In an MPLS network, there are different types of operations for labels, among which the meaning of the "pop" action is?

• A.Remove the top label from the MPLS label stack
• B.Add the top label to the MPLS label stack
• C.Replace the top label with another value
• D.Replace the top label with another set of labels

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Qing technology is a technology that expands the VLAN space. It achieves the function of expanding the VLAN space by adding a layer of 8D2.1Q Tag on the basis of the 8Q2.12 tag message.
Which of the following statements about qinq is wrong?

• A.QinQ technology can make the private network LAN transparently transmitted on the public network
• B.Basic QinQ is implemented based on the interface method
• C.Flexible QinQ can add different outer tags according to different inner tags, which is more precise in the division of user VLANs.
• D.QinQ increases the number of VLANs to 4095*4095

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According to this picture, we can judge:

• A.The device type of R1 is Level-1
• B.The device type of R1 is Level-2
• C.R1 is configured with regional authentication
• D.R1 has configured the routing domain authentication

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A network engineer outputs the following information when troubleshooting OSPF. Based on this, determine which reason causes the adjacency relationship to fail to be established normally?

• A.The interval for sending Hello messages is not-consistent
• B.Regional type is not-consistent
• C.Authentication password is not-consistent
• D.The IP address mask of the interface is not-consistent

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According to this figure, which statement is correct about the IPv6 routing information calculated by the R4 router through IS-IS?

• A.R4withoutIS-ISrouting entry for
• B.day4have1stripIS-ISdefault route
• C.R4have2not equivalentIS-ISdefault route
• D.R4have2equivalentIS-ISdefault route

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