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Lesson 5 Network hardware and software
Objective Describe hardware and software network connection devices.

Network Hardware and Software

Networks are composed of hardware and software components. Each hardware and software component has a different function to perform. However, network operating system (NOS) software makes all the different components work together as a single network. NetWare, Solaris, Linux, AIX, and Windows NT are examples of NOS software. The figure below is a diagram of a simple network.

Network diagram consisting of Extranet Client, Internet Client, Internet Server, Extranet Server, Switch and Router


A bridge is a network device that's used to segment one network into two segments. Isolating the traffic into separate segments eases network traffic congestion. The bridge accomplishes this by reading the unique hardware address (called the Media Access Control) of each network device to determine the appropriate segment. It performs the same functions as a repeater.


A gateway comprises hardware and software that acts as a translator between networks using incompatible communications protocols. Gateways are commonly used to connect networks of personal computers to minicomputer or mainframe based hosts.
A gateway is a node on a network that serves as an entrance to another network. In enterprises, the gateway is the computer that routes the traffic from a workstation to the outside network that is serving the Web pages. In homes, the gateway is the ISP that connects the user to the internet. The gateway is also associated with both
  1. a router, which use headers and forwarding tables to determine where packets are sent, and
  2. a switch, which provides the actual path for the packet in and out of the gateway.
Hub: A hub (or concentrator) interconnects multiple devices in a network. Hubs enable distribution of information among connected devices.


A repeater receives and transmits signals and duplicates them onto another network segment. Repeaters extend the maximum length of a segment and increase the number of possible connected devices.

Network Topology

Solution In a Box

Many large companies are choosing a low-cost Internet access solution called Solution-in-a-box. Solution-in-a-box systems provide networks with a single Internet connection. These devices are typically black boxes with a single phone line connection and a single network connection.
In the next lesson, the different types of servers and their functionality will be discussed.