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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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   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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   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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   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

   See all results for this question

   What is the purpose of a MAC address?

   • The purpose of the MAC address is to provide a unique identification for each device. There aren't enough IP addresses to do that. Not to mention that IP addresses can be easily changed. Did you not read what I wrote? There are vastly more unique MAC addresses than there are IP addresses.

   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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3. networkengineering.stackexchange.com › questions › 10899Why each and every single port on Layer 2 switches need to ...

   networkengineering.stackexchange.com › questions › 10899

   Layer 2 switches do not need the base Ethernet MAC address of the device nor its switchport MAC addresses to operate. The source and destination MAC addresses of the incoming frame are examined, the first one being saved in the MAC address table along with the receiving port, while the destination MAC address being looked up in the MAC address ...

   • switch

     The MAC address is the "hardware address" which uniquely...

4. networkengineering.stackexchange.com › questions › 16385switch - Why cisco switches have many mac-addresses ...

   networkengineering.stackexchange.com › questions › 16385

   The MAC address is the "hardware address" which uniquely identifies a virtual device (such as an SVI or loopback interface), a host, a port or what-have-you at Layer 2 of your network. These extra MAC addresses are utilized by managed devices (such as Cisco switches) to provide additional functionality beyond that of a "dumb" switch or hub.

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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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

   • Cached

   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 › 34765Why do we need MAC Address if we can uniquely identify each ...

   networkengineering.stackexchange.com › questions › 34765

   Switches do not look inside the frame to inspect the IP address. This allows layer-2 and switches to carry any layer-3 protocol (IPv4, IPX, IPv6, etc.). IP addresses are layer-3 addresses, and they are only looked at by layer-3 devices, e.g. routers.

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

   superuser.com › questions › 968340

   Sep 4, 2015 · 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.

9. www.howtogeek.com › 228286 › how-is-the-uniquenessHow is the Uniqueness of MAC Addresses Enforced? - How-To Geek

   www.howtogeek.com › 228286 › how-is-the-uniqueness

   • Cached

   Sep 8, 2015 · 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.

10. 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.