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| Section | Objectives |
|---|---|
| Network Services and Optimization | - Multicast Technologies
|
| MPLS and VPN Technologies | - MPLS Fundamentals
|
| IP Network Technologies | - IS-IS Routing Protocol
|
| Advanced Routing Protocols | - OSPF Advanced Features
|
| Network Design and Troubleshooting | - Fault Diagnosis
|
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NEW QUESTION # 205
In the figure, packets are forwarded based on MPLS on the network.
When PE2 receives a packet from P2, what is the label value carried in the packet?
Options:
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding MPLS Label Switching
MPLS (Multiprotocol Label Switching) operates by adding labels to packets to enable fast switching across an MPLS domain.
* Labels are swapped at each router (LSR - Label Switch Router) based on the LFIB (Label Forwarding Information Base).
* When an MPLS packet reaches a router, it checks the incoming label and swaps it with an outgoing label as per its label forwarding table.
* The label value " 3 " is the implicit null label, which is used for PHP (Penultimate Hop Popping).
2. Analyzing the MPLS Label Flow in the Figure
* At PE1: The packet enters the MPLS domain and is labeled with 1033.
* At P1: P1 forwards the packet based on label 1033.
* At P2:
* P2 receives label 1033 and swaps it with label 3 (as per the figure).
* Label 3 (implicit null) means that the label is removed before reaching PE2 (PHP - Penultimate Hop Popping).
* This ensures that PE2 receives a pure IP packet without an MPLS label.
3. Evaluating Each Answer Option
* Option A: " The label value is 3. " # Incorrect.
* Label 3 (implicit null) is not actually sent to PE2.
* Instead, P2 removes the label before sending the packet to PE2.
* Option B: " There is no label. " # Correct.
* Since P2 performs PHP (Penultimate Hop Popping), the label is removed, and PE2 receives only an IP packet.
* Option C: " The label value is 1033. " # Incorrect.
* Label 1033 was used earlier in the MPLS path but was swapped out before reaching PE2.
* Option D: " The label values are 3 and 1033. " # Incorrect.
* Only one label is present at a time.
* Label 1033 was swapped for label 3, but label 3 was removed before reaching PE2.
Final answer:
HCIP-Datacom-Advanced Routing & Switching Technology References:
* MPLS Label Forwarding Mechanism
* Penultimate Hop Popping (PHP) and Implicit Null Label (3)
* MPLS Label Swapping and Label Forwarding Table (LFIB)
NEW QUESTION # 206
On the OSPFv3 network shown in the figure:
* OSPFv3 is enabled on the interfaces connecting R1, R2, and R3.
* The router ID of each router is 10.0.X.X, where X is the number of the router.
* When checking detailed information about an LSA on R3, the command output shows that the LSA is generated by R2 and describes the IPv6 prefix address associated with the Network-LSA.
Based on this information, which of the following statements is correct?
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
To verify the correct answer, let's analyze the LSA types in OSPFv3 and how they work in the given topology.
1. Understanding OSPFv3 LSAs in the Figure
From the command output shown in the image:
* LS Type: Intra-Area-Prefix-LSA (Type 9 in OSPFv3).
* Originating Router: 10.0.2.2 (R2).
* Referenced LS Type: 0x2002, which corresponds to a Network-LSA (Type 2).
* Prefix Advertised: 2000:23::/64, which is an IPv6 prefix associated with a network segment.
2. What is an Intra-Area-Prefix LSA (Type 9) in OSPFv3?
* In OSPFv3, Type 9 LSAs (Intra-Area-Prefix LSAs) describe IPv6 prefixes associated with either Router-LSAs (Type 1) or Network-LSAs (Type 2).
* In multi-access networks (e.g., Ethernet), the DR (Designated Router) generates a Network-LSA (Type 2), which represents the shared network segment.
* R2 is likely the DR in this topology, meaning it generates a Network-LSA (Type 2) and an associated Intra-Area-Prefix LSA (Type 9) for the subnet.
3. Analyzing Why the Statement is TRUE
* R2 (10.0.2.2) is the originator of the Intra-Area-Prefix LSA (Type 9).
* The LSA references a Network-LSA (Type 2), confirming that R2 is the DR for the subnet.
* This means the LSA is correctly describing the IPv6 prefix associated with the network.
* Since the LSA is visible in R3's LSDB, R3 is learning this information from R2.
* All these points confirm that the statement is TRUE.
NEW QUESTION # 207
In the OSPF network shown in the figure, the area numbers are marked in the figure. Area 1 is a stub area, area 2 is a totally stub area, and area 3 is an NSSA area. Which of the following types of LSAs will not appear in areas 1, 2, and 3?
Answer: B
NEW QUESTION # 208
The network administrator configures DHCP snooping on an access switch. Which of the following solutions can be used to reduce the impact of denial of service (DoS) on the DHCP server caused by malicious IP address requests of attackers?
Answer: B,C,D
Explanation:
To mitigate DHCP-based DoS attacks, Huawei switches provide several protective measures through DHCP Snooping :
# A. Configure trusted interfaces - Only ports connected to authorized DHCP servers should be marked as trusted . All other interfaces are untrusted and DHCP replies (from rogue servers) will be discarded.
# C. CHADDR field verification - DHCP snooping can check the CHADDR field to ensure that the MAC address in the DHCP packet matches the one learned on the port, helping prevent spoofing attacks.
# D. Limit MAC address learning - Limits the number of dynamic MAC addresses a port can learn, preventing flooding of DHCP requests with spoofed MACs.
# B is incorrect - While DHCP snooping can generate bindings, it does not generate static MAC address entries based on these bindings. Static MAC addresses must be manually configured or generated via port security, not DHCP snooping.
# Official Reference from Huawei:
" To prevent DoS attacks caused by a large number of DHCP requests, DHCP snooping allows rate limiting, CHADDR field verification, and trusted port configuration. "
- [Huawei HCIA-Datacom Certification Guide - DHCP Snooping Chapter]
NEW QUESTION # 209
On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces. The AS number is 6500X, where X is the number of the router. Both R1 and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import-route command.
By default, in the routing table of R3, which of the following is the AS_Path attribute carried in the route to 192.168.1.0/24?
Answer: D
NEW QUESTION # 210
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