Unlike IPv4, IPv6 does not include which of the following fields in its base header?

Correct option is D

IPv6 simplifies its base header compared to IPv4 by removing certain fields that were present in the IPv4 header. These fields include:
1. Fragmentation Offset: Fragmentation is handled differently in IPv6, and fragmentation-related fields are removed from the base header.
2. Header Checksum: IPv6 eliminates the checksum to improve processing speed, as checksum verification is performed at the link layer and transport layer.
3. Options: IPv6 handles options using extension headers, not in the base header.
Important Key Points:
1. IPv6's base header has a fixed size of 40 bytes, simplifying processing.
2. IPv4 includes 13 fields in its header, while IPv6 reduces this to 8 fields, removing unnecessary fields for efficiency.
3. The removed fields are relocated or managed differently, such as via extension headers.