (LANs) or wide area networks (WANs), and they enable data exchange, collaboration, and access to shared services.
Classified LMR messages are typically transported over secure communication channels, such as encrypted networks or secure messaging systems. These systems are designed to prevent unauthorized access and ensure the confidentiality of the information being transmitted. Additionally, strict protocols and procedures are in place to control access and monitor the transmission of classified messages to maintain their security.
Classifieds Free, Craigslist, and Wikalo would be the most notable and most viewed classified ads website. They provide free ad service over a range of networks and not just their own. Affiliates and joint programs help expand the options.
87. There are 39 religious networks, shopping networks, 10 News/Sports/Lifestyle networks, 15 general entertainment networks, 15 Spanish networks, 9 Public Television networks, and 5 major American networks. Note, these are just networks, there are millions of stations for each network in the US alone.