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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Routing Fundamentals | 3% | - Network basics and routing principles |
| Topic 2: Routing and Traffic Control | 10% | - Traffic engineering basics - Policy-based routing |
| Topic 3: OSPF | 16% | - OSPF core concepts - OSPF areas and LSDB |
| Topic 4: Network Security | 9% | - ACL and basic security mechanisms |
| Topic 5: IPv6 | 3% | - IPv6 addressing and routing |
| Topic 6: Network Reliability | 8% | - Redundancy and failover mechanisms |
| Topic 7: Large-scale WLAN Architecture | 6% | - Enterprise WLAN deployment basics |
| Topic 8: IS-IS | 8% | - IS-IS protocol fundamentals |
| Topic 9: Network Solution | 2% | - Integrated network design scenarios |
| Topic 10: Multicast | 9% | - IGMP and PIM concepts |
| Topic 11: Network Service and Management | 2% | - Network management basics |
| Topic 12: Switching Technologies | 7% | - VLAN and STP fundamentals |
| Topic 13: BGP | 17% | - BGP policy and attributes - BGP path selection |
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질문 # 101
On an STP network, the root bridge, root port, and designated port are elected in sequence. The election rules of these ports are different. List the steps for electing the root port in sequence.
정답：
설명：
Explanation:
The sequence of steps for electing the root port in an STP (Spanning Tree Protocol) network is as follows:
* Bridge ID Comparison: The Bridge ID (BID) is compared between the bridges in the network. A smaller value indicates a higher priority, meaning the bridge with the lowest Bridge ID is elected as the root bridge.
* RPC (Root Path Cost) Comparison: The path cost to reach the root bridge is calculated. The router with the lowest Root Path Cost (RPC) to the root bridge will have a higher priority for the election of the root port.
* Peer BID Comparison: If there is a tie in the Root Path Cost, the Peer BID is compared. A smaller Peer BID indicates a higher priority. This step ensures that if two routers have the same RPC, the one with the lower Peer Bridge ID wins.
* Local BID Comparison: If there is still a tie, the Local BID is compared. A smaller Local BID indicates a higher priority. This final step ensures that the router with the lowest local identifier is selected.
* Bridge ID Comparison:The first step in electing the root port is comparing the Bridge IDs. The bridge with the lowest Bridge ID becomes the root bridge. The Bridge ID is made up of the bridge priority and MAC address. The root bridge is the center of the network for STP, and all other ports will calculate their paths based on this root.
* HCIP-Datacom-Core Technology Training Material (STP Concepts and Election Process).
RPC (Root Path Cost) Comparison:Once the root bridge is selected, the network needs to determine the best path to the root. Each port on a non-root bridge will calculate the Root Path Cost (RPC), which is the cumulative cost of reaching the root bridge from that port. The root port is the one that has the lowest RPC, meaning it provides the best path to the root bridge.
Reference: HCIP-Datacom-Core Technology Training Material (STP Path Selection).
Peer BID Comparison:If multiple paths have the same Root Path Cost, the next step is to compare the Peer Bridge IDs. The bridge with the lowest Peer BID is chosen as the root port. This ensures a tie-breaking mechanism based on the neighbor's identifier.
Reference: HCIP-Datacom-Core Technology Training Material (STP Election Process).
Local BID Comparison:If there is still a tie after comparing the Peer Bridge IDs, the Local Bridge ID is compared. A smaller Local BID indicates a higher priority, and the port with the lower Local BID will be selected as the root port.
Reference: HCIP-Datacom-Core Technology Training Material (STP Local Port Selection).
질문 # 102
In the multicast service model, in order to improve security, ASM can configure filtering policies for group sources on the router to allow or prohibit packets from certain multicast sources from passing through.
정답：B
질문 # 103
In IS-IS, NET can be regarded as a special NSAP address, which means that the transmission protocol is IP. That is, the SEL flag of the NET address is fixed to ().
정답：
설명：
3
질문 # 104
When using the Filter-Policy tool in the OSPF view, which of the following tools can be called using the if-match clause? (Multiple choice)
정답：B,C,D
질문 # 105
ACL command ac1 [number] ac1-number [ match-order {autol config}], where ac1-numnbe is used to specify the number of the access control list, and the value range of ac1-number of the basic access control list is ().
정답：B
질문 # 106
......
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