思科认证考试
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
题目
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
相似问题和答案
第1题：
MPLS标签（Label）长度为（）。
正确答案:4byte
第2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
正确答案:D
第3题：
A.Label Data Pair
B.Label Distribution Pair
C.Label Distribution Protocol
D.Label Data Protocol
第4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
正确答案:B,C,E,F
第5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
正确答案:A
第6题：
在MPLS中，LSP的具体解释（）。
- A、Label Selection Pair
- B、Label Switched Path
- C、Lightweight Signaling Protocol
- D、Large Sampling Path
正确答案:B
第7题：
Which 4 statements regarding MPLS Label Stack Encoding is true？（）
- A、A value of 4 represents the "Implicit NULL Label."
- B、A value of 0 represents the "IPv4 Explicit NULL Label."
- C、A value of 1 represents the "Router Alert Label". The use of this label is analogous to the use of the"Router Alert Option" in IP packets （for example， ping with record route option）
- D、A value of 2 represents the "IPv6 Explicit NULL Label"
- E、A value of 1 represents the "IPv1 Explicit NULL Label"
- F、A value of 3 represents the "Implicit NULL Label"
正确答案:B,C,D,F
第8题：
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9题：
Which option describes the incorrect usage of the Label Distribution method？（）
- A、LDP is primarily used in internal networks of MPLS-VPN providers.
- B、MP-BGP is used for label distribution for VPN customer routes.
- C、Directed LDP is used for label distribution in L2-VPN Attachement Circuits.
- D、MP-BGP is used for label distribution in MPLS Traffic Engineered networks.
正确答案:D
第10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
正确答案:D