Huawei HCIP-Datacom-Core Technology V1.0 H12-821 Dumps in PDF

Free Huawei H12-821 Real Questions (page: 7)

When a routing policy is used to filter routes, which of the following route prefixes will be denied by the IP prefix below? (Choose all that apply.)

[HUAWEI]ip ip-prefix aa index 10 deny 1.1.1.1 24
[HUAWEI]ip ip-prefix aa index 20 permit 1.1.1.1 32

  1. 1.1.1.2/16
  2. 1.1.1.1/24
  3. 1.1.1.1/26
  4. 1.1.1.1/32

Answer(s): B

Explanation:

The IP prefix list in the question operates as follows:
1. [HUAWEI]ip ip-prefix aa index 10 deny 1.1.1.1 24:
This rule denies any route with the exact prefix 1.1.1.1/24.

2. [HUAWEI]ip ip-prefix aa index 20 permit 1.1.1.1 32:
This rule permits any route with the exact prefix 1.1.1.1/32.

The rules are processed in order, and once a route matches a rule, subsequent rules are not considered.



Which of the following statements about multi-active detection (MAD) in a stack is false?

  1. Two stacks can use the same domain ID when they function as MAD relay agents of each other.
  2. MAD relay detection requires that all stack members be connected to the MAD relay agent and the connected links be added to the same Eth-Trunk.
  3. MAD in direct mode can be implemented through intermediate devices or in full-mesh mode.
  4. MAD can be implemented in direct or relay mode.

Answer(s): A

Explanation:

MAD (Multi-Active Detection) requires that two stacks in the same network use different domain IDs to avoid conflicts. The domain ID uniquely identifies each stack in the network. If two stacks have the same domain ID, the MAD mechanism cannot properly detect and resolve split-brain scenarios.
When stacks function as MAD relay agents for each other, they must still maintain unique domain IDs.



On the network shown in the figure, three switches run RSTR The figure shows the configuration.
Which is the root switch?

  1. Uncertain
  2. SWA
  3. SWB
  4. SWC

Answer(s): B

Explanation:

In Rapid Spanning Tree Protocol (RSTP), the root bridge is elected based on the lowest bridge ID (BID), which is a combination of priority and MAC address.
Analysis of the Figure and Configuration:
SWA: Priority: 4096 (lower priority is preferred).

SWB: Priority: 8192 (higher than SWA's priority).

SWC: Priority: Default (32,768, as not explicitly configured).

The root switch is the one with the lowest priority. If priorities are the same, the switch with the lowest MAC address is chosen. In this case SWA has the lowest priority (4096), so it becomes the root switch.
The root switch is SWA, as it has the lowest configured priority.



Which of the following statements is false, based on the following IGMP information on an interface of RTA?

  1. The IP address of the interface is 192.168.1.1.
  2. The interval for sending group-specific Query messages is 60s.
  3. The maximum time for response to Query messages is 10s.
  4. The IGMP version is IGMPv2.

Answer(s): B

Explanation:

The 60s interval in the output refers to the configured query interval for general Query messages, not group- specific queries. Group-specific queries are typically sent with shorter intervals, depending on the multicast configuration.



Which of the following values can be used to set security levels of user-defined zones of USG series firewalls? (Choose all that apply.)

  1. 40
  2. 80
  3. 100
  4. 150

Answer(s): A,B,C

Explanation:

The security level of zones on USG series firewalls determines the trustworthiness of traffic within the zones.
It can range from 1 to 100, where higher values indicate a higher level of trust. The default system-defined zones are as follows:
Untrust Zone: Security level 5 (least trusted).

DMZ Zone: Security level 50.

Trust Zone: Security level 85 (most trusted).

For user-defined zones, the security levels must also fall within the 1­100 range, and valid values include 40, 80, and 100.
100 should indeed be the maximum possible value.



Which of the following is correct procedure for a DHCP client to apply for an IP address from a DHCP server?

1. The host sends a DHCP Request message to request an IP address.

2. The DHCP server responds with a DHCP Offer packet.
3. The host sends a DHCP Discover packet to search for the DHCP server.
4. After receiving the request, the server returns an ACK message.

  1. 1-4-3-2
  2. 3-4-1-2
  3. 1-2-3-4
  4. 3-2-1-4

Answer(s): D

Explanation:

The correct DHCP client-server process for IP address allocation is as follows:
1. DHCP Discover (Step 3):
The DHCP client broadcasts a Discover message to locate available DHCP servers.

2. DHCP Offer (Step 2):
The DHCP server responds with an Offer message, proposing an available IP address and other configuration details.
3. DHCP Request (Step 1):
The client sends a Request message to indicate its acceptance of the offered IP address.

4. DHCP ACK (Step 4):
The server acknowledges the client's request with an ACK message, confirming the allocation of the IP

address.



Which of the following LSAs can carry tag information of external routes?

  1. Type 2 LSA
  2. Type 5 LSA
  3. Type 4 LSA
  4. Type 3 LSA

Answer(s): B

Explanation:

In OSPF (Open Shortest Path First), Type 5 LSAs (AS-External LSAs) are used to advertise external routes, which are routes redistributed into OSPF from other routing protocols or static configurations. These LSAs can carry tag information associated with the external routes for purposes such as route identification, policy enforcement, or filtering.



Which of the following statements regarding the OSPF protocol are true? (Choose all that apply.)

  1. An AS-External-LSA does not belong to any area.
  2. An AS-External-LSA describes a route from a router to an ASBR.
  3. The cost of a Type 2 external route is only the AS external cost value, ignore AS internal cost value.
  4. An AS-External-LSA describes an AS external route and is flooded outside an AS.

Answer(s): A,C

Explanation:

An AS-External-LSA does not belong to any area.
True: An AS-External-LSA (Type 5 LSA) describes external routes (routes redistributed into OSPF from other protocols or static routes) and is flooded to all areas except stub and totally stubby areas.
While it is originated by an ASBR, it is not tied to any specific area.
The cost of a Type 2 external route is only the AS external cost value, ignoring the AS internal cost value.
True: For Type 2 external routes, OSPF considers only the external cost (the cost assigned by the ASBR) and ignores the internal OSPF cost to reach the ASBR.



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