When configured. MPLS can increase routing redundancy by providing which of the following network topology types?（）
Which two of these are characteristics of MPLS VPNs?()A. Layer 3 MPLS VPNs can forward only IP packetsB. Layer 2 MPLS VPNs can forward any network protocolC. MPLS label paths are automatically formed based on Layer 2 framesD. Layer 3 MPLS VPNs can forward any network protocol based on Layer 2 framesE. In Layer 2 MPLS VPNS, the service provider controls the customer Layer 3 policies
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Why is it appropriate to use conditional label advertising when deploying MPLS? （）A、to make CEF tables smallerB、to enable label switching on the frame mode interfaceC、to restrict MPLS availability to predefined time periodsD、to restrict label switching to a limited number of networksE、to restrict end users from seeing the routers in the MPLS network
Which of the following statements regarding ISDN are correct?（）A、Each ISDN B channel has transmission speeds of up to 64 kbps.B、The ISDN B channel can carry video, voice or data.C、The ISDN B channel transmission rate varies depending on the service used.D、The ISDN D channel transmits control information.E、The ISDN B channels can be configured with different subnets and encapsulation types when dialer profiles are configured.
When an MPLS Layer 2 VPN runs in the hub-and-spoke model， where is QoS implemented？（）A、hub and spokeB、PEC、CED、hubE、spoke
In the context of MPLS，what is the correct action to be performed when an aggregate label is received ？（）A、It adds the VPN label into the top label in the MPLS label stackB、It replaces the top label in the MPLS label stack with a VPN label and propagatesC、It replaces the bottom label in the MPLS label stack with a VPN label and propagatesD、It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packetsE、None of above
Using more than one label on a single packet is required in what context？（）A、MPLS TEB、MPLS VPNC、When CEF switching and Label switching is doneD、In all the above circumstances
Which three functions can CCC be used for？（）A、To interconnect VLANSB、To interconnect ATM VCsC、To interconnect MPLS LSPsD、To interconnect MPLS VPNs
