TestOut Network Pro: 7.2 Routing Protocols

Which routing protocol is typically used within an ISP? Which protocol is used on the internet?

-Intermediate System to Intermediate System (IS-LS) -Border Gateway Protocol (BGP)

What is a hybrid routing protocol?

A hybrid routing protocol combines the distance vector and link state methods.

How does IS-IS differ from OSPF?

OSPF divides a large network into areas. Each autonomous system requires an area 0 that identifies the network backbone. All areas are connected to are 0, either directly or indirectly through another area. Routes between areas must pass through are 0. IS-IS uses areas, but does not have an area 0 requirement.

Which routing protocols divide an autonomous system into areas?

Open Shortest Path First (OSPF) and Intermediate System to Intermediate System (IS-IS).

How are routing paths shared by distance vector routing protocols?

The distance vector routing protocol shares routing paths via hop count.

How are routing paths shared by link state routing protocols?

The link state routing protocol shares routing paths via relative link cost for the metric.

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

The main difference between the distance vector and the link state methods are that with the distance vector method, every router shares its entire routing table with its neighbors at every update interval. With the link state method, routers only share information about their own routes, and these updates are passed along between routers, in addition, routers only share information about changes, not all known networks at every update.

What is the difference between RIP and RIPv2? Why is this important in today's networks?

The only difference between RIP and RIPv2 is that supports variable length subnet masks (VLSM). This is important in today's networks, as VLSM allows an organization to use more than one subnet mask within the same network address space. Implementing VLSM is often referred to as "subnetting a subnet", and can be used to maximize addressing efficiency.

How is administrative distance used to select a best path?

When more than one protocol is enabled on a router, each protocol is given an administrative distance. When the path is being determined, protocols with a lower administrative distance are chosen over those with a higher administrative distance.