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| Section | Weight | Objectives |
|---|---|---|
| Advanced BGP Features | 10% | - Route reflectors - BGP route control - Inter-domain routing optimization - Advanced BGP features |
| Network O&M | 7% | - Routine maintenance - Data collection |
| Network Cutover | 7% | - Migration process - Basic cutover concepts |
| Advanced Ethernet Technologies | 10% | - VLANs - Ethernet security |
| IPv6 Routing | 20% | - BGP4+ - OSPFv3 - IPv6 static routes - IS-IS for IPv6 |
| Advanced IGP Features | 17% | - Fast convergence - Route control - OSPF advanced features - IS-IS advanced features |
| MPLS Technologies | 19% | - MPLS configuration - MPLS forwarding - MPLS principles - MPLS VPN applications |
| Network Troubleshooting | 10% | - Troubleshooting methods - Structured troubleshooting processes |
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NEW QUESTION # 169
On the OSPF network shown in the figure, R1 and R2 use OSPF to communicate with each other through Loopback0. In addition:
* MPLS LDP is enabled on R1 and R2.
* The LDP transport address is the IP address of Loopback0.
* A network engineer finds that an LDP session cannot be established between R1 and R2 and runs diagnostic commands (shown in the figure) to locate the fault.
Given this, which of the following are possible causes of the fault?
Options:
Answer: B,C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding MPLS LDP (Label Distribution Protocol)
* LDP (Label Distribution Protocol) runs over TCP port 646.
* LDP uses the transport address (Loopback0 in this case) to establish TCP sessions between neighbors.
* For an LDP session to be established, both routers must:
* Enable LDP on the interface (GE0/0/1).
* Allow TCP traffic on port 646 (used for LDP adjacency formation).
2. Analyzing the Issue and Possible Causes
* The figure shows a successful ping from R2 to R1's Loopback0 (10.0.1.1/32).
* This means basic IP connectivity between R1 and R2 is working.
* OSPF is properly advertising Loopback0 addresses between the routers.
* The problem must be related to LDP itself, not general IP reachability.
3. Evaluating Each Answer Option
* Option A: "R1's GE0/0/1 rejects packets with the destination IP address 10.0.2.2."
* Incorrect.
* The ping test in the figure shows successful replies from 10.0.1.1 to 10.0.2.2, meaning packets to 10.0.2.2 are not being rejected.
* This is NOT the cause of the LDP failure.
* Option B: "MPLS LDP is not enabled on R2's GE0/0/1."
* Correct.
* If LDP is not enabled on R2's GE0/0/1, then R1 and R2 cannot form an LDP session.
* MPLS LDP must be enabled on both interfaces for label exchange.
* This is a valid cause of the issue.
* Option C: "R2's GE0/0/1 rejects packets with TCP destination port 646."
* Correct.
* LDP operates over TCP port 646, so if R2's GE0/0/1 has a firewall or ACL blocking TCP port 646, then LDP will fail.
* Blocking TCP 646 on R2's interface would prevent the session from establishing.
* This is another valid cause of the issue.
* Option D: "R1's GE0/0/1 rejects packets with UDP destination port 646."
* Incorrect.
* LDP does not use UDP; it uses TCP port 646.
* This is not a valid cause of the issue.
Final Answer:
# B and C are correct.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* MPLS LDP Session Establishment and TCP 646 Dependency
* How OSPF Advertises Loopback0 for LDP Transport
* Common LDP Debugging Techniques and ACL Issues
NEW QUESTION # 170
In the OSPP network shown in the figure, area 1 is a Totally NSSA area, area 2 is a common area, and R4 imports the external route 10.0.4.4/32. The Router ID of each device is 10.0.XX, where X is the device number.
in the OSPF processes of R1 and R3. Which of the following descriptions is correct?
Answer: A
NEW QUESTION # 171
In the same environment, engineers A and B execute the tracert command. The destination addresses are the same, but the paths are different. What are the possible reasons?
Answer: D
NEW QUESTION # 172
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 # 173
On a BGP/MPLS IP VPN network, which of the following are carried when a PE advertises VPNv4 routes?
Answer: A,B,C,D
NEW QUESTION # 174
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