As shown in the figure, OSPF is enabled on all interfaces of the router, where R4 and R5 can establish OSPF virtual connections.

• A.FALSE
• B.TRUE

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What is the core idea of network troubleshooting?

• A.Judgmental Analysis
• B.Top-down approach
• C.Confirm the business traffic path
• D.Gathering Information

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Which of the following Community attributes can ensure that the propagation scope of BGP routing entries is only within the AS? (Multiple choice)

• A.No_Export_Subconfed
• B.Interne
• C.No Advertise
• D.No_Export

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As shown in the figure, a sham link is established between PE1 and PE2 through the LoopBack0 interface. CE2 can learn the route of network segment 192.168.1.0/24 (the direct route on CE1) through the sham link and the backdoor link. If the default configuration is maintained, the cost of the route from CE2 to network segment 192.168.1.0/24 should be ( ). (Please fill in the Arabic numerals directly, without symbols)

• A.4

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

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

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