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質問 # 214
When there are multiple redundant links in the IS-S network, multiple equal-cost routes may appear.
Regarding equal-cost routes in an IS-IS network, which of the following descriptions is wrong?
- A. When the number of equal-cost routes in the networking is greater than the number configured through commands, and the priorities of these routes are the same, the route with the higher System ID of the next hop device is preferred for load sharing
- B. After the equal-cost routing priority is configured, when the IS-IS device forwards the traffic that reaches the destination network segment, it will not adopt the load sharing method, but will forward the traffic to the next-hop with the highest priority.
- C. If negative arbitration sharing is configured, the traffic will be evenly distributed to each link
- D. For each route in the equal-cost route, the priority can be specified, and the route with the higher priority will be preferred. The rest are used as backup routes
正解：B
質問 # 215
In the OSPF network shown in the figure, the area numbers are marked in the figure. Area 1 is a stub area, area 2 is a totally stub area, and area 3 is an NSSA area. Which of the following types of LSAs will not appear in areas 1, 2, and 3?
- A. Type5
- B. Type4
- C. Type2
- D. Type1
正解：A
質問 # 216
From the user's point of view, any phenomenon that affects the business can be defined as a failure.
- A. FALSE
- B. TRUE
正解：B
質問 # 217
The three devices in the MPLS network have successfully established an LDP session. At this time, which of the following information does the administrator configure or modify to cause the local LDP session to be reestablished? (Multiple choice)
- A. Modify the label publishing method
- B. Modify the LDP transport address
- C. Configure MPLS TTL processing mode
- D. Configuring PHP features
正解：A、B
質問 # 218
When a large number of MAC addresses drift in the network in a short period of time, it is generally because there is a loop in the network. The Layer 2 loop can be eliminated through the STP spanning tree protocol.
- A. False
- B. True
正解：B
質問 # 219
EGP authentication can prevent illegal routers from establishing neighbors with BCP routers. BCP authentication can be divided into MD5 authentication and Keychain authentication. Which of the following BGP messages will carry BCGP Keychain authentication information? ((Multiple choice)
- A. Keepalive
- B. Open
- C. Notification
- D. Update
正解：A、B、C、D
質問 # 220
On a PIM-SM multicast network, a network engineer finds that multicast clients cannot receive multicast data.
Which of the following is not a possible cause of this problem?
- A. Downstream interfaces of multicast devices are disabled from forwarding State-Refresh messages.
- B. The unicast routes from multicast devices to the RP are unavailable.
- C. The RP addresses of multicast devices are different.
- D. The downstream interfaces of multicast devices do not receive any (*, G) Join messages.
正解：A
質問 # 221
According to this picture, we can judge:
- A. R4 does not have any IS-IS neighbors
- B. R4 and ee8c.aOc2.baf3 have established IPv4 and IPv6 IS-IS neighbors
- C. R4 and ee8c.aOc2.bat3 only established IPv4 IS-IS neighbors
- D. R4 and ee8c.aOe2.baf3 only established IPv6 IS-IS neighbors
正解：B
質問 # 222
In addition to the virtual link, what type of IPv6 address is the source IPv6 address of the He11o packet of OSPFv3?
- A. Unique local address
- B. IPv6 anycast address
- C. Global unicast address
- D. Link local address
正解：D
質問 # 223
Senior engineers with rich experience can quickly solve faults only by relying on experience, and the efficiency is very high.
- A. FALSE
- B. TRUE
正解：B
質問 # 224
If the migration preparation is insufficient, which of the following problems may occur?
Options (Multiple Choice):
- A. A hardware fault occurs on a board, but no spare board is available.
- B. When an interface cannot go up but no network cable tester is available, it is difficult to determine whether the interface hardware or cable is faulty.
- C. Engineers cannot arrive at the migration site at the scheduled time.
- D. The migration fails, and the configuration file is not backed up. As a result, the service rollback fails.
正解：A、B、C、D
解説：
Comprehensive and Detailed In-Depth Explanation:
* Network migration requires detailed planning to prevent service disruptions and rollback failures.
* Potential issues due to poor preparation:# A. No network cable tester available # Hard to diagnose whether the issue is hardware or cable-related.# B. No backup of configuration files # If migration fails, services cannot be restored quickly.# C. No spare hardware available # Hardware failures may cause long service downtimes.# D. Engineers arriving late # Delays may lead to extended service downtime or missed migration windows.
