In EPIM-SM, the following description of the PIM Join message is correct?
Correct Answer: B
Question 192
Which of the following statements about BGP EVPN principles are correct in a scenario where a VXLAN tunnel is dynamically established through BGP EVPN?
Correct Answer: A,B,D
BGP EVPN in VXLAN Tunneling # A. MP_REACH_NLRI is used to carry routing information. * MP_REACH_NLRI (Multiprotocol Reachable Network Layer Reachability Information) is used in BGP updates to carry VXLAN reachability information. # B. Several BGP EVPN routes are defined through BGP extension. * BGP EVPN introduces multiple route types, such as Type 2 (MAC/IP Advertisement), Type 3 (Inclusive Multicast), and Type 5 (IP Prefix Advertisement). # D. MP_REACH_NLRI is used to carry the RT. * RT (Route Target) defines route import/export policies in VPN environments. * MP_REACH_NLRI carries the RT attribute in BGP EVPN updates. # Incorrect answer:# C. MP_REACH_NLRI is used to carry the RD. * Wrong! The Route Distinguisher (RD) is carried inside BGP attributes, but not in MP_REACH_NLRI. Reference from Huawei HCIE-Datacom Documentation: * Huawei VXLAN BGP EVPN Configuration Guide - BGP EVPN Route Types * HCIE-Datacom Training Material - VXLAN Dynamic Tunnel Establishment
Question 193
For the description of firewall security zones, the following statement is correct?
Correct Answer: C
Question 194
iMaster NCE-Campus restricts RESTful APIs. If a client sends aGET requestthat invokes a RESTful API to obtain site information from iMaster NCE-Campus, which of the following fields should be included in the request header?
Correct Answer: A
Comprehensive and Detailed In-Depth Explanation: When invokingRESTful APIsiniMaster NCE-Campus, the client must include theACCESS-TOKENin therequest headerto authenticate the request. TheACCESS-TOKENis obtained throughauthenticationand is required forAPI access control. The correct format in the HTTP header is: Authorization: Bearer ACCESS-TOKEN Other formats likeACCEPT-TOKEN,X-ACCEPT-TOKEN, andX ACCESS TOKENare not recognized or valid foriMaster NCE-Campus API requests. Therefore, the correct answer isA.
Question 195
What can be determined from the following figure?
Correct Answer: C
To determine R3's role (Level-1, Level-2, or Level-1-2) based on the provided output of the display ipv6 routing-table protocol isis command on R3, we need to analyze the IS-IS routing information and understand IS-IS hierarchy and behavior, particularly in the context of IPv6 routing. Let's break it down step by step: * Understanding the IS-IS Levels and Hierarchy: * IS-IS (Intermediate System to Intermediate System) is a link-state routing protocol that supports a two-level hierarchy: * Level-1: Routers within the same area, responsible for intra-area routing. Level-1 routers only maintain routing information for their area and rely on Level-1-2 routers to reach other areas. * Level-2: Routers that form the backbone, connecting different areas for inter-area routing. Level-2 routers maintain routing information across areas. * Level-1-2: Routers that operate both at Level-1 (within their area) and Level-2 (to connect to other areas). These routers act as boundary routers between Level-1 areas and the Level- 2 backbone. * A router's role (Level-1, Level-2, or Level-1-2) determines which types of adjacencies it can form and what routing information it advertises or receives. * Analyzing the Output: * The output shows R3's IPv6 routing table with routes learned via IS-IS, specifically: * Destination: 2082:EDFC:DDCC::B824:0/127, Protocol: ISIS-L1 * This route is learned via IS-IS Level-1 (ISIS-L1), indicating that R3 has a Level-1 adjacency and is receiving or advertising routes within its area. * The next hop (FE80::2E0:FCFF:FE45:6A3E) and interface (GigabitEthernet0/0/0) suggest this route is intra-area. * Destination: 2082:EDFC:DDCC::B891:0/127, Protocol: ISIS-L2 * This route is learned via IS-IS Level-2 (ISIS-L2), indicating that R3 has a Level-2 adjacency and is receiving or advertising routes for inter-area