ARP messages are sent using which Ethertype designation in the frame header?“0x0806.”

ARP messages are sent using which Ethertype designation in the frame header?“0x0806.”
- source cisco

Which one of the following options is a valid field in the UDP header?"checksum."

Which one of the following options describes the three steps in the TCP three-way handshake?
1. SYN; 2. SYN, ACK; 3. ACK."

the following fields are found in a TCP segment?
source port," "window size," and "checksum