You are about to design a very fast convergence time on a service provider network. Which feature wouldyou utilize to declare a link failure within less than two seconds of the fault on a link？（）

多项选择题Whichthreeofthesecanbeaforwardingequivalenceclass？（）

A.IPsec tunnel
B.routing equivalence paths
C.traffic engineering tunnel
D.bridge or switch instance
E.groups of IP addresses

单项选择题HowmanybitsdoesEXPoccupyintheMPLSlabelheader？（）

A.8
B.4
C.3
D.1
E.2

单项选择题WhatistheminimumhardwareconfigurationofthemultishelfCiscoCRS-1system？（）

A.one route processor （RP） Card and one modular services card （MSC）
B.one distributed route processor （DRP） and one S13 fabric card （SFC）
C.one line card chassis （LCC） and one fabric card chassis （FCC）
D.one route processor （RP） and one fabric card chassis （FCC）
E.one line card chassis （LCC） and one S13 fabric card （SFC）

单项选择题WhatistheportnumberofanIPsecEncapsulatingSecurityPayfoadpacket？（）

A.UOP port 50
B.IP protocol 51
C.TCP port 51
D.TCP port 50
E.IP protocol 50
F.UDP port51

单项选择题WhatistheencapsulationformatofanMPLSMulticastVPN（MVPN）packer？（）

A.IP unicast in IP unicast
B.IP multicast in IP anycast
C.IP anycast in IP anycast
D.IP multicast in IP unicast
E.IP multicast in IP multicast
F.IP unicast in IP multicast