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It depends on the class of the switch, for example:

• Wifi routers and home routers have LAN Isolation, however this one is usually disabled by default
• Layer 2/3 campus class switches usually have ARP filtering, but if it's not enabled than you can spoof MAC or IP address from different VLAN (you can use same MAC or different one for any IP address). The one I mean here is the one implemented at the Layer 3 gateway.
• Some new campus like switches (as of 2016) have LAN Isolation built-in as well, however it's not enabled by default, which helps with ARP spoofing
• Some networks require IEEE 802.1X authentication to connect to the port, usually corporate equipment must be used and not private one. This is very often preventing ARP spoofing but not always, depends on how it is used, sometimes it's easy to defeat.
• Some networks have MAC learning and do not allow spoofing (e.g. allow only specific MAC on single port), this is quite rare but existent. So this works by monitoring the switches and blocking attackers.
• Some networks might require you to supply you MAC which is configured for the port, and this way it can also prevent from sending malicious ARP requests / responses
• Depending on switch vendor there might be other features helping with ARP spoofing, usually at Layer 2 switch like Dynamic ARP Inspection.
• It is quite easy to make switch policy so that each customer port can exchange packets only with router port without need of LAN Isolation feature, however not many people do it

It depends on the class of the switch, for example:

• Wifi routers and home routers have LAN Isolation, however this one is usually disabled by default
• Layer 2/3 campus class switches usually have ARP filtering, but if it's not enabled than you can spoof MAC or IP address from different VLAN (you can use same MAC or different one for any IP address). The one I mean here is the one implemented at the Layer 3 gateway.
• Some new campus like switches (as of 2016) have LAN Isolation built-in as well, however it's not enabled by default, which helps with ARP spoofing
• Some networks require IEEE 802.1X authentication to connect to the port, usually corporate equipment must be used and not private one. This is very often preventing ARP spoofing but not always, depends on how it is used, sometimes it's easy to defeat.
• Some networks have MAC learning and do not allow spoofing (e.g. allow only specific MAC on single port), this is quite rare but existent. So this works by monitoring the switches and blocking attackers.
• Some networks might require you to supply you MAC which is configured for the port, and this way it can also prevent from sending malicious ARP requests / responses
• Depending on switch vendor there might be other features helping with ARP spoofing, usually at Layer 2 switch like Dynamic ARP Inspection.
• It is quite easy to make switch policy so that each customer port can exchange packets only with router port without need of LAN Isolation feature, however not many people do it

It depends on the class of the switch, for example:

• Wifi routers and home routers have LAN Isolation, however this one is usually disabled by default
• Layer 2/3 campus class switches usually have ARP filtering, but if it's not enabled than you can spoof MAC or IP address from different VLAN (you can use same MAC or different one for any IP address). The one I mean here is the one implemented at the Layer 3 gateway.
• Some new campus like switches (as of 2016) have LAN Isolation built-in as well, however it's not enabled by default, which helps with ARP spoofing
• Some networks require IEEE 802.1X authentication to connect to the port, usually corporate equipment must be used and not private one. This is very often preventing ARP spoofing but not always, depends on how it is used, sometimes it's easy to defeat.
• Some networks have MAC learning and do not allow spoofing (e.g. allow only specific MAC on single port), this is quite rare but existent. So this works by monitoring the switches and blocking attackers.
• Some networks might require you to supply you MAC which is configured for the port, and this way it can also prevent from sending malicious ARP requests / responses
• Depending on switch vendor there might be other features helping with ARP spoofing, usually at Layer 2 switch like Dynamic ARP Inspection.
• It is quite easy to make switch policy so that each customer port can exchange packets only with router port by tagging each packet. This makes ARP spoofing also very hard.

It depends on the class of the switch, for example:

• Wifi routers and home routers have LAN Isolation, however this one is usually disabled by default
• Layer 2/3 campus class switches usually have ARP filtering, but if it's not enabled than you can spoof MAC or IP address from different VLAN (you can use same MAC or different one for any IP address). The one I mean here is the one implemented at the Layer 3 gateway.
• Some new campus like switches (as of 2016) have LAN Isolation built-in as well, however it's not enabled by default, which helps with ARP spoofing
• Some networks require IEEE 802.1X authentication to connect to the port, usually corporate equipment must be used and not private one. This is very often preventing ARP spoofing but not always, depends on how it is used, sometimes it's easy to defeat.
• Some networks have MAC learning and do not allow spoofing (e.g. allow only specific MAC on single port), this is quite rare but existent. So this works by monitoring the switches and blocking attackers.
• Some networks might require you to supply you MAC which is configured for the port, and this way it can also prevent from sending malicious ARP requests / responses
• Depending on switch vendor there might be other features helping with ARP spoofing, usually at Layer 2 switch like Dynamic ARP Inspection.
• It is quite easy to make switch policy so that each customer port can exchange packets only with router port without need of LAN Isolation feature, however not many people do it

It depends on the class of the switch, for example:

• Wifi routers and home routers have LAN Isolation, however this one is usually disabled by default
• Layer 2/3 campus class switches usually have ARP filtering, but if it's not enabled than you can spoof MAC or IP address from different VLAN (you can use same MAC or different one for any IP address).
• Some new campus like switches (as of 2016) have LAN Isolation built-in as well, however it's not enabled by default
• Some networks require IEEE 802.1X authentication to connect to the port, usually corporate equipment must be used and not private one
• Some networks have MAC learning and do not allow spoofing (e.g. allow only specific MAC on single port), this is quite rare but existent. So this works by monitoring the switches and blocking attackers.

Note that LAN Isolation does not always prevent spoofing, but it makes a lot harder and the gains from doing so are usually much smaller.

It depends on the class of the switch, for example:

• Wifi routers and home routers have LAN Isolation, however this one is usually disabled by default
• Layer 2/3 campus class switches usually have ARP filtering, but if it's not enabled than you can spoof MAC or IP address from different VLAN (you can use same MAC or different one for any IP address). The one I mean here is the one implemented at the Layer 3 gateway.
• Some new campus like switches (as of 2016) have LAN Isolation built-in as well, however it's not enabled by default, which helps with ARP spoofing
• Some networks require IEEE 802.1X authentication to connect to the port, usually corporate equipment must be used and not private one. This is very often preventing ARP spoofing but not always, depends on how it is used, sometimes it's easy to defeat.
• Some networks have MAC learning and do not allow spoofing (e.g. allow only specific MAC on single port), this is quite rare but existent. So this works by monitoring the switches and blocking attackers.
• Some networks might require you to supply you MAC which is configured for the port, and this way it can also prevent from sending malicious ARP requests / responses
• Depending on switch vendor there might be other features helping with ARP spoofing, usually at Layer 2 switch like Dynamic ARP Inspection.
• It is quite easy to make switch policy so that each customer port can exchange packets only with router port by tagging each packet. This makes ARP spoofing also very hard.