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| Section | Objectives |
|---|---|
| Topic 1: MPLS and VPN Technologies | - VPN Implementation
|
| Topic 2: IP Network Technologies | - IS-IS Routing Protocol
|
| Topic 3: Network Design and Troubleshooting | - Fault Diagnosis
|
| Topic 4: Network Services and Optimization | - Multicast Technologies
|
| Topic 5: Advanced Routing Protocols | - OSPF Advanced Features
|
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NEW QUESTION # 182
The figure shows information about an LSP (Link-State PDU) generated by an IS-IS router.
From the LSP, you can infer that the router is not the DIS (Designated Intermediate System) of the local link.
Options:
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding the DIS (Designated Intermediate System) in IS-IS
* In IS-IS, the DIS (Designated Intermediate System) is similar to the DR (Designated Router) in OSPF.
* Unlike OSPF, IS-IS does not use an election based on priority; instead, the router with the highest priority becomes the DIS.
* If there is a tie in priority, the router with the highest MAC address on the interface becomes the DIS.
* The DIS is responsible for generating additional LSPs (pseudonode LSPs) for the link and synchronizing the database between routers.
2. How to Identify If the Router Is the DIS from the LSP
* In the given LSP output, there are NO pseudonode LSPs (LSPs ending with .01).
* The DIS is responsible for creating pseudonode LSPs, which represent a multi-access network in the IS-IS topology.
* If the router were the DIS, it would generate both its own LSP (ending in .00) and a pseudonode LSP (ending in .01).
* Since we only see an LSP ending in .00, this confirms that the router is NOT the DIS.
3. Evaluating the Answer Choices
* Option A (TRUE) - Correct:
* Since no pseudonode LSP is present, the router is not the DIS.
* This confirms that the statement is TRUE.
* Option B (FALSE) - Incorrect:
* If the router were the DIS, it would generate pseudonode LSPs, but they are missing from the output.
* Therefore, the statement is NOT false.
Final Answer:
HCIP-Datacom-Advanced Routing & Switching Technology References:
* IS-IS Designated Intermediate System (DIS) Selection Process
* Pseudonode LSP Generation in Multi-Access Networks
* IS-IS LSP Structure and Identification of DIS
NEW QUESTION # 183
A campus deploys OSPF to implement network interworking. The LSDB of R2 is shown in the figure. From this LSDB. it is possible to What information was obtained?
Answer: A,C
NEW QUESTION # 184
In the figure, a network administrator configures a static LSP to implement MPLS data forwarding. The lower part of the topology shows the packet header information obtained from a device.
Which of the following statements are true?
Options:
Answer: A,B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding the MPLS Data Flow in the Figure
* PC1 (1.1.1.1) sends a ping to PC2 (3.3.3.3).
* The MPLS domain includes R1, R2, and R3.
* R1 pushes an MPLS label onto the packet (Label: 300).
* Packets from PC1 to PC2 are label-switched (MPLS forwarding).
* Packets from PC2 to PC1 do not carry an MPLS label (IP forwarding).
2. Evaluating Each Answer Option
* Option A: " If the device is R3, R3 forwards the packet from PC1 to PC2 over an IP route. "
* Incorrect.
* The packet carries an MPLS label (Label 300) when entering the MPLS domain.
* This means that R3 forwards the packet using MPLS, not a standard IP route.
* If R3 were using an IP route, there would be no MPLS label in the packet.
* Option B: " Packets from PC1 to PC2 are forwarded based on MPLS labels in the MPLS domain. "
* Correct.
* The packet capture shows an MPLS label (Label 300), proving that PC1's traffic is being forwarded using MPLS switching inside the MPLS domain.
* This confirms that MPLS is being used for forwarding in one direction (PC1 # PC2).
* Option C: " Packets from PC2 to PC1 are forwarded based on the IP packet header in the MPLS domain. "
* Correct in concept but incorrect in context.
* The packet capture shows that the return traffic (PC2 # PC1) does not have an MPLS label.
* However, the phrase " in the MPLS domain " makes this statement misleading, as R3 is forwarding based on pure IP routing, not MPLS forwarding.
* Option D: " PC1 pings PC2. "
* Correct.
* The packet capture clearly shows ICMP Echo Request (ping) from PC1 (1.1.1.1) to PC2 (3.3.3.3) and an ICMP Echo Reply from PC2.
* This confirms that PC1 is pinging PC2 successfully.
Final Answer:
# B and D are correct.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* MPLS Label Forwarding and Static LSPs
* MPLS vs. IP Routing in Different Traffic Flows
* Packet Header Analysis in MPLS Networks
NEW QUESTION # 185
A campus has deployed IPv6 for service testing. There are 4 routers (R1, 22, R3 and R4) in this network, running 0SPFV3 to realize the interconnection of IPv6 network. A new router R5 needs to be connected to the network for testing. An engineer introduces a direct route in the OSPFVV3 process of R4 so that devices in the campus network can access the GE0/0/1 port address of R5. Which of the following statements about the scene is true of?
Answer: A,B,C
NEW QUESTION # 186
On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers.
The IPv6 address of Loopback0 on R4 is 2000::4/128.
The command ipv6 summary 2000::/64 level-1-2 is configured in the IS-IS process of R4.
Which of the following statements is false?
Answer: D
NEW QUESTION # 187
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