Notify other devices of errors and communication failures.Maintain information about which pathways exist through the network and internetwork.Processes running on the intermediary network devices perform these functions: These devices use the destination host address, in conjunction with information about the network interconnections, to determine the path that messages should take through the network. The management of data as it flows through the network is also a role of the intermediary devices. Network access devices (switches and wireless access points).
Go to the online course and view the animation.Įxamples of intermediary network devices are Intermediary devices connect the individual hosts to the network and can connect multiple individual networks to form an internetwork. These devices provide connectivity and work behind the scenes to ensure that data flows across the network. Intermediary devices interconnect end devices.
#If the computers on the network connect via the same piece of cable, what topology is employed? software#
Clients are hosts that have software installed that enables them to request and display the information obtained from the server. Servers are hosts that have software installed that enables them to provide information and services, like email or web pages, to other hosts on the network. Software installed on the host determines which role it plays on the network. In modern networks, a host can act as a client, a server, or both. When a host initiates communication, it uses the address of the destination host to specify where the message should be sent. In order to distinguish one host from another, each host on a network is identified by an address. Mobile handheld devices (such as smartphones, tablets, PDAs, and wireless debit/credit card readers and barcode scanners)Ī host device is either the source or destination of a message transmitted over the network.Computers (work stations, laptops, file servers, web servers).These devices form the interface between users and the underlying communication network. The network devices that people are most familiar with are called end devices, or hosts. Processes are less obvious to us but are critical to the operation of networks. Processes provide the functionality that directs and moves the messages through the network. Services include many of the common network applications people use every day, like email hosting services and web hosting services. A network service provides information in response to a request.
These services and processes are the communication programs, called software, that run on the networked devices. Network components are used to provide services and processes. In the case of wireless media, for example, messages are transmitted through the air using invisible radio frequency or infrared waves. Occasionally, some network components may not be visible. Hardware comprises the components of the network platform that typically are visible, such as a laptop, PC, switch, router, wireless access point, or the cabling used to connect the devices. The network infrastructure contains three categories of network components:ĭevices and media are the physical elements, or hardware, of the network. It provides the stable and reliable channel over which our communications can occur.
This network infrastructure is the platform that supports the network. The path that a message takes from source to destination can be as simple as a single cable connecting one computer to another or as complex as a network that literally spans the globe. In this section you will begin to learn about the devices and equipment that work together in networks. In this section you will begin to explore the pieces that come together to enable network communications. Most web users never consider how the Internet works.
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