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NEW QUESTION # 109
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: A,B
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 # 110
According to this picture, you can judge
Answer: A,C
NEW QUESTION # 111
Regarding the IPSG, which of the following statement is incorrect?
Answer: B
NEW QUESTION # 112
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.
Options:
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
* The clock timezone command only affects the displayed time on the device and does not impact routing protocol operations.
* Dynamic routing protocols such as OSPF, IS-IS, BGP, and EIGRP rely on timers, authentication, and correct network configurations, but they do not require the same time zone settings.
* Potential issues with different time zones:# Log timestamps may be inconsistent, making troubleshooting harder.# Time-sensitive features like NTP synchronization might be affected.# But different time zones will not prevent dynamic routing neighbor relationships.
# Reference: HCIP-Datacom Advanced Routing & Switching Technology - System Time Configuration
& Routing Protocols
NEW QUESTION # 113
As shown in the figure, an administrator enables port isolation on the switch's interfaces connected to terminals.
In this scenario, which of the following IP addresses cannot be pinged from PC1?
Answer: B,C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding Port Isolation in the Network
* Network Setup Details:
* The switch is Layer 3, with VLANIF10 configured as 10.1.1.1/24 (gateway for all PCs).
* All PCs are in VLAN 10 and use 10.1.1.1 as the default gateway.
* Port isolation is enabled on switch interfaces, dividing them into two groups:
* Group 1 (PC1 & PC2): GigabitEthernet0/0/1 and GigabitEthernet0/0/2
* Group 2 (PC3 & PC4): GigabitEthernet0/0/3 and GigabitEthernet0/0/4
* Port Isolation Behavior:
* Ports within the same isolation group CAN communicate with each other.
* Ports from different isolation groups CANNOT communicate directly.
* All devices CAN still communicate with the L3 switch (10.1.1.1), which acts as the gateway.
Ping Analysis from PC1 (10.1.1.2)
Destination IP
Device
Connected Port
Isolation Group
Ping Result from PC1
10.1.1.3
PC2
GigabitEthernet0/0/2
Group 1
# Can Ping
10.1.1.4
PC3
GigabitEthernet0/0/3
Group 2
# Cannot Ping
10.1.1.5
PC4
GigabitEthernet0/0/4
Group 2
# Cannot Ping
10.1.1.1
L3 Switch (Gateway)
N/A
Not Isolated
# Can Ping
Which IPs Cannot be Pinged from PC1?
* PC3 (10.1.1.4) and PC4 (10.1.1.5) are in a different isolation group (Group 2), so PC1 cannot reach them directly.
* PC2 (10.1.1.3) is in the same isolation group (Group 1), so PC1 can ping it.
* PC1 can ping the gateway (10.1.1.1) because the switch is Layer 3 and forwards traffic.
Thus, the correct answers are: A. 10.1.1.3 and D. 10.1.1.4.
Final Conclusion:
# PC1 CAN ping:
* 10.1.1.3 (PC2, same isolation group)
* 10.1.1.1 (Gateway, L3 Switch)
# PC1 CANNOT ping:
* 10.1.1.4 (PC3, different isolation group)
* 10.1.1.5 (PC4, different isolation group)
Thus, the correct answer is: A. 10.1.1.3 and D. 10.1.1.4.
NEW QUESTION # 114
......
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