单选题What is the label for MPLS over ATM？（）A VPI 16B DLCIC VPI and VCID circuit numberE PVC and SVC

第1题：

Which two Any Transport over MPLS （AToM） traffic encapsulations require the use of a control word？（）

• A、HDLC
• B、ATM AAL5
• C、PPP
• D、Ethernet VLAN
• E、Frame Relay

第2题：

Which statement about ATM AAL5 over MPLS is true？（）

• A、It supports ATM signaling.
• B、It supports traffic shaping of packets in MPLS to the ATM path.
• C、It supports ATM switched virtual circuits
• D、It supports fragmentation and reassembly.
• E、It supports AAL5 SDU switching

第3题：

Why is it appropriate to use conditional label advertising when deploying MPLS? （）

• A、to make CEF tables smaller
• B、to enable label switching on the frame mode interface
• C、to restrict MPLS availability to predefined time periods
• D、to restrict label switching to a limited number of networks
• E、to restrict end users from seeing the routers in the MPLS network

第4题：

Using more than one label on a single packet is required in what context？（）

• A、MPLS TE
• B、MPLS VPN
• C、When CEF switching and Label switching is done
• D、In all the above circumstances

第5题：

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 stack
• B、It replaces the top label in the MPLS label stack with a VPN label and propagates
• C、It replaces the bottom label in the MPLS label stack with a VPN label and propagates
• D、It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packets
• E、None of above

第6题：

What is the label for MPLS over ATM？（）

• A、VPI 16
• B、DLCI
• C、VPI and VCI
• D、circuit number
• E、PVC and SVC

第7题：

What are the four fields in an MPLS label？（）

• A、version
• B、experimental
• C、label
• D、protocol
• E、TTL
• F、bottom-of-stack indicato

第8题：

There is MPLS VPN traffic traversing through a TE intermediate router. What is the MPLS packet labelstack sequence （from outer to inner） for the VPN traffic on this router？（）

• A、TE label， IGP label， VPN label
• B、IGP label， TE label， VPN label
• C、TE label， VPN label， IGP label
• D、VPN label， IGP label， TE label
• E、IGP label， VPN label， TE label

第9题：

As a network administrator, you are required to deploy MPLS technology. During the deployment, it is recommended to apply conditional label advertising. What is most probably the reason for that?（）

• A、to enable label switching on the frame mode interface
• B、to restrict MPLS availability to predefined time periods
• C、to restrict end users from seeing the routers in the MPLS network
• D、to restrict label switching to a limited number of networks

第10题：

What is the action of "pop" in the context of MPLS switching？（）

• A、It removes the top label in the MPLS label stack.
• B、It adds a top label in MPLS label stack.
• C、It replaces the top label in the MPLS label stack with another value.
• D、It replaces the top label in the MPLS label stack with a set of labels.
• E、None of above.