Maximum Hop Limit Value 255 | Generated by AI
Question: In IPv6, what is the maximum value of the “Hop Limit” field?
Answer: C. 255
Explanation
- Field Size: The Hop Limit field in the IPv6 header is 8 bits (1 byte) long.
- Maximum Value: An 8-bit field can represent $2^8 = 256$ total values, ranging from 0 to 255. Therefore, the maximum numerical value that can be stored in this field is 255.
- Purpose: Each router that forwards the IPv6 packet decrements the Hop Limit value by 1. If the value reaches 0, the packet is discarded, preventing it from looping indefinitely in the network.
Note on the question text: The textbook explanation provided in your snippet mentions “长度为8B” (length is 8 Bytes). This is a typo commonly found in some exam prep materials. It should state 8 bits (1 Byte), not 8 Bytes.
Generated by AI. Curating and sharing still takes effort.
If you find it useful, feel free to
donate.
WeChat: @lzwjava
·
X: @lzwjava ·
Say hi 👋