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ccna certification houston.2018:0003:0000:0000 02bb:00ff:0000:2019Figure 2.7 IPv6 Address Structure2018:00D3:0000:0000:02BB:00FF:0000:2019 is a complete IPv6 address. The above example shows the difficulty of managing IPv6 addresses manually, and the need for automatic configuration and DNS. But the following rules can simplify the representation of IPv6 addresses.The leading zero bits in each 16-bit grouping in an IPv6 address can be removed for simplified representation. Adjacent consecutive zero bits in a colon separated hexadecimal format can be combined and represented by a double colon "::", but "can only appear once in an IPv6 address. With the two rules above, the above IPv6 address can be simplified to 2018:D3::2BB:FF:0:2019oChapter 2 IP Addresses .17 .The basic packet header length of an IPv6 packet is fixed at 40 bytes and its format is shown in Figure 2-8. the meaning of each field is described below.Figure 2-8 Basic Packet Header Format for IPv6 Packets1 Version (4 bits): For IPv6, the value of this field is 6.2 Flow Type (8 bits): This field marks an IPv6 packet with a DSCP (DifferentiatedServicesCodePoint), which indicates how the packet should be handled to provide QoS services.(§) Stream Label (20 bits): This field is new in the IPv6 protocol and is used to label a stream of IPv6 data, allowing the router or switch to process the data based on the stream rather than the packet, this field can also be used for QoS.