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Huawei H12-821_V1.0 Exam Syllabus Topics:

SectionObjectives
Network Service and Management- O&M Technologies
  • 1. Network Monitoring
  • 2. SNMP
  • 3. Telemetry
OSPF- OSPF Fundamentals
  • 1. OSPF Neighbor Relationship
  • 2. OSPF Area Design
  • 3. LSA and SPF Calculation
WLAN- Wireless Networking
  • 1. Wireless Security
  • 2. WLAN Deployment
  • 3. WLAN Architecture
Multicast- IP Multicast Technologies
  • 1. PIM
  • 2. Multicast Forwarding
  • 3. IGMP
Network Security- Security Technologies
  • 1. Attack Prevention
  • 2. AAA
  • 3. ACL
Routing and Traffic Control- Traffic Management
  • 1. Traffic Optimization
  • 2. Route Filtering
  • 3. Policy-based Routing
Network Solutions- Enterprise Network Solutions
  • 1. Datacom Architecture
  • 2. WAN Solution
  • 3. Campus Network
Network Reliability- Reliability Technologies
  • 1. BFD
  • 2. VRRP
  • 3. Redundancy Design
IS-IS- IS-IS Fundamentals
  • 1. Level-1 and Level-2 Routing
  • 2. LSP and SPF Mechanism
  • 3. IS-IS Neighbor Establishment
Routing Basics- IP Routing Fundamentals
  • 1. Static Routing
  • 2. Routing Table Principles
  • 3. Route Selection
BGP- BGP Technologies
  • 1. IBGP and EBGP
  • 2. BGP Route Advertisement
  • 3. BGP Path Selection
Ethernet Switching Technology- Switching Fundamentals
  • 1. VLAN
  • 2. STP/RSTP/MSTP
  • 3. Link Aggregation
IPv6- IPv6 Fundamentals
  • 1. IPv6 Addressing
  • 2. IPv6 Routing
  • 3. IPv4 to IPv6 Transition

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最新的 HCIP-Datacom H12-821_V1.0 免費考試真題 (Q308-Q313):

問題 #308
In PIM-DM, which of the following processes are involved in SPT establishment?

答案：A,C,D

解題說明：
In PIM-DM (Protocol Independent Multicast - Dense Mode), the SPT (Shortest Path Tree) establishment process involves flooding to propagate multicast traffic across the network, prune messages to stop sending multicast traffic to unwanted interfaces, and graft messages to re-establish forwarding when needed. State- refresh is not directly involved in SPT establishment but helps maintain the prune state .


問題 #309
R1, R2, R3, and R4 run IS-IS, and the DIS priorities of their interfaces are shown in the following figure. If all these devices are started simultaneously, will be elected as the DIS. (Enter the device name, for example, R1.)

答案：

解題說明：
R4
Explanation:
DIS Election in IS-IS:
In IS-IS, the Designated Intermediate System (DIS) is elected on broadcast networks to reduce the number of LSAs exchanged and maintain the LSDB.
The DIS is elected based on priority:
The router with the highest priority is elected as the DIS.
If priorities are equal, the System ID is used as a tie-breaker, and the router with the highest System ID becomes the DIS.
HCIP-Datacom-Core Technology Training Material (IS-IS DIS Election Mechanism).
Given DIS Priorities:
R1: Priority = 10
R2: Priority = 20
R3: Priority = 30
R4: Priority = 40
R4 has the highest DIS priority of 40, which makes it the clear choice for DIS election.
Scenario Details:
Since all devices are started simultaneously, the DIS election process will follow the priorities without requiring a tie-breaker (System ID).
Conclusion:
The device with the highest DIS priority is R4, and it will be elected as the DIS.


問題 #310
See the following figure. All routers on the network run IS-IS and are in area 49.0001.
By referring to the LSDB of R1, the Level-2 DIS is. (Enter the device name, for example, R1.)

答案：

解題說明：
R3
* Understanding the LSDB and Level-2 DIS Election in IS-IS :
* In IS-IS, the Designated Intermediate System (DIS) is elected for both Level-1 and Level-2 on broadcast networks to manage the link-state database (LSDB) and reduce the number of LSAs exchanged.
* The election of the DIS is based on the highest priority . If the priority is the same, the router with the highest System ID becomes the DIS.
* HCIP-Datacom-Core Technology Training Material (IS-IS DIS Election) .
Analyzing the LSDB :
From the LSDB of R1 , the Level-2 link-state database includes the following entries:
LSPID 0100.0000.3003.00-00 : This is R3, and it is present in the Level-2 LSDB with the sequence number and checksum details.
Other routers (R1, R2, R4) are present but do not have the characteristics of the Level-2 DIS in this topology.
Based on the System IDs, R3 (0100.0000.3003) has the highest System ID, making it the Level-2 DIS .
Conclusion :
The Level-2 DIS on the network is R3 , based on the election rules and the LSDB information shown in the figure.


問題 #311
Which of the following descriptions about VRRP load sharing is incorrect?

答案：A


問題 #312
On an OSPF network, if a router receives an update of an LSA that exists in the local LSDB, the router updates the LSDB and floods the LSA.

答案：A

解題說明：
If a router receives an LSA identical to one already in its LSDB, it does not flood the LSA again unless the LSA has changed (i.e., the sequence number or content has been updated). OSPF ensures efficient use of bandwidth by avoiding redundant flooding of unchanged LSAs.


問題 #313
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