Huawei Updated H12-821_V1.0 Exam Questions and Answers by faye

The default Hello interval on an OSPF P2P (Point-to-Point) or Broadcast network is 10 seconds , and the default Dead interval is 40 seconds .

The Dead interval is the time a router waits without receiving a Hello packet from a neighbor before declaring it down.

Reference from Huawei HCIP-Datacom-Core Technology Study Guide:

“For broadcast and P2P network types, the default Hello interval is 10 seconds and the Dead interval is 40 seconds.”

(Chapter: OSPF Interface Types – Section: OSPF Timers)

The IPv6 address 2001:0DBB:B8:0000:C030:0000:0000:09A0:CDEF can be compressed by removing leading zeros in each segment and collapsing consecutive zero groups into ::. The result is 2001:DBB:B8:0:C030::9A0:CDEF ​.

All four are valid reasons why IKE (Internet Key Exchange) negotiation might not be triggered:

A – Security policy mismatches can block data flows , preventing IPsec from initiating.

B – If the route to the peer is unreachable , no packets can reach the tunnel interface, and IKE will not start.

C – If the IPsec policy is not bound to the correct interface , no protection is triggered.

D – If the ACL does not match the actual traffic , the flow will bypass IPsec.

Reference from Huawei HCIP-Datacom-Core Technology Study Guide:

“Common causes of IKE negotiation failure include incorrect ACLs, misapplied policies, unreachable peers, and misconfigured security zones.”

(Chapter: VPN Technologies – Section: IPsec Troubleshooting)