Root protection ensures that a designated port does not become a root port by discarding superior BPDUs.
However, if superior BPDUs are no longer received, the port can return to its original forwarding state, meaning its role can change. This makes option B incorrect, while the other options correctly describe RSTP behavior .

Explanation:
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Comprehensive and Detailed Step-by-Step Explanation:
1. How Firewalls Match Security Policies:
Firewalls usesecurity policiesto define rules for filtering traffic.
Each policy containsmatching conditions(e.g., source IP, destination IP, protocol, etc.) and anaction(e.g., permit or deny).
Traffic is evaluated against these policies in sequential order, and the first matching policy is applied.
2. Analysis of Each Statement:
Option A: Multiple values can be configured for a single matching condition, and the values are logically ANDed.
Incorrect.
Multiple values for a single matching condition (e.g., multiple source IPs) are logicallyORed, not ANDed. For example, traffic from any of the specified source IPs matches the policy.
Option B: If a security policy contains multiple matching conditions, the relationship between them is AND.
Correct.
When a policy has multiple matching conditions (e.g., source IP AND destination IP AND protocol), all conditions must be met for the policy to match.
Option C: The system has a default security policy named default, where all matching conditions are any and the default action is permit.
Incorrect.
The default security policy typically denies all traffic unless explicitly permitted by user-defined policies.
Option D: When multiple security policy rules are configured, they are sorted in a list by configuration sequence by default. A security policy rule configured earlier is placed higher in the list and has a higher priority.
Correct.
Security policies are processed in sequential order based on their configuration sequence. Policies configured earlier have higher priority and are evaluated first.
3. Summary:
The correct statements areBandD.
Reference:
Huawei HCIA-Datacom Study Guide, Chapter "Firewall Security Policy Matching."

OSPF (Open Shortest Path First) mandates that the backbone area (Area 0) serves as the central area for routing information exchange. To avoid inter-area routing loops, routing information is only exchanged between the backbone area and non-backbone areas, not directly between two non-backbone areas.
Consequently, each Area Border Router (ABR) must connect to the backbone area to facilitate this routing exchange .

Comprehensive and Detailed Step-by-Step Explanation:
* Distance-Vector Protocols:
* Distance-vector protocols determine the best path based on the distance to a destination and periodically share the entire routing table with neighbors.
* Example: RIP is a distance-vector protocol.
* Link-State Protocols:
* Link-state protocols share information about directly connected links, enabling routers to build a complete map of the network.
* OSPF (Open Shortest Path First) and IS-IS (Intermediate System to Intermediate System) are link-state protocols that use Dijkstra's algorithm to calculate the shortest path.
* Border Gateway Protocol (BGP):
* BGP is neither a distance-vector nor a link-state protocol. Instead, it is classified as a path-vector protocol that selects the best path based on attributes such as AS-path, next-hop, and local preference.
References:
* HCIA-Datacom Study Guide, Chapter: Routing Protocol Basics
Huawei Networking Fundamentals, Section: Classification of Routing Protocols