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Difficulty: MediumRouting Concepts and Dynamic Routing Protocols

An enterprise network needs to dynamically exchange routing information and path attributes between its own network infrastructure (Autonomous System 65100) and two distinct Internet Service Providers (AS 100 and AS 200). The solution must support path-vector routing and policy-based decisions across autonomous system boundaries. Which dynamic routing protocol should be implemented?

  1. Border Gateway Protocol (BGP)Answer
  2. B
    Open Shortest Path First (OSPF)
  3. C
    Routing Information Protocol (RIPv2)
  4. D
    Enhanced Interior Gateway Routing Protocol (EIGRP)

Answer

Border Gateway Protocol (BGP) is the correct dynamic routing protocol for exchanging routes between different Autonomous Systems.
Border Gateway Protocol (BGP) is the standard Exterior Gateway Protocol (EGP) used across the internet to exchange routing and reachability information between independent Autonomous Systems (AS). It uses a path-vector routing algorithm and allows administrators to implement detailed routing policies.

Step-by-Step Solution

1
Identify the routing scope from the scenario requirements.
The requirement involves routing between distinct Autonomous Systems (AS 65100, AS 100, and AS 200).
Routing between autonomous systems requires an Exterior Gateway Protocol (EGP), whereas intra-AS routing uses Interior Gateway Protocols (IGPs).
2
Evaluate the path selection mechanism requested.
The protocol must use path-vector metrics and support policy-based path decisions.
Border Gateway Protocol (BGP) utilizes path vectors (such as AS-Path) to prevent routing loops and enforce policy routing across internet boundaries.

Key Concept

Exterior Gateway Protocol (EGP) vs. Interior Gateway Protocol (IGP)
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Topics

Routing Concepts and Dynamic Routing Protocols

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