Which of the following is not a step in the Header translation procedure?

Correct option is C

The header translation procedure occurs when an IPv6 packet is translated into an IPv4 packet. This is required for networks where both IPv4 and IPv6 co-exist and need to communicate. However, certain fields in IPv6 do not have a direct equivalent in IPv4, so they are either discarded or converted appropriately.
Important Key Points:
Steps in IPv6-to-IPv4 Header Translation:
1. IPv6 address conversion: The last 32 bits of an IPv6-mapped address are used to derive an IPv4 address. ✅ (Step performed, so option (a) is true)
2. IPv6 priority field is discarded: IPv6 has a Traffic Class field (formerly called Priority), which does not exist in IPv4 and is discarded. ✅ (Step performed, so option (b) is true)
3. IPv6 Flow Label is NOT considered: The flow label is unique to IPv6 and is not used in IPv4. ❌ (Not a valid step, so option (c) is false and is the correct answer to the question)
Knowledge Booster:
· IPv6 headers have 40 bytes, whereas IPv4 headers have 20 bytes.
· Header translation is necessary because IPv6 and IPv4 are not directly compatible.
· NAT64 and DNS64 are common mechanisms used for IPv6-to-IPv4 communication.