Which field in an IPv4 packet header is decremented by exactly 1 by each router it passes through to prevent the packet from looping endlessly?

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A Total Length
B Time to Live (TTL)
C Header Checksum
D Identification

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Answer: B. Time to Live (TTL)

• Answer: B) Time to Live (TTL)
• Explanation: TTL prevents infinite routing loops. When TTL reaches 0, the packet is dropped, and an ICMP error message is sent back to the source.

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Which field in an IPv4 packet header is decremented by exactly 1 by each router it passes through to prevent the packet from looping endlessly?

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