TestOut Network Pro: 7.2 Routing Protocols

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Questions and Answers

How does a distance vector routing protocol differ from a link state routing protocol?

The distance vector protocol shares its entire routing table with neighbors at every update, while the link state protocol shares information about its own routes and only changes.

How are routing paths shared by distance vector routing protocols?

Routing paths are shared via hop count.

How are routing paths shared by link state routing protocols?

Routing paths are shared via relative link cost for the metric.

What is a hybrid routing protocol?

<p>A hybrid routing protocol combines the distance vector and link state methods.</p> Signup and view all the answers

How is administrative distance used to select a best path?

<p>Protocols with a lower administrative distance are chosen over those with a higher administrative distance.</p> Signup and view all the answers

What is the difference between RIP and RIPv2?

<p>RIPv2 supports variable length subnet masks (VLSM), while RIP does not.</p> Signup and view all the answers

Which routing protocol is typically used within an ISP?

<p>Intermediate System to Intermediate System (IS-LS) (A), Border Gateway Protocol (BGP) (D)</p> Signup and view all the answers

Which routing protocols divide an autonomous system into areas?

<p>Intermediate System to Intermediate System (IS-IS) (A), Open Shortest Path First (OSPF) (D)</p> Signup and view all the answers

How does IS-IS differ from OSPF?

<p>OSPF requires area 0 as the backbone for network division, while IS-IS does not have this requirement.</p> Signup and view all the answers

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Study Notes

  • Distance vector routing protocols share entire routing tables with neighboring routers during each update interval.
  • Link state routing protocols share only information about their own routes and updates are limited to changes, not all networks.

Routing Path Sharing Methods

  • Distance vector protocols utilize hop count to share routing paths.
  • Link state protocols use relative link cost as the metric for sharing routing paths.

Hybrid Routing Protocols

  • Hybrid routing protocols merge characteristics of both distance vector and link state methods.

Administrative Distance

  • Each routing protocol is assigned an administrative distance to determine the best path.
  • Paths from protocols with lower administrative distances are prioritized over those with higher distances.

RIP vs. RIPv2

  • The primary difference between RIP and RIPv2 is RIPv2's support for variable length subnet masks (VLSM).
  • VLSM enhances network efficiency by allowing multiple subnet masks within the same address space, facilitating "subnetting a subnet."

Common Routing Protocols

  • Intermediate System to Intermediate System (IS-IS) is commonly used within an ISP.
  • Border Gateway Protocol (BGP) is the protocol utilized on the internet.

Autonomous Systems and Areas

  • Open Shortest Path First (OSPF) and Intermediate System to Intermediate System (IS-IS) are routing protocols that segment an autonomous system into areas.

Comparison of IS-IS and OSPF

  • OSPF requires division of large networks into areas, with a mandatory area 0 serving as the network backbone; all areas connect to area 0.
  • IS-IS also employs areas but does not require an area 0 for operation.

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