alleryIPv6 was proposed mainly because IPv4:
ACould not be written down in hexadecimal notation
BWas far too slow to route packets across the web
COffers only about 4.3 billion unique addresses
DCould not be used together with domain names
Answer & Solution
Correct answer: C. Offers only about 4.3 billion unique addresses
1. IPv4 uses 32 bits, which limits the total number of distinct addresses.
2. That 32-bit space offers just under 4.3 billion unique addresses.
3. With more and more devices connecting, it was realised this would not be sufficient.
4. A 128 bit address, IP version 6, was therefore proposed.
5. Speed, notation and domain names are unrelated to the change, so the other options are traps.
_Source: syllabus Computer Science Class 12, Ch 10 'Computer Networks', S10.6.2 IP Address_
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