are you sure about your second statement?
In many questions, when there are two routing protocols and a path, we look at the prefix length, not the AD.
For example on the page preceding question 227 in the answers an OSPF route is preferred over a static route.
Prefix is dominant when the routes are already installed on the routing table (already learned). When a router is choosing which to install on the routing table, it looks at AD. When choosing multiple paths from one protocol, metric.
forgot to mention the last statement I made is still when the router is trying to choose what path to install. Only look at prefix when the routes are already installed in the table.
A tricky question. Let me try to explain:
According to the question, the destination is same i.e. same route, but it's learned using two different paths. Normally, router uses administrative distance as a parameter to select the best path when multiple routing protocols are used, but since both paths are running with EIGRP, so both have the same AD (=90) so it's a tie. Next the router will consider the metric value for path selection. So, C should be the correct option here.
I am super confused about this answer.
EIGRP metric is calculated based on the different factors ( bandwidth, delay, reliability and load)
OSPF metric is calculated based on the different links' capacity and load. Therefore, it chooses the link that is more reliable.
When a router running EIGRP learns the same route from multiple paths, it selects the best path based on the metric, not the administrative distance or as-path. Therefore, the correct answer is C. metric.
The EIGRP metric is calculated based on several parameters such as bandwidth, delay, reliability, and load. The router calculates the metric for each path it learns and selects the one with the lowest metric as the best path. The metric can be influenced by adjusting the weights of the individual parameters using the K values.
Guys please dont get confused here in question we are asked Router is only running EIGRP and have multiple path to same destination, If we have multiple protocols we use Longest Prefix to get the most specific route, if multiple routs are there with multiple protocols then we use AD values to decide best route.
When it comes to only 1 protocol is running, we can't use AD, we use Metric. For every protocol we have different Metric.
1)Metric for EIGRP is Metric itself, which has been derived by using delay and bandwidth.
2)Metric for OSPF is Cost, which has been derived by using refrence bandwidth and speed of interface.
3)Metric for RIP is Hop counts.
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