An OSPF neighbor relationship fails to be established and the display ospf error command output is as follows.

Which of the following is the possible cause?
A. Router IDs conflict.QinQ provides a simplified Layer 2 VPN tunnel.
A. TrueWhich of the following packet drop policies can be applied to the congestion avoidance mechanism? (Select 3 Answers)
A. Tail-dropFor link-status routing protocols, filtering routes in the inbound direction actually cannot block the transmission of link-status information. The filtering effect is that routes cannot be injected into the local routing table but neighbors can still receive complete route status information and calculate complete routes.
A. TrueDefault routes between routers are a low-cost solution. This is because using default routes requires less system resources than maintaining a complete routing table.
A. TrueWhich statement is true?
A. The principal VLAN must be configured before subordinate VLANs.Which statements about the access interface are true? (Select 3 Answers)
A. Only the VLAN whose ID is the same as the PVID of the access interface are allowed on the access interface.On an RSTP network, when an edge port is in protected state, what operation is performed after the edge port receives BPDUs?
A. The edge port forwards BPDUs.Which of the following is not supported by policy-based route for specifying the data forwarding path?
A. Source addressDuring the GR of dynamic routing protocols (such as OSPF and BGP) neighbor relationships remain unchanged.
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