OSPF fast convergence is an extended feature to improve the convergence speed of routing, in which PRC works by speeding up routing computation by performing path calculations only on the affected nodes when the network topology changes.

The following description of VLANs in Ethernet is correct?

In ospf broadcast networks, there are 4 routers RTA, RTB, RTC, and RTDs within the same network segment The DR priorities are 2, 1, 1, and O, and the Router ID is respective 1921681.1, 19216821, 19216831, and 192
16841 If the OSPF protocol is enabled on both of these four routers, ospf selects the BDR as

Man-in-the-middle attacks or IP/MAC spoofing attacks can lead to information leakage and other hazards, and are more common in the intranet, in order to prevent man-in-the-middle attacks or IP/MAC spoofing attacks, you can take the configuration method

If you want to advertise 19072270/27 to an EBGP neighbor, is the following command correct?