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The following are some of the network devices and their corresponding functions:
Hub: Regenerates a signal when it passes through its ports. Hubs provide a common connection point for network devices. Hubs are generally used for LAN connectivity and
works at Layer 1 of the OSI model.
Firewall: Protects the network from unauthorized access attempts. It is typically placed between the Internet and a private network, but can also be placed between two private
Router: Provides a means for connecting LAN and WAN segments together. A router separates broadcast domains while connecting different logical and physical networks.
Switch: Provides a separate collision domain for each node in a company’s internal network. Switches work at Layer 2 in the Open System Interconnection (OSI) model and
perform their function by observing the source and destination MAC addresses of packets. Because of this method of operation, it can provide dedicated bandwidth to each
connected node. Advantages of switches over hubs include the ability to filter frames based on MAC addresses and to allow simultaneous frame transmissions. The diagram below
illustrates the ability of a switch to provide a separate collision domain to each device, as compared to the hub, which cannot.
Describe the impact of infrastructure components in an enterprise network
Cisco Documentation > Internetwork Design Guide > Internetworking Design Basics