Question

For IPv6 addressing: 
A. It has 128-bit address space 
B. It supports multicasting 
C. It provides built-in IPsec support 
D. It has a 32-bit address structure 
Choose the correct answer from the options given below:

• A. A, B and C only
• B. C and D only
• C. A and D only
• D. B and C only

Hint:

IPv6 = 128-bit addressing + built-in security (IPsec) + no broadcast (uses multicast).

Answer 1

The Correct Option is A

Concept: IPv6 (Internet Protocol version 6) is the latest version of the Internet Protocol designed to overcome the limitations of IPv4. It introduces a much larger address space and enhanced features such as improved security and efficient routing.

Step 1: Analyze Statement A A. It has 128-bit address space IPv6 uses 128-bit addresses, which allows a massive number of unique IP addresses: \[ 2^{128} \text{ addresses} \] This is significantly larger than IPv4 (which uses 32-bit addressing). \[ \Rightarrow \text{Statement A is TRUE} \]

Step 2: Analyze Statement B B. It supports multicasting IPv6 fully supports multicasting, which allows sending data to multiple destinations efficiently. In fact, IPv6 eliminates broadcast and relies more on multicast and anycast. \[ \Rightarrow \text{Statement B is TRUE} \]

Step 3: Analyze Statement C C. It provides built-in IPsec support IPv6 was designed with security in mind and includes IPsec (Internet Protocol Security) as a fundamental component for encryption and authentication. \[ \Rightarrow \text{Statement C is TRUE} \]

Step 4: Analyze Statement D D. It has a 32-bit address structure This is incorrect because 32-bit addressing belongs to IPv4, not IPv6. \[ \Rightarrow \text{Statement D is FALSE} \]

Step 5: Final conclusion True statements are A, B, and C only. \[ \therefore \text{Correct answer is (A) A, B and C only} \]