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TechKnowSurge Catalog Videos What are Nodes?
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What are Nodes?

Network nodes are any devices connected within a network, divided into two categories: end devices that serve as the source or destination of traffic, and intermediary devices that facilitate communication between them.

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About this video

A network node is any device connected to a network via network media, whether that media is copper cabling, fiber, or wireless transmission. Every device that attaches to the network — from a laptop to a printer to a router — qualifies as a node, making the concept fundamental to understanding how networks are structured and how traffic moves through them. Nodes are classified into two categories based on their role in the network. End devices are the source or destination of all network communication. These include computers, laptops, tablets, printers, and servers — the devices where users and applications generate and receive data. Intermediary devices, by contrast, are purpose-built to interconnect end devices and manage the flow of traffic between them. Switches and routers are common examples, and their role is strictly to enable communication rather than to originate or terminate it. Understanding the distinction between end devices and intermediary devices is essential for network design, troubleshooting, and security. Knowing where traffic originates, where it terminates, and which devices handle it in transit forms the foundation for analyzing network behavior and identifying potential points of failure or vulnerability.

What you'll learn

What's covered

Network Nodes

Aligned to

Cisco CCNA
1.1 Explain the role and function of network components
Cisco CCST Networking
3.3 Describe endpoint devices
1.1 Identify the fundamental conceptual building blocks of networks
CompTIA Network+
1.2 Compare and contrast networking appliances, applications, and functions

Key terms

Network Node
Any device connected to a network via network media, including both end devices and intermediary devices.
Endpoint
Any device that connects to a network, including computers, smartphones, tablets, and IoT devices.
Server
A computer or program that provides services or resources to other devices, known as clients, over a network.
Switch
A network device that connects devices within a LAN and forwards traffic based on MAC addresses.
Router
A network device that forwards data packets between networks based on IP addresses.
Intermediary Device
A network node, such as a switch or router, that interconnects end devices and facilitates communication between them rather than serving as a source or destination of traffic.

Transcript

What Is a Network Node?

What do a printer, a laptop, switches, and routers all have in common? Well, they're all network nodes.

We have our network media, which in this case, let's say, are all copper lines that are interconnecting all these devices. So that's our network media. Well, anything that we're connecting together with this network media, those are all nodes. So these are the nodes within this network.

End Devices and Intermediary Devices

When it comes to network nodes, we essentially have two different types. We have end devices. These are the source or destination of traffic, so end devices would be our computers, our laptops, our servers. Our intermediary devices are those that help us interconnect these devices. So these would be the intermediary devices that help interconnect and facilitate the communication back and forth.

So these are all examples of nodes, and the nodes over here on this side are our end devices: our laptop, our printer, our tablet. These are all devices that are the source or destination of the communication, and so these are what we are actually performing these functions on, versus this over here, which is the intermediary devices. These intermediary devices were designed just to interconnect our end devices. So these are what nodes are.

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