Which two statements are correct in a comparison of IPv4 and IPv6 packet headers? (Choose two.)
- The Source Address field name from IPv4 is kept in IPv6.
- The Destination Address field is new in IPv6.
- The Version field from IPv4 is not kept in IPv6.
- The Time-to-Live field from IPv4 has been replaced by the Hop Limit field in IPv6.
- The Header Checksum field name from IPv4 is kept in IPv6.
| Answers Explanation & Hints:
The IPv6 packet header fields are as follows: Version, Traffic Class, Flow Label, Payload Length, Next Header, Hop Limit, Source Address, and Destination Address. The IPv4 packet header fields include the following: Version, Differentiated Services, Time-to-Live, Protocol, Source IP Address, and Destination IP Address. Both versions have a 4-bit Version field. Both versions have a Source (IP) Address field. IPv4 addresses are 32 bits; IPv6 addresses are 128 bits. The Time-to-Live or TTL field in IPv4 is now called Hop Limit in IPv6, but this field serves the same purpose in both versions. The value in this 8-bit field decrements each time a packet passes through any router. When this value is 0, the packet is discarded and is not forwarded to any other router. |