多项选择题

Choose two commands that are required to enable multicast on a router， when it is known that thereceivers use a specific functionality of IGMPv3.（）

A.ip pim rp-address
B.ip pim ssm
C.ip pim sparse-mode
D.ip pim passive

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单项选择题

What is also called Type 0 authentication in OSPF on Cisco Routers？（）

A.MD5
B.There is no Type 0 authentication
C.SHA1
D.Null

单项选择题

Which protocol and port have been assigned by IANA for RADIUS authentication？（）

A.UDP/1812
B.UDP/1813
C.TCP/1812
D.TCP/1813

单项选择题

Which of the following is true about the MPLS header and its EXP field size？（）

A.The MPLS header is 2 bytes，and the EXP field is 3 bits long.
B.The MPLS header is 1 byte，and the EXP field is 3 bits long.
C.The MPLS header is 4 bytes，and the EXP field is 3 bits long.
D.The MPLS header is 3 bytes，and the EXP field is 3 bits long.