What Is an Ethernet Switch?

Ethernet switches are a fundamental piece of networking hardware for the internet and network. Ethernet switches connect devices like computers, WiFi access points, IoT devices, PoE devices, and servers in an Ethernet LAN, allowing them to communicate and access the internet.

What Is Ethernet?

Ethernet technology was designed to solve packet collisions in a shared network. It does this by having devices connected to a network follow a set of rules to communicate without talking over one another. The network-connected devices connect physically with an Ethernet switch, which manages data flow between devices, applications, and data.

Ethernet is a more formal name for IEEE 802.3, a standard based on the Carrier Sense Multiple Access/Collision Detection (CSMA/CD) protocol. This defines endpoint addressing and what happens if a collision occurs, as well as transmission speeds and media. IEEE 802.3 media specifications focus on cable types (coaxial and twisted pair), bandwidth capacities (10 Mbps – Tbps), and transmission distance.

Ethernet has changed dramatically since its initial application. Today, it is the de facto protocol for IP-based networks. Ethernet switches are the most common type of network switch and the foundational technology in most networks.

How Is Ethernet Different From Wi-Fi?

Wi-Fi is an extension of an Ethernet access network that allows wireless connections to Ethernet networks. Wi-Fi provides freedom of movement without the need for a wired network connection.

From a network perspective, Wi-Fi typically requires a wireless network access point to serve as the interface. The access point connects the end device to the network.

IEEE 802 defines Ethernet by IEEE 802.3, while Wi-Fi is defined by IEEE 802.11.

How Do Ethernet Connections Differ From Wi-Fi?

An Ethernet access connection is a physical cable that provides a dedicated connection from the switch to an end device. The bandwidth of this connection is limited to the speed at which the connected port can operate.

Wi-Fi connections, on the other hand, are made wirelessly. Devices can receive a Wi-Fi signal from anywhere within the coverage area. However, they share the bandwidth with other devices connected to the same access point.

Are an Ethernet Switch and Hub the Same?

No. Although both are examples of data network hardware devices, a hub acts as a broadcast/aggregator and is part of the physical transport layer. It does not manage traffic.

In contrast, an Ethernet switch manages data flow by directing the data received on one port, using the sending and receiving MAC addresses, to another port. Switching improves network efficiency compared to hubs.

Can Ethernet Switches Act as Routers?

Yes, modern Ethernet switches can handle both types of data forwarding in a network. Routers, however, are designed to handle a larger volume of data traffic. They are equipped with advanced features to manage and direct data between different networks efficiently. 

Additionally, routers often include security features such as firewalls and VPN support to protect data as it travels between networks. This makes them essential for maintaining the performance and security of modern networks.

What is Power over Ethernet (PoE)?

Power over Ethernet (PoE) is the capability to supply low-voltage DC electrical power (up to 100W) to network devices using the same twisted-pair, copper Ethernet cables that are used to transmit data. It eliminates the need for an AC power source and allows for more flexibility in device placement without worrying about proximity to a power outlet.

PoE devices include LED lighting, window shading, monitors and sensors, wireless access points, VoIP phones, and other smart devices. It provides a simple, reliable, and flexible way to power these devices within a network. Additionally, PoE is a cost-effective solution, reducing the need for extra wiring and power infrastructure.

What Are IEEE 802.3af, IEEE 802.3at, and IEEE 802.3bt Standards?

The IEEE 802.3 standards, which define Ethernet, include the 802.3af, 802.3at, and 802.3bt standards that outline the common techniques for transmitting power over copper Ethernet cables (PoE).

IEEE PoE has evolved significantly since the original IEEE 802.3af standard, which defined DC power up to 15.4W. The IEEE 802.3at standard increased the power limit to up to 25W.

The latest standard, IEEE 802.3bt, was published in 2019. It allows for much more power, up to 100W, for high-speed connectivity via LAN connections. This advancement enables many new applications and expands the capabilities of PoE in modern networks.

How Do Ethernet Switches Work?

Ethernet switches connect devices by physically connecting them to the same switch or to another switch within the same network. These cables include coaxial fiber and twisted pair Ethernet cables.

The Ethernet switch controls the data flow between connected devices, applications and data, cloud services, and the Internet. The switching process sends incoming and outgoing traffic to the appropriate port on the switch based on the sending and destination MAC addresses. Both the sender’s and destination’s MAC addresses are included in the Ethernet frame.

Each Ethernet-compatible device has a physical address, called a MAC address, which is used by the switch to uniquely identify the device. A switch stores the MAC address of the device that sent the Ethernet packet and the port to which it is connected in a local table called the MAC Address Table. The switch checks this table to determine if the destination MAC address is also connected to the switch. If it is, the switch forwards the packet to the destination port. If it is not, the switch broadcasts the data packet to all ports while waiting for a response.

If the switch is directly connected to the destination device, the transmission is completed. If the destination device is connected to another switch, the adjacent switch continues the lookup-forward process until the frame arrives at its intended destination.

Ethernet switches come in various sizes and capacities, from small switches for home use to core switches with terabit speeds. There are three types of Ethernet switches to accommodate different network sizes and structures: core, distribution, and access. Switching networks are often arranged in a tree structure, with smaller switches at the edge, larger switches as distribution switches, and the largest switches as core switches.

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