單項選擇題How many messages does Internet Key Exchange use to negotiate SA characteristic when it runs inaggressive mode？（）

A.3
B.4
C.5
D.2
E.6


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1.單項選擇題Which statement about SNMP is true？（）

A.SNMP version 2 uses a proxy agent to forward GetNext message to SNMP version 3.
B.SNMP version 2 supports message integrity to ensure that a packet has not been tampered with
C.Proxy agents were used only in SNMP version 1.
D.SNMP version 3 supports encryption and SNMP version 2 support authentication.
E.GetBulk messages are converted to GetNext messages by the proxy agent and are then forwarded to the SNMP version 1 agent.

2.多項選擇題In relation to MPLS Multicast VPN， which three statements about multicast distribution （MDT） groups aretrue？ （）

A.Default MDT groups are used for PIM control traffic， low-bandwidth sources， and flooding of sparse mode traffic.
B.MDTs are built in customer networks
C.Data MDT groups are used for high-bandwidth sources to reduce replication to uninterested PEs.
D.MDTs are built in provider networks
E.The number of MDTs depends on PIM modes of MDT groups.

3.單項選擇題Which type of AAL does ATM utilize to deliver CBR traffic？（）

A.AAL2
B.AAL 4
C.AL 5
D.AAL 1
E.AAL 3

4.多項選擇題Which two models are the models of DiffServ-Aware Traffic Engineering？ （）

A.Policy-based Model
B.Class based Model
C.Russian Doll Model
D.Global Tunnel Model
E.Maximum Allocation Model

5.多項選擇題Which three are optional extensions of the Frame Relay Local Management Interface specification？（）

A.switched virtual circuit
B.virtual circuit status
C.simple flow control
D.multicasting
E.permanent virtual circuit