10790840
| Question | Answer |
| What is the 4th field of an Ethernet frame? | Ethertype |
| What does the EtherType field do? | Identifies the upper layer protocol encapsulated in the Data field |
| What is the EtherType hex code for IPv4? | 0x800 (or 0x0800) |
| What is the EtherType hex code for IPv6? | 0x86DD |
| What is the EtherType hex code for ARP? | 0x806 (or 0x0806) |
| How many bytes can the Data field contain? | 46 - 1500 bytes |
| What does FCS stand for? | Frame Check Sequence |
| How many bytes is a MAC address? | 6 bytes |
| How many bytes is the Preamble field? | 8 bytes |
| What is the last byte of the Preamble field? | SFD or Start Frame Delimiter |
| How many bytes is the FCS? | 4 bytes |
| How does the FCS detect errors in a frame? | The FCS field includes the results of a CRC from the sending device. When the receiving device receives the frame it generates a CRC and compares the results to make sure they match. |
| What does CRC stand for? | cyclic redundancy check |
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