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1. • Identify different ports and devices

     • MAC addresses need to be unique or at least highly unlikely to be repeated for switches to identify different ports and devices, which is why manually setting a MAC address can have unexpected consequences in a switched network.
     Reference:

     Switch Mac Basis. Switch Mac Address Table Basis - FS Community

2. People also ask

   Why do switch MAC addresses need to be unique?

   • MAC addresses need to be unique or at least highly unlikely to be repeated for switches to identify different ports and devices, which is why manually setting a MAC address can have unexpected consequences in a switched network. Switches usually have a bunch of MAC addresses reserved in its MAC address table.

   Switch Mac Basis. Switch Mac Address Table Basis - FS Community

   community.fs.com/article/switch-mac-address-whats-it-and-how-does-it-work.html

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   Why does a switch need a MAC address?

   • Absent a destination address in its MAC address table, the switch needs to flood the frame our every other interface, and that is pretty inefficient and wasteful of bandwidth on all the other interfaces. Switches do not look inside the frame to inspect the IP address.

   Why do we need MAC Address if we can uniquely identify each machine

   networkengineering.stackexchange.com/questions/34765/why-do-we-need-mac-address-if-we-can-uniquely-identify-each-machine-with-an-ip-a

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   Can a MAC address be changed?

   • MAC addresses are 'burned' into the Network Interface Card (NIC), and cannot be changed. See ARP and RARP on how IP addresses are translated into MAC addresses and vice versa. In order for a network device to be able to communicate, the MAC address it is using must be unique. No other device on that local network subnet can use that MAC address.

   How is uniqueness of MAC addresses enforced? - Super User

   superuser.com/questions/968340/how-is-uniqueness-of-mac-addresses-enforced

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   What happens when a device changes IP address and MAC address?

   • When a device changes both its IP address and MAC address, the network switch reacts by updating its address tables. The switch identifies the new MAC address as a unique device and associates it with the specific port it’s connected to.

   Why is the Switch MAC Address Critical for Network Functionality?

   ascentoptics.com/blog/why-is-the-switch-mac-address-critical-for-network-functionality/

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   How does a network switch handle dynamic MAC addresses?

   • A network switch handles dynamic MAC addresses based on its MAC address learning function. In general scenarios, when a device connects to a switch port, the switch learns the device’s MAC address and updates its MAC address table accordingly. If a device disconnects or if its MAC address changes, the switch updates the table to reflect the change.

   Why is the Switch MAC Address Critical for Network Functionality?

   ascentoptics.com/blog/why-is-the-switch-mac-address-critical-for-network-functionality/

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   How many MAC addresses does a network switch have?

   • For a network switch, it is likely to have many MAC addresses, since one MAC address is assigned to every interface on the switch. A MAC address, also known as “hardware address” or “physical address”, is a binary number used to uniquely identify computer network adapters.

   Switch Mac Basis. Switch Mac Address Table Basis - FS Community

   community.fs.com/article/switch-mac-address-whats-it-and-how-does-it-work.html

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3. superuser.com › questions › 968340How is uniqueness of MAC addresses enforced? - Super User

   superuser.com › questions › 968340

   Sep 4, 2015 · See ARP and RARP on how IP addresses are translated into MAC addresses and vice versa. In order for a network device to be able to communicate, the MAC address it is using must be unique. No other device on that local network subnet can use that MAC address.

   • Reasons not to assume device MAC address is unique

     MAC addresses are not unique. There can be, and will be...

4. superuser.com › questions › 1258721Reasons not to assume device MAC address is unique

   superuser.com › questions › 1258721

   Oct 13, 2017 · MAC addresses are not unique. There can be, and will be duplicates with MACs. There are several reasons for that, one being that they need not be (globally) unique. The MAC must be unique on the local network, so ARP/NDP can do its job, and the switch knows where to send incoming datagrams to.

5. Videos

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     How does a switch learn MAC Addresses

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     How does a switch learn MAC Addresses: Configuration

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     How Switch learns the MAC addresses Explained: A Comprehensive Guide | NS3EDU

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6. ascentoptics.com › blog › why-is-the-switch-macWhy is the Switch MAC Address Critical for Network ...

   ascentoptics.com › blog › why-is-the-switch-mac

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   Dec 28, 2023 · The Switch MAC Address enhances network security by enabling device authentication and authorization based on their MAC Addresses. This process helps ward off unauthorized access and strengthens network security protocols.

7. networkengineering.stackexchange.com › questions › 78616Why switch uses Mac address during implementation of spanning ...

   networkengineering.stackexchange.com › questions › 78616

   Switches have a MAC address table that relates the MAC address to the interface on which the last frame with the source MAC address was seen. The table is used to forward frames to the specific interface for the destination MAC address.

8. community.fs.com › article › switch-mac-addressSwitch Mac Basis. Switch Mac Address Table Basis - FS Community

   community.fs.com › article › switch-mac-address

   • Cached

   Sep 29, 2021 · MAC addresses need to be unique or at least highly unlikely to be repeated for switches to identify different ports and devices, which is why manually setting a MAC address can have unexpected consequences in a switched network.

9. robots.net › internet-and-connectivity › wifi-andHow Is A MAC Address Used By A Network Switch - Robots.net

   robots.net › internet-and-connectivity › wifi-and

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   Dec 22, 2023 · Learn how network switches use MAC addresses to efficiently forward data packets and manage network traffic. Understand the importance of MAC addresses in optimizing network performance.

10. superuser.com › questions › 1242528networking - Why do we use MAC addresses for local ...

    superuser.com › questions › 1242528

    Aug 20, 2017 · The IP protocol is indeed used to uniquely address a certain device on your network, but when it's time for a switch to decide where to actually physically send the data (or the device itself when it has a MAC address cache), it needs to translate that IP address to the MAC address to which that IP address was assigned to.