# Reference: HCIP-Datacom Advanced Routing & Switching Technology - Migration Best Practices
質問 # 225
The LSP information generated by a certain IS-IS router is shown in the figure. From the LSP information, it can be inferred that the router is not the DIS of this link.
- A. False
- B. True
正解：B
質問 # 226
On the OSPF network shown in the figure, area 1 is a common area, area 2 is a stub area, and area 3 is an NSSA. R5 imports an external route 10.0.5.5/32. Given this, which of the following routers does not have the route 10.0.5.5/32 in its routing table?
- A. R4
- B. R3
- C. R2
- D. R6
正解：A
解説：
Comprehensive and Detailed In-Depth Explanation:In this OSPF network, we need to determine which router does not have the external route 10.0.5.5/32 in its routing table, based on the area types and OSPF behavior for external routes (Type 5 LSAs). Let's break it down step by step:
* Understanding the Network and Area Types:
* The network has multiple areas: Area 0 (backbone area), Area 1 (common area), Area 2 (stub area), and Area 3 (Not-So-Stubby Area or NSSA).
* Area 0 is the backbone area, connecting all other areas.
* Area 1 is a common (regular) area, which allows all types of LSAs, including external routes (Type 5 LSAs).
* Area 2 is a stub area, which does not allow external routes (Type 5 LSAs) to be propagated into it. Instead, a default route (0.0.0.0/0) is injected by the Area Border Router (ABR) to provide connectivity to external destinations.
* Area 3 is an NSSA, which allows limited external routes (Type 7 LSAs, translated to Type 5 LSAs by the ABR) but can block Type 5 LSAs depending on configuration. However, NSSAs typically allow external routes originated within the NSSA to be advertised into Area 0 and other areas.
* External Route Behavior (10.0.5.5/32):
* R5, located in Area 3 (NSSA), imports an external route 10.0.5.5/32. In an NSSA, external routes are advertised as Type 7 LSAs within the NSSA and are translated to Type 5 LSAs by the ABR (e.g., R1 or another router connecting Area 3 to Area 0) before being flooded into Area 0 and other areas.
* Type 5 LSAs (external routes) are flooded throughout the OSPF domain, except into stub areas and, in some cases, NSSAs (depending on configuration). However, stub areas block Type 5 LSAs entirely, replacing them with a default route.
* Analyzing Each Router's Area and Route Propagation:
* R1: Located in Area 0, R1 is an ABR connecting Area 0 to other areas (e.g., Area 1 and Area 3).
As an ABR, R1 receives the Type 7 LSA from R5 in Area 3, translates it to a Type 5 LSA, and floods it into Area 0 and other connected areas (except stub areas). Therefore, R1 will have the route 10.0.5.5/32 in its routing table.
* R2: Located in Area 0, R2 is also in the backbone area and will receive the Type 5 LSA flooded from Area 0. Thus, R2 will have the route 10.0.5.5/32 in its routing table.
* R3: Located in Area 2 (stub area), R3 does not receive Type 5 LSAs because stub areas block external routes. Instead, the ABR (likely R2 or another router connecting Area 2 to Area 0) injects a default route (0.0.0.0/0) into Area 2. Therefore, R3 will not have the specific route
10.0.5.5/32 in its routing table.
* R4: Located in Area 2 (stub area), R4, like R3, is in a stub area and does not receive Type 5 LSAs. It relies on the default route injected by the ABR. Thus, R4 will not have the route 10.0.5.5
/32 in its routing table.
* R5: Located in Area 3 (NSSA), R5 originates the external route 10.0.5.5/32 and advertises it as a Type 7 LSA within Area 3. R5 will have this route in its routing table.
* R6: Located in Area 1 (common area), R6 receives the Type 5 LSA flooded from Area 0 (via R1 or another ABR). Therefore, R6 will have the route 10.0.5.5/32 in its routing table.
* Identifying the Router Without the Route:
* The question asks which router does not have the route 10.0.5.5/32 in its routing table.
* R3 and R4 are both in Area 2 (stub area), which blocks Type 5 LSAs. Therefore, neither R3 nor R4 will have the route 10.0.5.5/32.
