Interior or Exterior Gateway Protocol?

About this interactive

The lesson's first choice when picking a routing protocol: - **Interior gateway protocols** pass routes router to router inside an organization's networks: a company's campus, its sites and its own WAN links. They are distance vector (RIP) or link state (OSPF, IS-IS), with EIGRP between the two. - **Exterior gateway protocols** run between internet service providers, where their networks interconnect. They use path vector; BGP is the one in use. The next choice, distance vector or link state, is practised in the comparison sorter before this one.

What you'll learn

Tell an interior gateway protocol at work (routing inside one organization, such as RIP, OSPF or EIGRP) from an exterior gateway protocol (routing between internet service providers, BGP)
Recognize that interior protocols are distance vector or link state, and exterior protocols use path vector

Aligned to

Cisco CCNA

3.4 Configure and verify single area OSPFv2

3.2 Determine how a router makes a forwarding decision by default

Key terms

Interior Gateway Protocol: A category of routing protocols used to exchange routing information within a single autonomous system, including protocols such as OSPF, EIGRP, and RIP. IGPs are contrasted with EGPs such as BGP, which route between autonomous systems.
Border Gateway Protocol: The routing protocol used to exchange routing information between autonomous systems on the internet.
Routing Information Protocol: One of the oldest distance-vector routing protocols, using hop count as its sole routing metric with a maximum of 15 hops to prevent routing loops. RIP sends full routing table updates periodically and converges slowly compared to modern protocols, making it suitable only for small networks.
Open Shortest Path First: A link-state interior gateway routing protocol that maintains a complete map of the network topology and uses Dijkstra's Shortest Path First algorithm to calculate optimal, loop-free routes. OSPF divides networks into hierarchical areas to improve scalability and supports VLSM and rapid convergence.

Topics

Routing Routing Protocols Igp Egp Bgp Interactive Streak Sort

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