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| Section | Weight | Objectives |
|---|---|---|
| Network Solutions and Design | 5% | - Enterprise network design principles - Typical network architecture and solution |
| IS-IS Fundamentals | 8% | - IS-IS configuration and deployment - IS-IS protocol principles |
| Multicast Technologies | 9% | - IGMP protocol - PIM protocol - Multicast basic concepts |
| Routing and Traffic Control | 10% | - Policy-based routing - Routing policy and filtering - Route import and redistribution |
| Network Service and Management | 5% | - Network management and monitoring - DHCP and DNS services |
| BGP Fundamentals | 17% | - BGP configuration and policy application - BGP route attributes and selection - BGP characteristics and working principles |
| Network Reliability | 7% | - VRRP protocol - Device redundancy and link backup - BFD technology |
| Routing Basics | 3% | - Routing concepts and classification - Routing table composition and selection rules |
| IPv6 Technologies | 3% | - IPv6 routing protocols - IPv6 address structure and configuration |
| Ethernet Switching Technologies | 7% | - VLAN principles and configuration - Spanning Tree Protocol - Link aggregation and stack technology |
| Network Security | 8% | - AAA authentication - Attack defense and security policy - ACL and packet filtering |
| OSPF Fundamentals | 16% | - OSPF special applications and troubleshooting - OSPF configuration and optimization - OSPF principles and operation mechanisms |
| WLAN Basics | 2% | - WLAN deployment and optimization - WLAN technology principles |
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NEW QUESTION # 153
As shown in the figure, R1 imports the direct route 10.1.1.0/24 to OSPF. An engineer enables bidirectional route re-advertisement on R2 and R3.
After the network becomes stable, which of the following is the Pre (preference) value of the route 10.1.1.0
/24 in the routing table of R3?
Answer: A
Explanation:
Let's break it down step by step based on Huawei's routing protocol behavior:
* R1 imports the direct route 10.1.1.0/24 into OSPF.
* This route is advertised by R1 to R2 and R3 via OSPF.
* Both R2 and R3 are running IS-IS, and bidirectional route redistribution is configured between OSPF and IS-IS.
* R2 and R3 both re-advertise the OSPF-learned route into IS-IS and then potentially re-learn it back from the IS-IS domain, causing redistribution loops unless properly controlled.
* Now, the question focuses on R3's routing table:
* R3 already learns the route directly via OSPF from R1.
* It also learns the same route again via IS-IS from R2 (looped back due to bidirectional redistribution).
* Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
* "OSPF ASE routes are assigned a default preference of 150. If a route is redistributed from another protocol (like IS-IS) into OSPF, and then re-learned, it is considered an ASE route."(Chapter: OSPF Advanced Features - Section: Route Redistribution Behavior)
NEW QUESTION # 154
OSPF has five types of packets, which have the same header format. If the Auth Type field in the packet header is 1, which of the following authentication modes is used?
Answer: A
Explanation:
The Auth Type field in the OSPF packet header determines the authentication mode. If the Auth Type is 1, plaintext authentication is used.
Plaintext authentication involves transmitting the password in an easily readable format, which is less secure compared to MD5.
NEW QUESTION # 155
When deploying BFD, you need to adjust some parameters so that it can better detect the network status.
Which of the following statements is false about BFD optimization?
Answer: D
Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
1. Overview of BFD Optimization:
* BFD (Bidirectional Forwarding Detection) is a protocol that provides rapid detection of link failures.
* Optimizing BFD involves adjusting parameters to balance between detection speed and network stability.
2. Analysis of Each Statement:
Option A: After a high priority is configured for BFD packets, BFD packets are preferentially forwarded.
* Correct (True Statement).
* High priority ensures that BFD packets are not delayed or dropped under congestion, improving detection accuracy.
Option B: To quickly learn about the network status and performance requirements, you can set the interval for sending BFD packets to the minimum value.
* Incorrect (False Statement).
* Setting the interval to the minimum value can lead to excessive BFD session flapping, which may overload the network or cause instability. The interval should be configured based on network requirements and conditions, rather than set to the minimum.
Option C: On a live network, some devices switch traffic only when a BFD session changes to the Up state... configure a delay to compensate for the time difference.
* Correct (True Statement).
* This is a valid optimization to avoid issues caused by timing mismatches between BFD and routing protocols.
Option D: If a BFD session flaps, master/backup switchovers are frequently performed... set the WTR time.
* Correct (True Statement).
* The WTR (Wait to Restore) timer helps stabilize BFD by delaying session recovery after a flap, reducing the risk of frequent switchovers.
3. Summary:
* The false statement is B, as setting the BFD packet interval to the minimum can destabilize the network.
NEW QUESTION # 156
Routes are injected into BGP through the network command.
Which is wrong? (Multiple choice)
Answer: A,B
NEW QUESTION # 157
In IGMPv1, querier selection depends on a multicast routing protocol, such as PIM. In IGMPv2 and IGMPv3, the interface with the largest IP address acts as the querier.
Answer: B
Explanation:
Comprehensive and Detailed Step-by-Step
IGMPv1 Querier Selection:
In IGMPv1, there is no built-in querier election mechanism. Querier selection depends on the multicast routing protocol (e.g., PIM).
IGMPv2 and IGMPv3 Querier Selection:
In IGMPv2 and IGMPv3, the router interface with the largest IP address in the multicast group is selected as the querier.
NEW QUESTION # 158
......
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