or backbone routing. * The next hop (FE80::2E0:FCFF:FE50:406F) and interface (GigabitEthernet0/0/1) suggest this route is for a different area or the backbone. * Both Level-1 and Level-2 routes are present in R3's routing table, which provides critical insight into R3's role. * Determining R3's Role: * Level-1 Routers: * Level-1 routers only participate in Level-1 adjacencies and maintain routing information for their area. They do not have Level-2 routes or adjacencies unless connected to a Level- 1-2 router. Since R3 has a Level-2 route (ISIS-L2), it cannot be exclusively a Level-1 router. * Level-2 Routers: * Level-2 routers focus on inter-area routing and typically do not maintain Level-1 routes unless they are also configured as Level-1-2. Since R3 has a Level-1 route (ISIS-L1), it cannot be exclusively a Level-2 router. * Level-1-2 Routers: * Level-1-2 routers operate both at Level-1 (for intra-area routing) and Level-2 (for inter-area routing). They can form adjacencies with both Level-1 and Level-2 neighbors and maintain both types of routes. The presence of both ISIS-L1 and ISIS-L2 routes in R3's routing table indicates that R3 is participating in both Level-1 and Level-2 adjacencies, making it a Level-1-2 router. * Evaluating Each Option: * A. R3 must be a Level-2 device. * This is incorrect because R3 has ISIS-L1 routes, indicating it is also participating in Level- 1 adjacencies, which Level-2-only devices do not do. Level-2 devices focus solely on inter- area routing and do not maintain Level-1 routes. * B. The device role of R3 cannot be determined. * This is incorrect because the presence of both ISIS-L1 and ISIS-L2 routes in the routing table clearly indicates R3's role. The combination of Level-1 and Level-2 routes confirms R3 is a Level-1-2 router. * C. R3 must be a Level-1-2 device. * This is correct. The routing table shows both ISIS-L1 (Level-1) and ISIS-L2 (Level-2) routes, meaning R3 is operating as both a Level-1 and Level-2 router, which defines a Level-1-2 device. * D. R3 must be a Level-1 device. * This is incorrect because R3 has ISIS-L2 routes, indicating it is also participating in Level- 2 adjacencies, which Level-1-only devices do not do. Level-1 devices only maintain intra- area routes and rely on Level-1-2 routers for inter-area reachability. * Additional Considerations: * The Flags: D in the output typically indicates a directly connected route or a route downloaded to the forwarding table, but it does not affect the determination of R3's IS-IS level. * The preference (15) and cost (20) are standard for IS-IS routes and do not impact the level determination. * In Huawei's IS-IS implementation, routers can be configured explicitly as Level-1, Level-2, or Level-1-2 using commands like isis level-1-2 under the IS-IS process. The presence of both Level-1 and Level-2 routes confirms R3's configuration as Level-1-2. * Huawei HCIE-Datacom Context: * According to Huawei HCIE-Datacom documentation, IS-IS routers can operate at different levels, and the routing table's protocol type (ISIS-L1 or ISIS-L2) indicates the level of adjacency. A router with both Level-1 and Level-2 routes is necessarily a Level-1-2 device, as it participates in both intra-area and inter-area routing. * The display ipv6 routing-table protocol isis command on Huawei devices shows routes learned via IS-IS, and the protocol type (L1 or L2) directly reflects the router's role in the IS-IS hierarchy. * Conclusion: * Based on the presence of both ISIS-L1 and ISIS-L2 routes in R3's IPv6 routing table, R3 must be a Level-1-2 device, as it is participating in both Level-1 (intra-area) and Level-2 (inter-area) adjacencies. Therefore, the correct answer is C. References to Huawei HCIE-Datacom Documents: * Huawei HCIE-Datacom V1.0 Training Material, Chapter on IS-IS Configuration and Hierarchy. * Huawei NE Series Router Configuration Guide, IS-IS Section (Level-1, Level-2, and Level-1-2 Operations). * Huawei Technical Whitepaper on IS-IS Protocol, discussing IPv6 Routing and Level Determination.
