What is the metric that is used by OSPF?

What is the metric that is used by OSPF?

Open Shortest Path First (OSPF) uses “Cost” as the value of metric and uses a Reference Bandwidth of 100 Mbps for cost calculation. The formula to calculate the cost is Reference Bandwidth divided by interface bandwidth. For example, in the case of 10 Mbps Ethernet , OSPF Metric Cost value is 100 Mbps / 10 Mbps = 10.

What is admin distance and metric?

In other words, the administrative distance is used to compare routes originating from different routing protocols (including static and connected), whereas the metric is used to compare routes within one single source of origin or family. …

Does OSPF use distance vector?

OSPF is not a distance-vector protocol like RIP, but a link-state protocol with a set of metrics that can be used to reflect much more about a network than just the number of routers encountered between source and destination. In OSPF, a router attempts to route based on the “state of the links.”

What is the default administrative distance for OSPF?

110
To set an administrative distance: For RIP and OSPF, issue the distance command in Router Configuration mode. The range for administrative distance is 0–255. The default value is 120 for RIP routes and 110 for OSPF routes.

What is a metric value?

A metric is a value that’s assigned to an IP route for a particular network interface. It identifies the cost that’s associated with using that route. For example, the metric can be valued in terms of link speed, hop count, or time delay.

What is metric rip?

Routing Information Protocol (RIP) Overview. RIP uses a hop count metric to measure the distance to a destination. In the RIP metric, a router advertises directly connected networks at a metric of 1 by default. Networks that are reachable through one other gateway are 2 hops, etc.

What is metric Cisco?

Metrics – A number denoting the best route (to reach a subnet) in a single routing protocol on a single router. (Useful when a routing protocl has many routes to a single network and cant decide which to use) (The lower it is, the more believable it is)

Is OSPF a link state protocol?

Open Shortest Path First (OSPF) is a link-state routing protocol that was developed for IP networks and is based on the Shortest Path First (SPF) algorithm. OSPF is an Interior Gateway Protocol (IGP).

What are the two main elements of distance vector routing?

Routing Table

• NET ID: The Network ID defines the final destination of the packet.
• Cost: The cost is the number of hops that packet must take to get there.
• Next hop: It is the router to which the packet must be delivered.

What is the administrative distance of OSPF Mcq?

Solution(By Examveda Team) OSPF has an AD of 110. RIPv1 and RIPv2 both have an AD of 120, and EIGRP is the lowest, at 90.

What is the relationship between bandwidth and cost in OSPF?

Respectively it will take less time in crossing a higher bandwidth link than a lower bandwidth link. OSPF uses this logic to calculate the cost. Cost is the inverse proportional of bandwidth. Higher bandwidth has a lower cost. Lower bandwidth has a higher cost.

What is the difference between Rip and OSPF?

Each routing protocol uses its own metric. For example, RIP uses hop counts as a metric, while OSPF uses cost. The following example explains the way RIP calculates its metric and why it chooses one path over another. RIP has been configured on all routers.

How is the cumulative cost calculated in OSPF?

While calculating cumulative cost, OSPF consider only outgoing interfaces in path. It does not add the cost of incoming interfaces in cumulative cost. If multiple routes exist, SPF compares the cumulative costs. Route which has the lowest cumulative cost will be chosen for routing table.

What is best route for routing table in OSPF?

Best route for routing table = Route which has the lowest cumulative cost OSPF uses SPT tree to calculate the best route for routing table. A SPT tree cannot grow beyond the area. So if a router has interfaces in multiple areas, it needs to build separate tree for each area.