IPv6 Header Field Equivalent to TTL | Cisco Certified Network Associate Exam | Cisco Provider

TTL Equivalent in IPv6 Header Field

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Which IPv6 header field is equivalent to the TTL?



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The IPv6 header field equivalent to the Time-to-Live (TTL) in IPv4 is the Hop Limit.

The Hop Limit field in an IPv6 header specifies the maximum number of routers (hops) that a packet is allowed to travel before being discarded. When a router forwards an IPv6 packet, it decrements the Hop Limit value by 1. If the Hop Limit reaches 0, the packet is discarded and an ICMPv6 Time Exceeded message is sent back to the source of the packet.

Unlike the TTL field in IPv4, which is an 8-bit field, the Hop Limit field in IPv6 is a 1-byte (8-bit) field. The use of a larger field in IPv6 allows for a larger maximum value, which can help prevent routing loops and ensure more efficient routing of packets.

Flow Label is an IPv6 header field used to identify a specific flow of packets between a source and a destination, for specialized processing by routers or other devices. TTD (Time to Die) is not a valid IPv6 header field. Hop Count is a term that can be used to refer to the number of hops taken by a packet in a network, but it is not an IPv6 header field. Scan Timer is also not a valid IPv6 header field.