The MTU (Maximum Transfer Unit) specifies the maximum transmission unit size of an interface, and is usually determined by negotiation at the link layer of the driver.
The upper level protocols normally optimize pack size for each medium.
If a network adapter driver uses LAN emulation mode, it may report a higher MTU than expected, which Windows will use.
| Windows XP | | | Windows NT / Windows 2000 | |
| Network | MTU (bytes) | | | MTU (bytes) |
| 16 Mbps Token Ring | 17914 | | | 17914 |
| 4 Mbits/Sec Token Ring | 4464 | | | 4464 |
| FDDI | 4352 | | | 4352 |
| Ethernet | 1500 | | | 1500 |
| IEEE 802.3/802.2 | 1492 | | | 1492 |
| X.25 | 576 | | | 576 |
| PPPoE (WAN Miniport) | 1480 | | | N/A |
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