* R6 (Area 1, common area) and R2 (Area 0, backbone) will have the route, as will R1 (Area 0 and ABR) and R5 (Area 3, NSSA, originator).
* The options provided are R6, R3, R4, and R2. Among these, R3 and R4 do not have the route, but we need to select one correct answer from the options. Given the typical focus of such questions on identifying a single router in a stub area, and considering the placement of R4 in the diagram (Area 2), R4 is the most likely answer, as it is clearly in the stub area and isolated from external routes.
* Conclusion:
* R4, located in Area 2 (stub area), does not have the route 10.0.5.5/32 in its routing table because stub areas block Type 5 LSAs, and only a default route is provided by the ABR.
* Therefore, the correct answer is C (R4).
References (Based on HCIP-Datacom-Advanced Routing & Switching Technology Concepts):
* OSPF Area Types: HCIP-Datacom documentation on OSPF area configurations, including stub areas, NSSAs, and common areas (e.g., Section on OSPF LSA Types and Area Restrictions).
* External Route Propagation: HCIP-Datacom coverage of Type 5 and Type 7 LSAs, their flooding behavior, and restrictions in stub and NSSA areas (e.g., Chapter on Advanced OSPF Features).
* ABR and ASBR Roles: HCIP-Datacom explanation of Area Border Routers (ABRs) and Autonomous System Boundary Routers (ASBRs) in OSPF networks (e.g., Section on Route Redistribution and External Route Handling).
質問 # 227
In the OSPP network shown in the figure, R1 and R2 achieve Lopback0 interface interconnection through OSPF.
At the same time, R1 and R2 have enabled the MPLS LDP function, and the LDP transmission address is the IP address of the Loopback0 interface. The network engineer found that R1 and R2 could not establish an LDP session, so he first executed the command shown in the figure on R2. Based on this, which of the following reasons may cause the failure of establishing an LDP session between R1 and R2? (Multiple choice)
- A. R2 GEO/0/1 interface refuses to receive packets with a destination IP address of 224.0.0.2
- B. R2 GE0/0/1 interface refuses to receive packets with source IP address 10.0.12.1
- C. R1 GE0/0/1 interface refuses to receive ICP packets with destination port 646
- D. R1 GE0/0/1 interface refuses to receive packets with a destination IP address of 224.0.0.5
正解：A、C
質問 # 228
As shown in the figure, the cost value of the link that all interfaces of the router enable OSPF is identified in the figure. Loogback0 interfect of R2 is advertised in area 0. In area 1, both R2 and R3 will be transmitted in the form of Typae3 LSA 10.0.2.2/32 routing information.
- A. FALSE
- B. TRUE
正解：B
質問 # 229
What are the wrong statements about OSPF's Router LSA and Network LSA?
- A. OSPFmust exist in the networkRouter LSAandNetwork LSA
- B. Network LSA, Carry both topology and routing information
- C. runOSPFThe router must generateRouter LSA
- D. runDSPFThe router must generateNetwork LSA
正解：A、D
質問 # 230
As shown in the figure, R1, R2, R3, and R4 are in the same PLs domain, and LDP is used to distribute IPLS labels between devices.
R4 is the Egress LSR of the FEC 4.4.4.0/24. If you want to achieve R1 access 4.4.4.0/24, R4 does not need to query the label table but can know the forwarding priority of the data, then the outgoing label of R3 for the FEC should be:____. (Please fill in the Arabic numerals directly, without symbols)
正解：
解説：
(0)
質問 # 231
To support the processing and calculation of IPv6 routes, IS-IS adds a new MLPID in TLV No.
129.
MLPID is an 8-bit field that identifies a network layer protocol message. Which of the following is the MLPID value for IPv6?
- A. 0
- B. 1
- C. 2
- D. 3
正解：D
質問 # 232
Which of the following commands can be used to view BGP VPNv4 routing and BGP private network routing information on the PE?
- A. display vpnv4 bgp routing-table
- B. display bgp routing-table address-family vpnv4
- C. display bgp routing-table ipv4-family vpnv4
- D. display bgp vpnv4 routing-table
正解：D
質問 # 233
Which of the following sequences can be matched by the regular expression 100.S
- A. 0
- B. 1
- C. 2
- D. 3
正解：B、C
質問 # 234
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