Route summarization in OSPF is restricted to specific routers: Area Border Routers (ABRs) and Autonomous System Boundary Routers (ASBRs). These devices perform summarization to reduce routing table size and minimize advertised routing information between areas or across AS boundaries. Regular routers cannot perform route summarization, making this statement false .

Comprehensive and Detailed Step-by-Step Explanation:
* IS-IS Three-Way Handshake:
* IS-IS uses a three-way handshake to establish neighbor relationships.
* This process is applied on both point-to-point (P2P) and broadcast network types to confirm bidirectional communication.
* P2P Networks:
* Routers directly exchange IS-IS Hello (IIH) packets to establish adjacency.
* Broadcast Networks:
* IS-IS also uses the three-way handshake on broadcast networks to ensure that the Designated Intermediate System (DIS) election and adjacency formation are correct.
References:
* HCIA-Datacom Study Guide, Chapter: IS-IS Adjacency Establishment
* Huawei IS-IS Network Configuration

Policy-Based Routing (PBR) on interfaces is used to forward traffic based on specific policies rather than the routing table. However, PBR is not suitable for modifying the next-hop of locally originated traffic. Other scenarios listed are typical use cases for interface PBR .

30 seconds
Explanation:
By default, a router interface sends PIM (Protocol Independent Multicast) Hello messages every 30 seconds to maintain neighbor relationships. This interval can be adjusted using configuration commands .

Option B isfalse. By default, when the aggregate command is usedwithout any options, BGP generates asummary route, andsuppresses the specific routesthat fall under that summary. To advertise both specific and summary routes, you mustexplicitly configurethe detail-suppressed option to control whether specifics are suppressed or not.
Explanation of the other options:
Ais correct: When suppress-policy is specified, only specific routes matching the policy are advertised; others are suppressed.
Cis correct: The summary automatic command causes summarization based on classful boundaries, which is a legacy behavior.
Dis correct: With detail-suppressed, only the summary route is advertised, not specific prefixes.
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
"The aggregate command suppresses specific routes by default unless explicitly configured otherwise. Use of suppress-policy or detail-suppressed allows control over which routes are advertised." (Chapter: BGP Advanced Features - Section: Route Aggregation)