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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Advanced IGP Features | 17% | - IS-IS advanced features and convergence - OSPF advanced features and optimization - IGP route selection and control |
| Topic 2: Advanced Ethernet Technologies | 10% | - Advanced link aggregation and reliability - VLAN stacking and QinQ - Ethernet OAM and protection mechanisms |
| Topic 3: Network O&M | 7% | - Network monitoring and management tools - Performance optimization and capacity planning |
| Topic 4: Advanced BGP Features | 10% | - BGP path control and filtering - Route reflectors and confederations - BGP route attributes and policies |
| Topic 5: Network Troubleshooting | 10% | - Troubleshooting routing and switching issues - Fault diagnosis and analysis methods |
| Topic 6: IPv6 Routing | 20% | - IPv6 addressing and transition technologies - OSPFv3 and IS-IS for IPv6 - BGP4+ and IPv6 route deployment |
| Topic 7: MPLS Technologies | 19% | - MPLS VPN and traffic engineering - MPLS protection and fast reroute - MPLS basics and label distribution |
| Topic 8: Network Cutover and Migration | 7% | - Migration strategies and risk control - Service switchover and verification |
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133. Frage
Network administrators can run the clock timezone command to set the time zone of a device. If two network devices have different time zone settings, they cannot establish a neighbor relationship using a dynamic routing protocol.
Antwort: B
Begründung:
This statement is false . Time zone configuration using the clock timezone command affects only the local display of time on a device (e.g., logs, timestamps), and has no effect on dynamic routing protocol operation .
* OSPF, BGP, IS-IS , and other routing protocols do not rely on time synchronization or time zone matching between devices to establish neighbor relationships.
* Even if devices are in different time zones , they can still form adjacencies as long as IP connectivity and protocol parameters (e.g., hello/dead intervals, authentication) are correctly configured.
# Official Reference from Huawei:
" The clock timezone command sets the local time zone for display purposes. It does not affect protocol operations or neighbor relationships. "
- [Huawei HCIA-Datacom Certification Guide - System Management Section]
134. Frage
On the network shown in the figure, the network administrator configures the DHCP snooping trust function on the switch.
* GE0/0/2 is a trusted interface (connected to the DHCP Server).
* GE0/0/3 is an untrusted interface (potential attacker).
Which of the following statements are true about the two interfaces?
Options:
Antwort: A,C
Begründung:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding DHCP Snooping
DHCP Snooping is a security feature that filters untrusted DHCP messages to prevent attacks such as:
* Rogue DHCP servers distributing incorrect IP addresses.
* DHCP starvation attacks.
In DHCP Snooping, switch ports are classified as:
* Trusted Interfaces: Allow both DHCP requests and DHCP responses to pass through.
* Untrusted Interfaces: Allow only DHCP requests but drop DHCP responses (to prevent rogue DHCP servers).
2. Analyzing Each Answer Option
* Option A: " When receiving a DHCP response packet on GE0/0/2, the switch forwards the packet through GE0/0/1. "
* Correct.
* GE0/0/2 is a trusted interface (connected to the DHCP server).
* DHCP responses (ACK, NAK, OFFER) come from the DHCP Server.
* Since DHCP responses are allowed on trusted interfaces, the switch forwards them to the client (PC1) via GE0/0/1.
* Option B: " When receiving a DHCP request packet on GE0/0/2, the switch forwards the packet through GE0/0/3. "
* Incorrect.
* DHCP requests originate from clients (PC1, attackers, etc.), not from the DHCP server.
* The DHCP request should be forwarded to the DHCP server via a trusted interface (not GE0/0/3, which is untrusted).
* Option C: " When receiving a DHCP response packet on GE0/0/3, the switch forwards the packet through GE0/0/1. "
* Incorrect.
* GE0/0/3 is an untrusted interface (connected to the attacker).
* DHCP responses (ACK, OFFER) from untrusted interfaces are dropped to prevent rogue DHCP attacks.
* The switch will not forward the packet.
* Option D: " When receiving a DHCP request packet on GE0/0/3, the switch forwards the packet through GE0/0/2. "
* Correct.
* DHCP requests originate from clients (PC1 or attacker).
* Since DHCP requests are allowed on untrusted interfaces, the switch forwards them to the DHCP server via the trusted interface (GE0/0/2).
Final Answer:
# A and D are correct.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* DHCP Snooping and Port Trust Classification
* How Trusted and Untrusted Ports Handle DHCP Packets
* Preventing Rogue DHCP Servers Using DHCP Snooping
135. Frage
On the ISIS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. In this case, R3 can learn this default route through IS-IS.
Antwort: B
136. Frage
As shown in the figure, an engineer uses 4 routers to test branch network interoperability. Among them, R1, R2, and R3 in branch 1 deploy OSPF to implement network interoperability. R2, R3, and R4 in branch 2 deploy IS-S to implement network interoperability. Now the engineer wants to implement R1 to access the loopback interface address of R4. Which of the following operations can meet this requirement?
Antwort: C
137. Frage
When creating an IPv6 static route, for a point-to-point interface, the outbound interface must be specified. For a broadcast type interface, the next hop must be specified.
Antwort: A
138. Frage
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