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1. 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.

2. 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.

3. 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.

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

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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.

5. 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.

6. Videos

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

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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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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. 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

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   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.

9. People also ask

   Why does a switch need a MAC address?

   • 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.

   Why do we use MAC addresses for local communication (ARP) instead o…

   superuser.com/questions/1242528/why-do-we-use-mac-addresses-for-local-communication-arp-instead-of-ip-addresse

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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 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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   Can a network device communicate with a different MAC address?

   • 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. If two devices have the same MAC address (which occurs more often than network administrators would like), neither computer can communicate properly.

   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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