Читать книгу CCNP Enterprise Certification Study Guide: Implementing and Operating Cisco Enterprise Network Core Technologies - Ben Piper, David Higby Clinton - Страница 33

Another interesting side effect we inherited from the use of the legendary thick yellow cable is that Ethernet had to impose a limit on the maximum frame size to keep a single node from hogging the medium with colossal frames. The Ethernet maximum transmission unit (MTU) defines the maximum size of the Data field in bytes. DIX and IEEE 802.3 support a maximum MTU of 1,500 bytes. Higher-layer protocols trying to send packets larger than the MTU must break apart their packets into fragments that will fit into the frame's Data field. To avoid fragmentation, some interfaces support jumbo frames with an interface MTU of 9,000 bytes to 9,216 bytes.