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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Cutover | 7% | - Rollback procedures - Migration planning techniques |
| Topic 2: Troubleshooting | 10% | - Issue resolution strategies - Network diagnostics |
| Topic 3: IPv6 Routing | 20% | - IPv6 static and dynamic routing - OSPFv3/IS-IS for IPv6 |
| Topic 4: MPLS Technologies | 19% | - MPLS VPN basics - MPLS LDP and TE |
| Topic 5: Advanced BGP Features | 10% | - BGP policy controls - Route reflector and attributes |
| Topic 6: Advanced Ethernet Technologies | 10% | - VLAN and Ethernet enhancements - MAC/security features |
| Topic 7: Network O&M | 7% | - Monitoring and health metrics - Operation & maintenance best practices |
| Topic 8: Advanced IGP Features | 17% | - OSPF advanced capabilities - IS-IS advanced optimisations |
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NEW QUESTION # 203
On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers.
The ipv6 default-route-advertise always level-1 command is configured in the IS-IS process of R4.
Which of the following routers does not have the default route in its routing table?
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the IS-IS Network Structure in the Question:
* IS-IS Area IDs and Router Roles
* Area 49.0001 (Level-1-2): Contains R1, R2, R4 (all Level-1-2 routers).
* Area 49.0002 (Level-1-2 & Level-1): Contains R3 (Level-1-2) and R5 (Level-1 only).
* Key Command Used: ipv6 default-route-advertise always level-1
* This command forces R4 to advertise a default route (::/0) to all Level-1 routers within its area.
* Only Level-1 routers in the same area as R4 will receive the default route.
* Level-2 routers do not receive or propagate this default route unless additional configuration is done.
Route Distribution Analysis:
* R4 (Level-1-2) is configured to advertise a default route to Level-1 routers.
* R1 and R2 (both Level-1-2) are in the same area (49.0001) as R4, so they receive the default route.
* R3 (Level-1-2) is in area 49.0002 but connects to R4 (49.0001), meaning it can receive the default route through its Level-1 connection.
* R5 (Level-1 only) is in area 49.0002, but R4 does not propagate the default route to another Level-
1 area (49.0002).
* Since R5 is a Level-1 router and does not have a Level-2 connection, it cannot receive the default route from R4.
Final Conclusion:
# R1 receives the default route.# R2 receives the default route.# R3 receives the default route.# R5 does NOT receive the default route.
Thus, the correct answer is: C. R5.
NEW QUESTION # 204
An administrator runs the display mpls lsp command to view LSPs on a device. The command output is shown in the figure.
Which of the following statements is true ?
Options:
Answer: D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding MPLS Label Forwarding Information
The output of the display mpls lsp command shows the Label Forwarding Information Base (LFIB) used by the router to forward MPLS packets.
Each entry consists of:
* FEC (Forwarding Equivalence Class): The destination IP prefix.
* In Label / Out Label: Incoming label (received) and outgoing label (sent).
* In IF / Out IF: Incoming and outgoing interfaces.
2. Analyzing the Given LSP Table
FEC (Destination IP)
In Label
Out Label
Outgoing Interface
1.1.1.1/32
3
NULL
-
2.2.2.2/32
NULL
3
GE0/0/1
2.2.2.2/32
1026
3
GE0/0/1
3.3.3.3/32
NULL
1027
GE0/0/1
3.3.3.3/32
1027
1027
GE0/0/1
Key Observations:
* NULL means the label is removed (Penultimate Hop Popping - PHP).
* Label 3 is the implicit null label, meaning the label is removed before sending to the next router.
* For destination 3.3.3.3, the router adds label 1027 before forwarding it to GE0/0/1.
3. Evaluating Each Answer Option
* Option A: " Before forwarding a packet destined for 2.2.2.2, the device adds label 3 to the packet.
" # Incorrect.
* The output shows that packets destined for 2.2.2.2 have the NULL (label 3) entry , which means the label is removed before forwarding, not added.
* Option B: " Before forwarding a packet destined for 1.1.1.1, the device adds label 3 to the packet.
" # Incorrect.
* The entry 1.1.1.1 # 3/NULL means the label is removed (PHP) , so the device does not add label 3.
* Option C: " Before forwarding a packet destined for any IP address, the device removes labels from the packet. " # Incorrect.
* The device removes labels only for some destinations (e.g., 1.1.1.1 and 2.2.2.2), but it adds label 1027 for 3.3.3.3 .
* Not all IPs have their labels removed.
* Option D: " Before forwarding a packet destined for 3.3.3.3, the device adds label 1027 to the packet. " # Correct.
* The entry 3.3.3.3 # NULL/1027 means that the router adds label 1027 before forwarding packets to GE0/0/1 .
Final answer:
D: (Before forwarding a packet destined for 3.3.3.3, the device adds label 1027 to the packet).
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Understanding MPLS LDP (Label Distribution Protocol) and LFIB
* Implicit Null (Label 3) and Penultimate Hop Popping (PHP)
* MPLS Label Swapping and Forwarding Process
NEW QUESTION # 205
As shown in the figure, 0SPF is enabled on all interfaces of the router. The cost value of the link is marked in the figure, R2's LoogbackO is advertised by mouth in area 0, then in In area 1, both R2 and R3 transmit the routing information of 10.0.2.2/32 in the form of Typae3 LSA.
Answer: B
NEW QUESTION # 206
On a broadcast network, routers (including non-DIS routers) of the same level on a network segment can establish neighbor relationships. In the implementation of BFD for IS-IS, however, BFD sessions are established only between a DIS and non-DIS routers, not between non-DIS routers.
Answer: B
NEW QUESTION # 207
Regarding the role of ping and tracert, which of the following statements is correct?
Answer: C
NEW QUESTION # 208
......
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