Which two are features of IPv6?（）

单项选择题What is the difference between a CSU DSU and a modem？（）

A.A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.
B.A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.
C.A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.
D.A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.

单项选择题Refer to the exhibit. What is the most appropriate summarization for these routes?（）

A.10.0.0.0/21
B.10.0.0.0/22
C.10.0.0.0/23
D.10.0.0.0/24

单项选择题Refer to the exhibit. Which subnet mask will place all hosts on Network B in the same subnet with the least amount of wasted addresses?（）

A.255.255.255.0
B.255.255.254.0
C.255.255.252.0
D.255.255.248.0

单项选择题What is the first 24 bits in a MAC address called?（）

A. NIC
B. BIA
C. OUI
D. VAI

单项选择题What is known as one-to-nearest addressing in IPv6?（）

A.global unicast
B.anycast
C.multicast
D.unspecified address