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Huawei H12-891_V1.0（HCIE-DATACOM V1.0）認定試験は、大規模なデータ通信ネットワークの設計、展開、および管理を担当するIT専門家のスキルと知識を検証するように設計されています。この認定は、データ通信技術の知識とスキルを向上させたい経験豊富なネットワーク専門家を対象とした高度なレベルの認定です。

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Huawei HCIE-Datacom V1.0 認定 H12-891_V1.0 試験問題 (Q181-Q186):

質問 # 181
As shown in the figure, a sham link is established between PE1 and PE2 through the loopback interfaces. CE2 can learn the 192.168.1.0/24 route (directed route on CE1) through the sham link and backdoor link. If other parameters use their default settings, the cost of the 192.168.1.0/24 route on CE2 should be ______. (Enter an Arabic numeral without symbols.)

正解：

解説：
20This is a classicMPLS L3VPN with OSPF + Sham Linkscenario.Key Components:CE1 to PE1 (GE0/0/0):
OSPF cost = 10CE2 to PE2 (GE0/0/0): OSPF cost = 10PE1 to PE2 via Sham Link (over loopback interfaces) What happens:CE1 advertises192.168.1.0/24to PE1.PE1 redistributes it into theVPNv4 BGProuting table.PE2 learns this route and redistributes it back into OSPF for CE2.Route Options Seen by CE2:Backdoor link (intra- area):CE1 # CE2 directly, via GE0/0/1 on each CE # OSPF cost = 10 + 10 =20Sham Link (inter-area route):
By default, if nosham linkis used, the BGP-learned route is treated as aninter-arearoute by CE2, with a default OSPF cost of1(which would make CE2 prefer this over the real CE-CE backdoor link).Purpose of Sham Link:
Sham linkis configured toequalizeoroverridethe cost of the BGP route so that CE2prefers the backdoor linkor sees both paths equally.In this case, Huawei defaults will cause CE2 to compute the total cost as:PE1-CE1 =
10Sham link route via PE1-PE2-CE2 = also10 (CE1 to PE1) + 10 (PE2 to CE2)=20Final OSPF Cost Calculation at CE2:Route learned via sham link path: 10 (CE1 to PE1) + 10 (PE2 to CE2) =20Correct answer:
20In Huawei MPLS L3VPN OSPF deployment:Asham linkensures that the cost via the MPLS VPN path iscomparable to the real CE-to-CE OSPF backdoor path, preventing suboptimal routing.Without sham link:
BGP redistributed routes appear asinter-area Type 3 LSAswith low cost (usually 1).With sham link: Route appears asintra-areaand OSPF calculates true cost based on interface metrics.
Reference:Huawei HCIE-Datacom V1.0 Study GuideChapter:MPLS L3VPN Integration with OSPFSection:
Sham Link Design and Cost Calculation

質問 # 182
An SRLB is a set of user-specified local labels reserved for SR-MPLS. These labels are locally configured and have only local significance. Therefore, they are not advertised through the IGP.

A. TRUE
B. FALSE

正解：A

解説：
Understanding SRLB (Segment Routing Local Block)
🔹 What is SRLB?
SRLB (Segment Routing Local Block) is a range of local MPLS labels used by Segment Routing (SR-MPLS).
These labels are only relevant to the local router and are not advertised to other routers.
🔹 Key SR-MPLS Label Blocks:
✅ SRGB (Segment Routing Global Block) - Globally significant labels shared among routers.
✅ SRLB (Segment Routing Local Block) - Locally significant labels, not shared.
Why is the Answer TRUE?
✅ SRLB labels are only locally defined and are NOT distributed via IGP (OSPF or IS-IS).
✅ They are used for local forwarding decisions within an SR-enabled router.
✅ Only SRGB labels are advertised to ensure consistent global label assignment.
Real-World Application:
Traffic Engineering (TE): Uses SRLB for custom local path optimizations.
Segment Routing Networks: Ensures scalable MPLS forwarding without requiring full LDP signaling.
✅ Reference: Huawei HCIE-Datacom Guide - Segment Routing Label Blocks (SRGB & SRLB)

質問 # 183
Network administrator A wants to view the BGP peer status of R2. The BGP peer status of R2 is shown in this figure. Obtain the following information: R2 resides in AS _____ (Enter only digits. Do not add punctuations or spaces.)

正解：

解説：
102From the command output:[R2] display bgp group inRemote AS: 102...Type: internal...Peer Members:
10.1.3.3 4 10210.1.4.4 4 10210.1.5.5 4 102Key indicators:"Remote AS: 102""Type: internal"- This tells us that the BGP session isiBGP.IniBGP, both thelocalandremoterouters are in thesame AS.Since all remote peers (10.1.3.3, 10.1.4.4, 10.1.5.5) are inAS 102, and the session type isinternal, that means R2 mustalsobe in AS
102.Correct answer: 102In Huawei BGP implementation:If the BGP peer type is"internal", thelocal router and peer router are in the same AS.TheRemote ASshown in the display bgp group command refers to the AS number configured for the peer.Since the session type isinternal, thelocal AS = remote AS.

質問 # 184
Refer to the following command output on the router R3. Which of the following statements are correct?
< R3 > display interface Tunnel
Tunnel0/0/0 current state : UP
Line protocol current state : UP
Last line protocol up time : 15:21:26 UTC-08:00
Description: HUAWEI, AR Series, Tunnel0/0/0 Interface
Route Port, The Maximum Transmit Unit is 1500
Internet Address is 20.1.1.2/24
Encapsulation is TUNNEL, loopback not set
Tunnel source 10.0.3.3 (LoopBack0), destination 10.0.1.1
Tunnel protocol/transport GRE/IP, key disabled
keepalive disabled
Checksumming of packets disabled

A. The tunnel destination IP address is 10.0.1.1.
B. The tunnel interface MTU is 1500 bytes.
C. The tunnel source IP address is 10.0.1.1.
D. The tunnel interface IP address is 20.1.1.2/24.

正解：A、B、D

解説：
From the output:
Tunnel destination IP address: Clearly shown as destination 10.0.1.1 ## Tunnel interface MTU: Shown as The Maximum Transmit Unit is 1500 ## Tunnel interface IP: Shown as Internet Address is 20.1.1.2/24 ## Tunnel source: Tunnel source 10.0.3.3 (LoopBack0) # Not 10.0.1.1 ## Therefore:
A- Correct
B- Correct
C- Correct
D- Incorrect (confuses destination as source)
Correct answers: A, B, C
Reference:Huawei HCIE-Datacom V1.0 Study Guide -Chapter: GRE TunnelsSection: Tunnel Interface Configuration and Display Output

質問 # 185
The following statement about IPSec VPN is correct ?qo

A. Brutal mode can support NAT traversal, while main mode does not support NAT traversal.
B. The two routers can establish OSPF neighbor relations and exchange intranet routes through the IPSec VPN tunnel
C. Two routers establish an IPSec VPN in brutal mode, so that the two devices can interact with a minimum of 4 messages to establish a tunnel.
D. The two routers establish IPSecVPN in main mode, and from the 5th packet (included), the payload's data will be encrypted.

正解：D

質問 # 186
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