In the DU label distribution mode, if the Liberal retention mode is adopted, the device will retain the labels distributed by all LDP peers, regardless of whether the LDP peer is the optimal next hop to the destination network segment.

Part of the configuration of R1 is as follows. Which statement about OSPF on R1 is correct?

Regarding the content of network security optimization, which of the following options is incorrect?

If the display current-configuration can reveal the IS-IS configuration, but there is no IS-IS configuration in the display saved-configuration, then the explanation?

As shown in the figure, OSPF is enabled on all interfaces of the router. The ip address marked in the figure is the IP address of the loopback0 interface. The Loopback0 of R1, R2, and R3 is advertised in area 1, and the Loopback0 of R4 is advertised in area 0, Loopback0 of R5 announces which of the following functional addresses in area 2 can ping each other?