Question: In a Layer 3 message, when a field spans multiple octets, how are the bit values ordered as the octet number increases?
Option 1: The order of bit values progressively **increases** as the octet number increases.
Option 2: The order of bit values progressively **decreases** as the octet number increases.
Option 3: The ordering remains constant, with no change in bit value sequence across octets.
Option 4: It depends on the specific information element within the message.
Explanation: When a field extends over more than one octet, the order of bit values progressively decreases as the octet number increases. This is crucial for correctly interpreting multi-octet fields in Layer 3 messages, ensuring proper decoding of information elements within the protocol.