ccna 200-301 network simulator toolstation opening

ccna 200-301 network simulator toolstation opening.2.1.4 By Service Mode* Computer networks can be classified according to the service mode of the network into two types: client/server networks and peer-to-peer networks.1. Client/Server (Client/Server) network server is a high-performance computer or dedicated equipment dedicated to providing services, the client is the user computer. This is a form of network in which clients send requests to servers and receive services.This is a form of network in which clients request and receive services from the server, and multiple clients can share the various resources provided by the server. This is the most common and important type of network. It is suitable not only for networking similar computers, but also for, 14Chapter 2 Network Interconnection and Reference Models*** I02networking of different types of computers, such as mixed networking of PCs and Macs. This kind of network security can be easily ensured, computer permissions and priorities are easily controlled, monitoring is easily implemented, and network management can be standardized. Network performance depends heavily on the performance of the servers and the number of clients. Currently there are many servers optimized for this type of network, called dedicated servers.2. Peer-to-Peer (Peer-to-Peer) peer-to-peer network does not require a dedicated server, each client can talk to other clients, sharing each other's information resources and hardware resources, and the type of computers in the network is generally the same. This network method is flexible and convenient, but it is more difficult to achieve centralized management and monitoring, and the security is also low, which is more suitable for small networks working together within departments.There are also informal classification methods, such as enterprise networks and campus networks, which can be understood according to the name. There are different ways of classifying networks from different perspectives, and each network name has a special meaning. Understanding the classification methods and type characteristics of networks is one of the important foundations for becoming familiar with network technology.Legitimate 2.2 Network ArchitectureIn December 1969, DARPA's computer packet switching network, ARPANET, went into operation. The success of ARPANET marked a new era in the development of computer networks o The successful operation of ARPANET brought about a fundamental change in the concept of computer networks. The earlier terminal-oriented computer networks were star networks centered on a single host, with each terminal sharing the hardware and software resources of the host through the transmission medium. The packet-switched network, however, is centered on a communication subnet, with both hosts and terminals at the edge of the network. The hosts and terminals form the user resource subnet, and the users not only share the resources of the communication subnet, but also share the rich hardware and software resources of the user resource subnet. This kind of computer network centered on the communication subnet is often referred to as a second-generation computer network.