Huawei H12-821_V1.0 Based on Real Exam Environment

Route exchange between different OSPF processes is similar to route exchange between different routing protocols.

An interface of a router belongs to only a certain OSPF process.

The OSPF process IDs must be the same when OSPF neighbor relationships are established between different routers.

Multiple OSPF processes can run on the same router, and they are independent of each other.

After a stack splits, the MAC addresses of the two stacks change immediately.

If the master and standby switches are still in the same stack after the stack splits, the slave switches separated from the original master and standby switches re-elect the master and standby switches due to protocol packet timeout.

If the master and standby switches are in two stacks after the split, the stack where the original master switch resides updates the topology and selects a new standby switch. The original standby switch becomes the master switch in the new stack and a new standby switch is elected.

After a stack splits, multiple stacks have the same IP address and MAC address. To prevent network faults, the stacks perform MAD detection. The stack that fails the MAD detection shuts down all physical ports except reserved ports.

When the stateful inspection firewall checks packets, packets of one same connection are not correlated.

Because UDP is a connectionless protocol, so the stateful inspection firewall cannot match UDP packets with the status table.

The stateful inspection firewall only needs to match the first data packet against a rule, and the subsequent packets of the connection are matched directly in the state table.

The stateful inspection firewall needs to match the rules for each incoming packet.

Backup port, alternative port

Alternative port, backup port

Backup port, root port

Root port, designated port