A network engineer is configuring a core router that learns a path to the network through multiple routing sources simultaneously: an internal OSPF advertisement, a RIPv2 advertisement, and a manually configured static route. All sources advertise the exact same prefix length. Which path will the router install into its active routing table, and why?
- The static route, because static routes have a lower Administrative Distance than OSPF and RIPv2.Cevap
- BThe OSPF route, because dynamic routing protocol updates operate at Layer 2 to bypass IP routing table overhead.
- CThe RIPv2 route, because distance-vector protocols automatically override link-state protocols when hop counts are equal.
- DAll three routes simultaneously in a round-robin load-balancing group across different VLAN broadcast domains.
Cevap
The static route is installed into the routing table because it has the lowest Administrative Distance (AD = 1) compared to OSPF (AD = 110) and RIPv2 (AD = 120) for the exact same destination prefix.
When a router receives multiple routes to the exact same destination network prefix from different routing sources, it uses Administrative Distance (AD) to select the best route. Default AD values are: Static route = 1, OSPF = 110, and RIPv2 = 120. Because lower AD indicates higher trustworthiness, the static route is selected.
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Anahtar Kavram
Administrative Distance Hierarchy and Route Selection