Huawei HCIP-Datacom-Core Technology V1.0 H12-821_V1.0 Dumps in PDF

Free Huawei H12-821_V1.0 Real Questions (page: 6)

Which of the following statements about the AC's mobility group are false? (Choose all that apply.)

  1. STAs can roam only between ACs in the same mobility group.
  2. The mobility server must be an AC in the local mobility group.
  3. A mobility server needs to be specified for member ACs in a mobility group.
  4. ACs in the same mobility group encapsulate and transmit roaming information over the DTLS extended tunnel.

Answer(s): A,B

Explanation:

STAs can roam only between ACs in the same mobility group.
False: While STAs typically roam within the same mobility group for seamless handover, they can roam across different mobility groups if the network is configured to support inter-mobility group roaming through proper coordination and tunneling.
The mobility server must be an AC in the local mobility group.
False: A mobility server does not necessarily have to be an AC in the local mobility group. A mobility server can be a dedicated device or another AC, depending on the network configuration.



Which of the following IEEE 802.11 standards is also known as Wi-Fi 6?

  1. 802.11n
  2. 802.11b
  3. 802.11ac
  4. 802.11ax

Answer(s): D

Explanation:

Wi-Fi 6 is the marketing name for the IEEE 802.11ax standard. It is the latest generation of Wi-Fi technology designed to improve performance, capacity, and efficiency, especially in dense environments. Key features of Wi-Fi 6 include:
Higher data rates and improved throughput.

Better performance in crowded environments through technologies like OFDMA (Orthogonal Frequency

Division Multiple Access) and BSS Coloring.
Improved power efficiency for connected devices using Target Wake Time (TWT).



Which of the following statements about the forwarding plane of a switch is false?

  1. Provides high-speed and non-blocking data channels.
  2. Can collect packet statistics.
  3. Can encapsulate and decapsulate packets.
  4. Consists of main control boards and interface boards.

Answer(s): D

Explanation:

The forwarding plane primarily consists of specialized hardware components such as ASICs (Application- Specific Integrated Circuits) or NPUs (Network Processing Units) that are designed for high-speed packet forwarding. The main control board is part of the control plane, which manages routing and switching decisions, and is separate from the forwarding plane.



Which of the following statements regarding DR/BDR are false? (Choose all that apply.)

  1. In a broadcast network, DR and BDR must be elected. A broadcast network without a DR or BDR cannot operate normally.
  2. All DR others establish neighbor relationships with DR and BDR only.
  3. DR others listen on the multicast address 224.0.0.5.
  4. DR others listen on the network address 224.0.0.6.

Answer(s): A,D

Explanation:

In a broadcast network, DR and BDR must be elected. A broadcast network without a DR or BDR cannot operate normally.
False: While DR and BDR are elected in broadcast networks to optimize OSPF operations, the network can still operate without a DR/BDR. However, without a DR/BDR, OSPF would require full mesh adjacencies among all routers, which is less efficient but functional.
DR others listen on the network address 224.0.0.6.
False: The multicast address 224.0.0.6 is used by the DR and BDR to listen for OSPF messages from DR others, not the other way around.



Which of the following statements regarding router ID in dynamic routing protocols is false?

  1. After a router ID changes, router ID of each protocol will change without requiring additional operations.
  2. If no router ID is manually configured and loopback interface addresses are configured, the largest loopback interface address is used as the router ID.
  3. If a router ID is manually configured using the router-id command, this router ID will be used.
  4. If no router ID and no loopback interface address are configured, the largest physical interface IP address is used as the router I

Answer(s): A

Explanation:

In dynamic routing protocols (e.g., OSPF, BGP, IS-IS), the router ID is typically set when the protocol process is initialized.
If the router ID is changed, most protocols (e.g., OSPF or BGP) require the process to be restarted or reloaded for the new router ID to take effect. It does not change automatically across protocols without additional operations.



Which of the following statements regarding OSPF AS-External-LSA are true? (Choose all that apply.)

  1. Net mask is set to all 0s.
  2. Advertising Router is set as the router ID of an ASBR.
  3. Link State ID and Advertising Router can uniquely identify an AS-External-LSA.
  4. Link State ID is set as an address on the destination network segment.

Answer(s): B,C

Explanation:

Advertising Router is set as the router ID of an ASBR.
True: The Advertising Router field in an AS-External-LSA contains the Router ID of the ASBR (Autonomous System Boundary Router) that generated the LSA. This helps in identifying the origin of the external route.

Link State ID and Advertising Router can uniquely identify an AS-External-LSA.
True: In OSPF, the combination of the Link State ID (which represents the external network) and the Advertising Router (the ASBR's router ID) uniquely identifies an AS-External-LSA. This ensures that LSAs are uniquely tracked and processed.



Which of the following statements regarding BGP peer are false? (Choose all that apply.)

  1. BGP peers exchange link state information.
  2. A UDP connection must be established before BGP relationships are established.
  3. BGP routers support automatic neighbor discovery.
  4. BGP peers must be configured with MD5 authentication.

Answer(s): A,B,C

Explanation:

BGP peers exchange link state information.
False: BGP is a path vector protocol, not a link-state protocol. BGP peers exchange prefix reachability information (NLRI) instead of link-state information. This makes BGP suitable for inter-domain routing.
A UDP connection must be established before BGP relationships are established.
False: BGP uses TCP, not UDP. Specifically, BGP establishes a TCP connection on port 179 between peers before exchanging routing information. TCP ensures reliable communication between peers.
BGP routers support automatic neighbor discovery.
False: BGP does not support automatic neighbor discovery like some IGPs (e.g., OSPF or EIGRP). BGP neighbors (peers) must be explicitly configured using the neighbor command with the peer's IP address.



Which of the following statements regarding BGP message types and characteristics is false?

  1. Hello messages are periodically sent between BGP peers to maintain their connection.
  2. Update messages are used to exchange routing information between BGP peers.
  3. Open messages are used to establish a peer relationship between two neighbors.
  4. Notification messages are used to transmit error information between BGP Speakers.

Answer(s): A

Explanation:

BGP does not use Hello messages to maintain peer connections. Instead, BGP uses Keepalive messages, which are sent periodically (every 60 seconds by default) to ensure the session remains active. Hello messages are a concept in other protocols like OSPF, not BGP.



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