多项选择题

Which three are the ATM cell header fields？（）

A.cell loss priority （CLP）
B.discard eligibility （DE）
C.head error control （HEC）
D.generic flow control （GFC）
E.forward explicit congestion notification （FECN）

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多项选择题

When you design QoS on CE for an MPLS Layer 2 VPN， which three things should be considered？（）

A.Layer 2 access link QoS design
B.enterprise-to-service-provider mapping models
C.Layer 3 link access QoS design
D.service provider service level agreements
E.Layer 2 link access load balancing

单项选择题

Which description of BGP authentication is true？（）

A.MD5 has been used by BGP to encrypt BGP update packets.
B.BGP uses a message-digest algorithm to authenticate BGP peers
C.A plain-text password authentication is an option of BGP authentication
D.EBGP peers authentication is faster than IBGP peers authentication
E.BGP uses public key and private key to authenticate BGP peers.

单项选择题

What is the typical marked DSCP value for a voice signaling packet in VoIP technology？（）

A.BE
B.AF41
C.AF21
D.EF
E.AF31