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| Section | Weight | Objectives |
|---|---|---|
| Advanced Ethernet Technologies | 10% | - VLAN aggregation and MUX VLAN - Port isolation and security features - Ethernet link aggregation and reliability - QinQ and VLAN mapping |
| Advanced BGP Features | 10% | - BGP route selection and attributes - Routing policies and filtering - Route reflectors and confederations - BGP multi-homing and load balancing |
| Network Troubleshooting | 10% | - Switching and link fault handling - Performance and service fault resolution - Structured troubleshooting methodology - Routing protocol fault diagnosis |
| IPv6 Routing | 20% | - IPv6 address planning and configuration - OSPFv3 and IS-IS for IPv6 - BGP4+ for IPv6 - Transition mechanisms (dual-stack, tunnel, translation) |
| Network O&M | 7% | - Routine maintenance procedures - Network monitoring and performance analysis - Log and alarm management - Configuration management and backup |
| Advanced IGP Features | 17% | - IS-IS advanced features
|
| MPLS Technologies | 19% | - LDP and RSVP-TE protocols - MPLS VPN (L3VPN, L2VPN) - MPLS OAM and protection - MPLS fundamentals and label distribution |
| Network Cutover | 7% | - Post-cutover validation - Implementation and rollback strategy - Cutover planning and risk assessment - Pre-cutover verification |
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NEW QUESTION # 119
A network engineer discovered that a link failure alarm frequently appeared on the interface of a certain device. The interface is an Ethernet optical port. Which of the following commands can the network engineer use to check the transmit and receive optical power of the interface?
Answer: B
NEW QUESTION # 120
As shown in the figure, SF is enabled on all interfaces of the router, the cost value of the link is marked in the figure, and the Loopback0 interface of R2 is advertised in area 1, then the cost value of R1 reaching 10.0.2.2/32 is?
Answer: D
NEW QUESTION # 121
In the network shown in the figure, R1 and R2 are configured with single-hop BFD detection. The network engineer found that the BFD session was Down, so he queried the BFD-related configurations of R1 and R2. The configuration information has been marked in the figure.
In addition, the network engineer performed the Ping 10.0.12.2 operation on R1, and the output information is shown in the figure.
Based on this, the possible reason for the BFD session going Down is that the packets with UDP port 4784 are rejected.
Answer: B
NEW QUESTION # 122
In the hub-spoke networking shown in the figure, to ensure correct route transmission, an administrator must manually configure the peer 10.1.2.1 _____ command in the IPv4 address family view of the BGP-VPN_out instance on the Hub-PE.
(Enter the answer in lowercase letters only.)
Answer:
Explanation:
next-hop-self
Explanation:
To determine the correct command, we need to analyze BGP behavior in a Hub-Spoke topology and how routes are advertised in MPLS VPN environments.
1. Understanding the Hub-Spoke BGP/MPLS VPN Topology
* The network consists of Hub-PE and Spoke-PE routers, which are MPLS VPN PEs.
* Hub-PE is responsible for distributing routes between Spoke-PE1 and Spoke-PE2.
* Spoke routers do not have direct IBGP peering with each other; instead, they rely on the Hub-PE to relay routes.
* BGP next-hop handling is critical for proper route advertisement.
2. Why is the " next-hop-self " Command Required?
* By default, when BGP advertises a route, the next-hop remains unchanged (i.e., the original next-hop is retained).
* In Hub-Spoke topology, Spoke routers would receive routes with a next-hop IP that belongs to another Spoke-PE, which is not reachable directly.
* To solve this issue, we use the next-hop-self command on the Hub-PE, so that:
* Hub-PE updates the next-hop to its own address before advertising routes to the Spoke-PEs.
* This ensures that Spoke-PE routers use the Hub-PE as the next-hop, making routes reachable and preventing blackholing.
3. Correct Command Usage
The administrator must run the following command under the BGP IPv4 address family of the BGP-VPN_out instance on Hub-PE:
shell
CopyEdit
peer 10.1.2.1 next-hop-self
This ensures that the next-hop for advertised routes is changed to the Hub-PE ' s IP, allowing proper route transmission in the Hub-Spoke MPLS VPN environment.
NEW QUESTION # 123
On the network shown in the figure, IS-IS IPv6 runs on R2, R6, and R3, and the IPv6 address of Loopback0 on R6 is 2000::6/128. OSPFv3 runs on other links. Area 1 is a stub area, and area 2 is an NSSA. ISIS routes are imported to OSPFv3 on R2 and R3. Which of the following methods can enable R4 to ping 2000: :6?
Answer: A,B,C,D
Explanation:
All four methods can provide the required return path. R2 and R3 import the IS-IS route 2000::6/128 into OSPFv3, allowing R4's Echo Request to reach R6. The remaining requirement is a route on Level-1 router R6 for returning the Echo Reply toward R4, because the OSPFv3 routes are not imported back into IS-IS.
The command:
ipv6 default-route-advertise always level-1
unconditionally originates an IPv6 default route in a Level-1 LSP. Configuring it on either R2 or R3 enables R6 to install ::/0 through that router.
The alternative command:
attached-bit advertise always
forces a Level-1-2 router to set the ATT bit in its Level-1 LSP. When Level-1 router R6 receives an LSP with ATT set, it creates a default route toward the advertising Level-1-2 router. Both R2 and R3 are Level-1-2 routers and participate in the OSPFv3 domain, so either can forward R6's return traffic toward R4.
Thus, either default-route mechanism can be configured on either R2 or R3, making all four options valid.
Huawei IS-IS command reference
NEW QUESTION # 124
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