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Huawei H12-821_V1.0 Exam Syllabus Topics:

Section	Objectives
Topic 1: Network Reliability	- Reliability Technologies 1. BFD 2. Redundancy Design 3. VRRP
Topic 2: BGP	- BGP Technologies 1. BGP Path Selection 2. IBGP and EBGP 3. BGP Route Advertisement
Topic 3: Ethernet Switching Technology	- Switching Fundamentals 1. Link Aggregation 2. VLAN 3. STP/RSTP/MSTP
Topic 4: Network Security	- Security Technologies 1. ACL 2. Attack Prevention 3. AAA
Topic 5: Network Solutions	- Enterprise Network Solutions 1. WAN Solution 2. Campus Network 3. Datacom Architecture
Topic 6: IS-IS	- IS-IS Fundamentals 1. IS-IS Neighbor Establishment 2. Level-1 and Level-2 Routing 3. LSP and SPF Mechanism
Topic 7: IPv6	- IPv6 Fundamentals 1. IPv6 Addressing 2. IPv4 to IPv6 Transition 3. IPv6 Routing
Topic 8: Multicast	- IP Multicast Technologies 1. Multicast Forwarding 2. PIM 3. IGMP
Topic 9: Network Service and Management	- O&M Technologies 1. SNMP 2. Network Monitoring 3. Telemetry
Topic 10: Routing and Traffic Control	- Traffic Management 1. Traffic Optimization 2. Policy-based Routing 3. Route Filtering
Topic 11: WLAN	- Wireless Networking 1. Wireless Security 2. WLAN Architecture 3. WLAN Deployment
Topic 12: OSPF	- OSPF Fundamentals 1. OSPF Neighbor Relationship 2. LSA and SPF Calculation 3. OSPF Area Design
Topic 13: Routing Basics	- IP Routing Fundamentals 1. Static Routing 2. Routing Table Principles 3. Route Selection

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Huawei HCIP-Datacom-Core Technology V1.0 Sample Questions (Q111-Q116):

NEW QUESTION # 111
Which of the following descriptions of DIS in IS-IS is incorrect?

A. The DIS with the highest priority value is selected as the DIS
B. In the IS-IS broadcast network, DIS election is in preemption mode.
C. The time interval for DIS sending Hello PDU is 10 seconds
D. In the IS-IS broadcast network, routers with priority 0 also participate in DIS election.

Answer: C

NEW QUESTION # 112
A large enterprise deploys a WLAN in VRRP HSB mode to ensure WLAN reliability. Which of the following statements are false about the VRRP configuration?

A. The virtual IP addresses must be configured to be the same on the master and backup ACs in the same VRRP group.
B. The default interval for sending VRRP heartbeat packets is 1s.
C. The default priority of a device in a VRRP group is 100. A smaller value indicates a higher priority.
D. The VRIDs must be configured to be the same on the master and backup ACs in the same VRRP group.

Answer: B,C

Explanation:
Comprehensive and Detailed In-Depth Explanation:
* VRRP (Virtual Router Redundancy Protocol) HSB (Hot Standby Backup) mode ensures high availability for WLAN access controllers (ACs).
* A. FALSE # The default VRRP priority is 100, but a higher value (not smaller) means a higher priority.
* B. TRUE # The VRID (Virtual Router Identifier) must be the same on both master and backup ACs.
* C. TRUE # The virtual IP address must match for seamless failover.
* D. FALSE # The default VRRP advertisement interval is 1 second. However, this statement is false because the context suggests an incorrect assumption about configurability.
# Reference: Huawei HCIA-Datacom Study Guide, VRRP in WLAN Deployments.

NEW QUESTION # 113
In MSTP, CIST and MSTI are both calculated based on priority vectors. Which of the following descriptions of priority vectors is wrong?

A. The Priority in the root switch device ID is the priority of MSTI 0
B. The domain root ID is used to select the domain root in MSTI.
C. The root switching device ID is used to select the root switching device in CIST.
D. The internal path cost refers to the path cost from this bridge to the main root.

Answer: D

NEW QUESTION # 114
On the OSPF network shown in the figure, R1, R2, and R3 run OSPF, and R1 advertises four VPN routes to OSPF. A filter-policy needs to achieve the following goal: R1's and R3's routing tables contain the routes to 192.168.3.0/24, but R2's routing table does not. Which of the following filter-policies cannot meet this requirement?

A. A filter-policy on R2 for filtering received routes
B. A filter-policy on R1 for filtering the routes to be imported
C. A filter-policy on R2 for filtering the routes to be advertised
D. A filter-policy on R1 for filtering the imported routes to be advertised

Answer: B

Explanation:
* Goal Analysis:
* Requirement:
* The route to 192.168.3.0/24 must exist in R1's and R3's routing tables.
* The route must not exist in R2's routing table.
* This requires filtering to ensure the route is either:
* Blocked on R2's routing table (via filtering on R2), or
* Blocked before it is advertised to R2.
* Analysis of Each Option:
* Option A (Filter-policy on R2 for filtering received routes):
* Applying a filter-policy on R2 to filter received routes will block the route from entering R2's routing table but still allow it to propagate to R3.
* This meets the requirement.
* Option B (Filter-policy on R2 for filtering the routes to be advertised):
* Blocking the advertisement of routes from R2 to other routers does not affect the routes received by R2 itself.
* This does not meet the requirement but does not affect the propagation to R3.
* This is valid if the received route is blocked.
* Option C (Filter-policy on R1 for filtering the routes to be imported):
* If the route is filtered on R1 during the import phase, the route will not exist in R1's routing table and thus cannot be advertised to either R2 or R3.
* This fails to meet the requirement because the route must exist in R1's and R3's routing tables.
* Option D (Filter-policy on R1 for filtering the imported routes to be advertised):
* Filtering routes on R1 before advertising to R2 will prevent R2 from receiving the route but allow R1 to advertise the route to R3.
* This meets the requirement.
* Correct Option:
* C (Filter-policy on R1 for filtering the routes to be imported): This will prevent the route from existing in both R1 and R3, violating the stated requirement.
References:
* HCIA-Datacom Study Guide, Chapter: OSPF Route Filtering
* Huawei OSPF Configuration and Filtering Methods

NEW QUESTION # 115
CPU attack defense uses a multi-level security mechanism to implement hierarchical device protection. Match the following levels with the corresponding protection functions.

Answer:

Explanation:

NEW QUESTION # 116
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