A router is a networking device that connects to various local area networks and wide area networks in the Internet. It allows multiple computers or devices to connect to the Internet through a single connection. It transfers packets of data between networks to establish and sustain communication between two nodes in an internetwork. Besides, it automatically selects and sets routes according to the channel conditions, and sends signals in the optimal path in order.
Router works at the third layer (network layer) of the OSI model. A router uses the destination IP address in a data packet to determine where to forward the packet. In addition, it manages the flow of data so that each computer gets the right information it needs. Routers also can be used to connect multiple networks.
A wireless router is a device that performs the functions of a router and also includes the functions of a wireless access point. It is used to provide access to the Internet or a private computer network. Depending on the manufacturer and model, it can function in a wired local area network, in a wireless-only LAN, or in a mixed wired and wireless network.
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A managed switch is a configurable network switch, which offers greater security, flexibility, and capacity than an unmanaged switch or normal switch. It serves as a controller, enabling networked devices to talk to each other efficiently. As a network switch, it works at the second layer (data link layer) of the OSI reference model.
Managed switches are usually used to offer the most comprehensive functions for a network. Endowed with various function managements such as VLAN, CLI, SNMP, IP routing, QoS, etc, a managed switch is often seen in the core layer of a network, especially in large and complex data centers. With the increasing needs, parts of the most common two network switches, Gigabit Ethernet switch and 10GbE switch, are designed as managed switches.