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Which field in the DHCP packet structure indicates whether the packet is a request or a response?
File
XID
Opcode
SName
The "op" field known as the "OpCode" identifies the DHCP packet as a request or reply; e.g., 1=BOOTREQUEST, 2=BOOTREPLY. "SName" refers to the DHCP server host name which is optional. XID refers to the Transaction ID which is a random number chosen by the client. The "file" is the boot file name within the DHCP packet. For more information, refer to https://www.cisco.com/c/en/us/support/docs/ip/dynamic-address-allocation-resolution/27470-100.html
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