單項(xiàng)選擇題Which of the following technologies can improve convergence time following a link failure in a serviceprovider network?()

A.MPLS TE FR
B.MPLS VPN
C.BFD
D.RSVP
E.VPLS
F.SNMP


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3.多項(xiàng)選擇題SONET’s three layers are().

A.Section
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4.單項(xiàng)選擇題Which of the following descriptions about IP spoofing is correct?()

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