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352-001 · Question #800

Which statement about hot-potato routing architecture design is true?

The correct answer is A. Hot-potato routing is the preferred architecture when connecting to content providers. Hot-potato routing is the practice of exiting an AS through the nearest egress point, which is preferred when connecting to content providers to minimize internal network resource consumption.

Layer 3 Control Plane

Question

Which statement about hot-potato routing architecture design is true?

Options

  • AHot-potato routing is the preferred architecture when connecting to content providers
  • BHop-potato keeps traffic under the control of the network administrator for longer
  • COSPF uses hot-potato routing if all ASBRs use the same value for the external metric
  • DHot-potato routing is prone to misconfiguration as well as poor coordination between two networks

How the community answered

(23 responses)
  • A
    52% (12)
  • B
    9% (2)
  • C
    22% (5)
  • D
    17% (4)

Why each option

Hot-potato routing is the practice of exiting an AS through the nearest egress point, which is preferred when connecting to content providers to minimize internal network resource consumption.

AHot-potato routing is the preferred architecture when connecting to content providersCorrect

Hot-potato routing hands off traffic to the peer AS at the closest possible exit point, reducing the distance and resources traffic consumes within the local network, which is ideal when connecting to content providers who can then carry the traffic efficiently on their own infrastructure.

BHop-potato keeps traffic under the control of the network administrator for longer

Hot-potato routing does the opposite - it minimizes the time traffic stays under the local network administrator's control by exiting the AS as early as possible; cold-potato routing is the strategy that retains traffic longer.

COSPF uses hot-potato routing if all ASBRs use the same value for the external metric

OSPF external metric values influence route selection within an AS but do not define hot-potato routing, which is a BGP and inter-AS traffic engineering philosophy, not an OSPF-specific behavior.

DHot-potato routing is prone to misconfiguration as well as poor coordination between two networks

Hot-potato routing is a deliberate and well-understood inter-domain routing strategy; while it requires coordination, it is not inherently more prone to misconfiguration than other routing architectures.

Concept tested: Hot-potato vs cold-potato BGP routing design

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/bgp-best-path-selection-algorithm.html

Topics

#hot-potato routing#BGP routing policy#inter-AS routing#traffic architecture

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