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

单项选择题WhichofthefollowingistrueabouttheMPLSheaderanditsEXPfieldsize？（）

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WhichtwostatementsaretrueaboutRED？（）

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.

单项选择题WhatisthecommandtoconfigureRSVPtoreserveuptoone-tenthofaGigabitlink，butonlyalloweachindividualflowtouse1MB s？（）

A.ip rsvp bandwidth 100000 1000
B.ip rsvp bandwidth 100000 1
C.ip rsvp bandwidth 10 1
D.ip rsvp bandwidth 1000000 1000

多项选择题WhichthreeprotocolsorapplicationsshouldbeplacedinaclassthatisconfiguredwithWRED？（）

A.HTTP
B.RTP
C.streaming video
D.BitTorrent
E.POP3

单项选择题InGLBP，whichrouterwillansweronclientARPrequests？（）

A.all active AVF routers as the first response is used by the client
B.the AVG router，replying with a different AVF MAC address each time
C.a random AVF router，based on a GLBP seed hash key
D.only the AVG router that received the ARP request first