ccna cost of test

ccna cost of test.M bit 0 bit Meaning Description0 0 Should be used in environments without a DHCPV6 server. The host uses the prefix in the RA message to create an IPv6 unicast address while setting up other information such as DNS using manual configuration methods; this application is called stateless address autoconfiguration (SLAAC)0 1 The host uses the IPv6 prefix obtained from the RA message to create an IPv6 address while using DHCPv6 to obtain other network configuration parameters other than the IPv6 address / prefix; this application is referred to as stateless DHCPv61 0 The host only uses DHCPv6 to obtain the IPv6 address/prefix, other network configuration parameters are not obtained through DHCPv6, this combination has no practical meaning and is not recommended1 1 The host uses DHCPv6 to configure IPv6 unicast addresses/prefixes and other network configuration parameters such as DNS, domain names, etc. This application is called stateful DHCPv610.2.2 Stateless DHCPV6The SLAAC method can only enable the client to obtain IPv6 address/prefix and gateway information, other information such as DNS, domain name, etc. cannot be obtained, but the DHCPv6 server can provide these network configuration parameters, this process is called stateless DHCPv6, in this method, the M bit of the Flag field in the RA message is 0 and the O bit is 1. Stateless DHCPv6 The working process is described below.1 Before an IPv6 address is assigned, after the DHCPv6 client generates a link-local address and the DAD passes, it sends an RS message with the link-local address of its own NIC as the source and the FF02::2 multicast address as the destination to notify the local IPv6 router that it needs an RA.2 A router with unicast routing enabled receives an RS message and immediately responds by sending an RA (M=0, 0=1) message with the link-local address of its own interface as the source and the FF02::l multicast address as the destination.3 A DHCPv6 client receives an RA message with M=0,0=1, which means that the DHCPv6 client obtains network configuration parameters through the DHCPv6 stateless method. The DHCPv6 client uses the prefix and prefix length in the RA message and the interface ID generated using the EUI-64 method or randomly to create its IPv6 global unicast address and DAD by sending NS.