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NEW QUESTION # 23
On the IS-IS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. Which of the following routers have the default route in their routing tables?
Answer: A,C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the IS-IS Network Structure in the Question:
* Router Roles & IS-IS Levels:
* R1 and R3 : Level-1 routers.
* R2 : Level-1-2 router (interconnects Level-1 and Level-2 areas).
* R4 : Level-2 router.
* Key Command Used: default-route-advertise always level-1
* This command forces R1 to advertise a default route (0.0.0.0/0) to all Level-1 routers .
* In an IS-IS network:
* Level-1 routers do not see Level-2 routes unless a default route is provided .
* The default route is propagated only within the Level-1 area and does not affect Level-
2 routers unless explicitly redistributed.
Route Distribution Analysis:
* R1 (Level-1) imports the default route and advertises it to all Level-1 routers. # R1 has the default route.
* R3 (Level-1) is in the same Level-1 area as R1, so it receives the default route from R1. # R3 has the default route.
* R2 (Level-1-2) connects Level-1 and Level-2. Since it participates in Level-1, it also learns the default route from R1. # R2 has the default route.
* R4 (Level-2) is not in Level-1 and does not receive the default route unless it is explicitly redistributed from Level-1 to Level-2, which is not stated in the question. # R4 does NOT have the default route.
Final Conclusion:
* R1, R2, and R3 have the default route.
* R4 does not have the default route.
Thus, the correct answer is:
# R1, R2, and R3 have the default route in their routing tables.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - IS-IS Default Route Advertisement Huawei Official HCIP-Datacom Study Guide - IS-IS Level-1 and Level-2 Routing Concepts Huawei Documentation on default-route-advertise always level-1 Command
NEW QUESTION # 24
On an MPLS network, when a transit device receives an MPLS packet and is ready to swap labels, it finds that the label value after swapping is 0. In this case, which of the following operations will the device perform?
Options:
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
* In MPLS (Multiprotocol Label Switching), label 0 is a special label known as the Implicit Null Label.
* If an LSR (Label Switching Router) finds that the label to be swapped is 0, it performs PHP (Penultimate Hop Popping), meaning:# The label is removed (popped) from the MPLS packet.# The IP packet is forwarded to the next hop without an MPLS label.# This optimization reduces label processing overhead at the egress router.
# Reference: HCIP-Datacom Advanced Routing & Switching Technology - MPLS Label Processing & PHP Mechanism
NEW QUESTION # 25
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: A,D
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 # 26
On the network shown in the figure, R1 and R2 cannot establish an EBGP peer relationship through directly connected interfaces. To locate this fault, a network engineer checks BGP configurations on R1 and R2, as shown in the figure. Based on these configurations, it can be determined that the fault cause is the inconsistent router IDs and interface IP addresses.
Answer: B
Explanation:
# BGP Peer Configuration Recap:
* R1 :
plaintext
CopyEdit
bgp 100
router-id 10.0.1.22
peer 10.0.12.2 as-number 200
* R2 :
plaintext
CopyEdit
bgp 200
router-id 10.0.2.1
peer 10.0.12.1 as-number 100
# The BGP peer relationship is being configured over directly connected IPs :
* R1 uses 10.0.12.1
* R2 uses 10.0.12.2
# Is the problem caused by inconsistent router IDs?
* NO. BGP does not require matching router IDs . Router IDs only need to be unique.
* In fact, it ' s normal for router IDs to be different , especially in EBGP.
# Is the problem caused by interface IP mismatch?
* NO. The interface IPs are used correctly :
* R1 peers with 10.0.12.2 (R2's interface)
* R2 peers with 10.0.12.1 (R1's interface)
* They are directly connected
# Conclusion:
There is no issue with router IDs or IPs . The cause of the EBGP peer failure is not due to those fields , so the statement in the question is false .
# Final answer: B. FALSE
Official Huawei Extract:
" BGP router IDs must be unique but do not need to match between peers. For EBGP over directly connected interfaces, the peer IPs must be correct, but differences in router IDs are acceptable. "
- [Huawei HCIA-Datacom Guide - BGP Peer Establishment and Troubleshooting]
NEW QUESTION # 27
When new features are added or the original performance needs to be optimized, or when problems with the current running version need to be solved, the device needs to be upgraded. At this time, a higher version of the system software needs to be loaded and the device needs to be restarted to achieve this. Huawei NetEngine AR series devices use the same software package, such as AR6120, AR6280, and AR6000V.
Answer: B
NEW QUESTION # 28
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