Networking hardware

Network Packet

Networking hardware, also known as network equipment or computer networking devices, are electronic devices which are required for communication and interaction between devices on a computer network.

- Networking hardware
Network Packet

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Rack containing several enterprise class routers connected to multiple networks

Router (computing)

Rack containing several enterprise class routers connected to multiple networks
Home and small office wireless router
A typical home or small office DSL router showing the telephone socket (left, white) to connect it to the internet using ADSL, and Ethernet jacks (right, yellow) to connect it to home computers and printers.
A screenshot of the LuCI web interface used by OpenWrt. This page configures Dynamic DNS.
The first ARPANET router, the Interface Message Processor was delivered to UCLA August 30, 1969, and went online October 29, 1969

A router is a networking device that forwards data packets between computer networks.

ARSAT data center (2014)

Data center

Building, a dedicated space within a building, or a group of buildings used to house computer systems and associated components, such as telecommunications and storage systems.

Building, a dedicated space within a building, or a group of buildings used to house computer systems and associated components, such as telecommunications and storage systems.

ARSAT data center (2014)
NASA mission control computer room c. 1962
Racks of telecommunications equipment in part of a data center
Perforated cooling floor tile.
A typical server rack, commonly seen in colocation
CRAC Air Handle
A bank of batteries in a large data center, used to provide power until diesel generators can start
Typical cold aisle configuration with server rack fronts facing each other and cold air distributed through the raised floor.
FM200 Fire Suppression Tanks
Google Data Center, The Dalles, Oregon
Data center at CERN (2010)
This water-cooled data center in the Port of Strasbourg, France claims the attribute green.
An operation engineer overseeing a network operations control room of a data center (2006)
An example of network infrastructure of a data center
A 40-foot Portable Modular Data Center

The availability of inexpensive networking equipment, coupled with new standards for the network structured cabling, made it possible to use a hierarchical design that put the servers in a specific room inside the company.

Avaya ERS 2550T-PWR, a 50-port Ethernet switch

Network switch

Avaya ERS 2550T-PWR, a 50-port Ethernet switch
A modular network switch with three network modules (a total of 24 Ethernet and 14 Fast Ethernet ports) and one power supply.
A 5-port layer-2 switch without management functionality
A rack-mounted 24-port 3Com switch
A couple of managed D-Link Gigabit Ethernet rackmount switches, connected to the Ethernet ports on a few patch panels using Category 6 patch cables (all equipment is installed in a standard 19-inch rack)

A network switch (also called switching hub, bridging hub, and, by the IEEE, MAC bridge ) is networking hardware that connects devices on a computer network by using packet switching to receive and forward data to the destination device.

Network Packet

Gateway (telecommunications)

Network Packet

A gateway is a piece of networking hardware or software used in telecommunications networks that allows data to flow from one discrete network to another.

Cisco Aironet wireless access point

Wireless access point

Cisco Aironet wireless access point
Linksys "WAP54G" 802.11g wireless router
Embedded RouterBoard 112, widely used by wireless Internet service providers (WISPs) across the world, with U.FL-RSMA pigtail and R52 mini PCI Wi-Fi card

In computer networking, a wireless access point (WAP), or more generally just access point (AP), is a networking hardware device that allows other Wi-Fi devices to connect to a wired network.

A human computer, with microscope and calculator, 1952

Host (network)

Computer or other device connected to a computer network.

Computer or other device connected to a computer network.

A human computer, with microscope and calculator, 1952

Network infrastructure hardware, such as modems, Ethernet hubs, and network switches are not directly or actively participating in application-level functions, and do not necessarily have a network address, and are not considered to be network hosts.

An animation demonstrating datagram type of packet switching across a network

Packet switching

Method of grouping data into packets that are transmitted over a digital network.

Method of grouping data into packets that are transmitted over a digital network.

An animation demonstrating datagram type of packet switching across a network
NSFNET Traffic 1991, NSFNET backbone nodes are shown at the top, regional networks below, traffic volume is depicted from purple (zero bytes) to white (100 billion bytes), visualization by NCSA using traffic data provided by the Merit Network.

As they traverse networking hardware, such as switches and routers, packets are received, buffered, queued, and retransmitted (stored and forwarded), resulting in variable latency and throughput depending on the link capacity and the traffic load on the network.

A high-level overview of network bridging, using the ISO/OSI layers and terminology

Network bridge

A high-level overview of network bridging, using the ISO/OSI layers and terminology

A network bridge is a computer networking device that creates a single, aggregate network from multiple communication networks or network segments.

Network Packet

Computer network

Set of computers sharing resources located on or provided by network nodes.

Set of computers sharing resources located on or provided by network nodes.

Network Packet
Common network topologies
A sample overlay network
Network links
Fiber optic cables are used to transmit light from one computer/network node to another
2007 map showing submarine optical fiber telecommunication cables around the world.
Computers are very often connected to networks using wireless links
An ATM network interface in the form of an accessory card. A lot of network interfaces are built-in.
A typical home or small office router showing the ADSL telephone line and Ethernet network cable connections
Firewalls
The TCP/IP model and its relation to common protocols used at different layers of the model.
Message flows between two devices (A-B) at the four layers of the TCP/IP model in the presence of a router (R). Red flows are effective communication paths, black paths are across the actual network links.
SONET & SDH
Asynchronous Transfer Mode
Routing calculates good paths through a network for information to take. For example, from node 1 to node 6 the best routes are likely to be 1-8-7-6, 1-8-10-6 or 1-9-10-6, as these are the shortest routes.
Partial map of the Internet, based on the January 15, 2005 data found on opte.org . Each line is drawn between two nodes, representing two IP addresses. The length of the lines is indicative of the delay between those two nodes. This graph represents less than 30% of the Class C networks reachable.

The nodes of a computer network can include personal computers, servers, networking hardware, or other specialised or general-purpose hosts.

4-port 10BASE-T Ethernet hub with selectable MDI-X/MDI port

Ethernet hub

4-port 10BASE-T Ethernet hub with selectable MDI-X/MDI port
8-port Ethernet hub with one 10BASE2 connector and eight 10BASE-T ports

An Ethernet hub, active hub, network hub, repeater hub, multiport repeater, or simply hub is a network hardware device for connecting multiple Ethernet devices together and making them act as a single network segment.