Nothing on a Cisco switch is easier to screw up than entering a MAC address manually. Each time a host is connected to the switch, you’d have to make a static entry for that host, which is easy to forget and even easier to mistype.We could build a MAC address table consisting only of static entries, but that approach has serious drawbacks: It’s the source MAC addresses that are used to build the all-important MAC address table. The switch looks at the source address of an incoming frame before it looks at the destination address. There are two 48-bit MAC addresses contained in every frame, one for the source of the frame and the other for the destination. The switch builds a table of Layer 2 addresses, typically known as MAC (Media Access Control) addresses. Flood (fancy talk for “send it out every port except the one it rode in on”).When a switch receives a frame, the switch takes one of three actions with that frame: You don’t need to read the first two lessons in this course to understand this lesson, but have a look when you’re done here - the first part is on CSMA/CD and the second on bridges, switches, and broadcast domains. In this section of this free CCNA and Network+ course on switch fundamentals, we’ll take a detailed look at how a switch builds its all-important MAC address table. Study anywhere, anytime - and get ready for exam and real-world success with Chris Bryant’s CCNA Video Boot Camp! CCNA and Network+ Tutorial: How A Switch’s MAC Address Table Is Built You get immediate access to 27 hours of my world-class Video Boot Camp training for only $9.99, and right now, you get my CCNA Security course FREE with your enrollment!Įvery video in the course is downloadable and your access never expires. Take a CCNA Video Boot Camp with Chris Bryant - without leaving home!
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