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

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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.

多项选择题

Which two statements are true about RED？（）

A.RED randomly drops packets before the queue becomes full.
B.RED is always useful，without dependency on flow.
C.RED increases the drop rate as the average queue size increases.
D.RED has a per-flow intelligence.