When a switch is first powered on, it does not know any MAC addresses in the network. The first six digits represent the manufacturer’s unique identifier, while the last six digits represent the NIC’s unique identifier. A MAC address is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment.Ī MAC address is a 48-bit address expressed in hexadecimal format, which means it consists of 12 hexadecimal digits. Understanding MAC addressesīefore we dive into how a switch learns MAC addresses, let us first understand what MAC addresses are. In this article, we will explore how a switch learns MAC addresses. However, for the switch to know where to send the data packets, it needs to know the Media Access Control (MAC) addresses of the devices in the network. One of the primary functions of a switch is to forward data packets between devices in the network. A switch is a networking device that connects devices together in a network. The dynamic MAC learning is vulnerable to spoofing attacks, to mitigate this, we c an manually add Static MAC entries on the switch in order to override the dynamic MAC address learning.If you have ever worked with computer networks, you may have heard of a switch. The static MAC addressin the MAC address table is manually configured for a specific port and VLAN. The Dynamic MAC address entries in the MAC address table have an aging time and can time out after a specific time. and the method of MAC learning: Static or Dynamic learning.All learned MAC addresses will be grouped into the MAC address table which will define: A Dynamic MAC address can be learned via an arp request or replies etc, coming on a specific port on the switch.
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