IPv6 Comparison with IPv4 Best CCNA Training Center in New Delhi-

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This section provides a summary comparison of IPv6 to IPv4. Become knowledgeable about the characteristics summarized in Table 8-5. The use of 128 bits over 32 bits is an obvious change. The upper-layer protocol is identified with the next header field in IPv6, which was the protocol type field used in IPv4. ARP is replaced by IPv6 ND.

Table 8-5. IPv6 and IPv4 Characteristics

Characteristic	IPv6	IPv4
Address length	128 bits	32 bits
Address representation	Hexadecimal	Dotted-decimal
Header length	Fixed (40 bytes)	Variable
Upper-layer protocols	Next header field	Protocol type field
Link address resolution	ND	ARP
Address configuration	Stateless autoconfiguration or stateful DHCP	Stateful DHCP
DNS (name-to-address resolution)	A6 records	A records
Interior routing protocols	EIGRPv6, OSPFv3, RIPng, IS-IS for IPv6	EIGRP, OSPFv2, RIPv2, IS-IS
Classification and marking	Traffic class and flow label fields, Differentiated Services Code Point (DSCP)	IP precedence bits, type-of-service field, DSCP
Private addresses	Site-local addresses	RFC 1918 private address space
Fragmentation	Sending host only	Sending host and intermediate routers
Loopback address	0:0:0:0:0:0:0:1	127.0.0.1
Address types	Unicast, anycast, multicast	Unicast, multicast, broadcast