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Difficulty: MediumRouting Concepts and Dynamic Routing Protocols

A network administrator is categorizing dynamic routing protocols based on administrative distance and metric calculations for an enterprise baseline audit. Match each dynamic routing protocol on the left with its corresponding default administrative distance and primary metric characteristics on the right.

  • OSPF (Open Shortest Path First)Default Administrative Distance of 110; uses cost derived from interface bandwidth.
  • RIPv2 (Routing Information Protocol version 2)Default Administrative Distance of 120; uses hop count (limit of 15).
  • Internal EIGRP (Enhanced Interior Gateway Routing Protocol)Default Administrative Distance of 90; uses a composite metric based on bandwidth and delay.
  • eBGP (External Border Gateway Protocol)Default Administrative Distance of 20; uses path attributes such as Autonomous System (AS) path.

Answer

OSPF pairs with Default Administrative Distance 110 (cost based on bandwidth); RIPv2 pairs with Default Administrative Distance 120 (hop count); Internal EIGRP pairs with Default Administrative Distance 90 (composite bandwidth/delay metric); eBGP pairs with Default Administrative Distance 20 (path attributes).
Each routing protocol is accurately matched to its standard administrative distance hierarchy and path selection metric calculation method: eBGP (20, AS-Path), Internal EIGRP (90, composite bandwidth/delay), OSPF (110, cost/bandwidth), and RIPv2 (120, hop count).

Step-by-Step Solution

1
Identify administrative distance and metric type for OSPF.
OSPF has an AD of 110 and uses bandwidth-derived cost.
OSPF link-state calculations evaluate cumulative cost based on interface reference bandwidth.
2
Identify administrative distance and metric type for RIPv2.
RIPv2 has an AD of 120 and relies on hop count (max 15).
As a distance-vector protocol, RIP uses simple hop counts up to 15.
3
Identify administrative distance and metric type for Internal EIGRP.
Internal EIGRP has an AD of 90 and uses composite bandwidth and delay.
EIGRP assigns an AD of 90 for internal routes and uses K-values (bandwidth and delay by default).
4
Identify administrative distance and metric type for eBGP.
eBGP has an AD of 20 and uses path attributes like AS-Path.
External BGP routes take high trustworthiness priority (AD 20) over internal dynamic routing protocols when selecting paths across autonomous systems.

Key Concept

Administrative Distance and Metric Properties of Dynamic Routing Protocols
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Topics

Routing Concepts and Dynamic Routing Protocols

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