单项选择题 An enterprise h as plans to start adding IPv6 support. For the first year, the IPv6 will be in small pockets spread around the existing large IPv4 network, with occasional IPv6 traffic while applications teams test IPv6 - enabled servers and applications. Which of the fol lowing tools would be most appropriate?（）

单项选择题 Router R1 has been conf igured with an ipv6 route 2000::/64 S0/0/0 64 command.Which of the following does the 64 at the end of the command represent?（）

单项选择题 The following output occurs on Router R1 , which runs both EIGRP for IPv6 and OSPFv3, with redistribution from EIGRP into OSPF configured with the redistribute eigrp 1 metric 25 command. Interface S0/0/1 has been enabled for EIGRP ASN 1. Which of the following should be true of redistribution in this case?（） D 2000::/64 [90/1422516] via FE80::213:19FF:FE7B:5026, Serial0/0/ 1 C 2000:0:0:1::/64 [0/0] via Serial0/0/1, directly connected L 2000::1:213:19FF:FE7B:5004/128 [0/0] via Serial0/0/1, receive