On a broadcast network with four routers, all the routers run OSPFv3, and the DR priorities of all the routers are not 0. How many adjacencies are there on the network?

You cannot create VLAN 4095 when creating a VLAN rule on a Huawei switch. You cannot delete VLAN 1.

When the network device sends the IPv6 packet, the packet length is compared with the NTU value. If the value is greater than the MTU value, the packet is directly discarded.

If AH and ESP are both required to protect data streams between IPsec peers, how many Security Associations (SA) are required in total?

Which of the following authentication methods does not require to input a username and password?