O LEVEL- INTERNET TECHNOLOGY & WEB DESIGN

O LEVEL-PAPER 2nd -- M2-R4 :

INTERNET TECHNOLOGY & WEB DESIGN

THESE ARE THE QUESTIONS WHICH FREQUENTLY ASKED IN 

  LAST 10 YEARS -----

 Differences Between IPv4 and IPv6

BASIS OF COMPARISON	IPV4	IPV6
Address Configuration	Supports Manual and DHCP configuration.	Supports Auto-configuration and renumbering
End-to-end connection integrity	Unachievable	Achievable
Address Space	It can generate 4.29 x 109 addresses.	It can produce quite a large number of addresses, i.e., 3.4 x 1038.
Security features	Security is dependent on application	IPSEC is inbuilt in the IPv6 protocol
Address length	32 bits (4 bytes)	128 bits (16 bytes)
Address Representation	In decimal	In hexadecimal
Fragmentation performed by	Sender and forwarding routers	Only by the sender
Packet flow identification	Not available	Available and uses flow label field in the header
Checksum Field	Available	Not available
Message Transmission Scheme	Broadcasting	Multicasting and Anycasting
Encryption and Authentication	Not Provided	Provided

Key Differences Between IPv4 and IPv6

1.   IPv4 has 32-bit address length whereas IPv6 has 128-bit address length.

2.   IPv4 addresses represent the binary numbers in decimals. On the other hand, IPv6 addresses express binary numbers in hexadecimal.

3.   IPv6 uses end-to-end fragmentation while IPv4 requires an intermediate router to fragment any datagram that is too large.

4.   Header length of IPv4 is 20 bytes. In contrast, header length of IPv6 is 40 bytes.

5.   IPv4 uses checksum field in the header format for handling error checking. On the contrary, IPv6 removes the header checksum field.

6.   In IPv4, the base header does not contain a field for header length, and 16-bit payload length field replaces it in the IPv6 header.

7.   The option fields in IPv4 are employed as extension headers in IPv6.

8.   The Time to live field in IPv4 refers to as Hop limit in IPv6.

9.   The header length field which is present in IPv4 is eliminated in IPv6 because the length of the header is fixed in this version.

10.   IPv4 uses broadcasting to transmit the packets to the destination computers while IPv6 uses multicasting and anycasting.

11.   IPv6 provides authenticatio cryption, but IPv4 doesn’t provide it.n and en