A Layer 3 router receives an IP packet and has multiple matching entries in its routing table for the destination address. Arrange the steps of the router's path selection process in the correct order from first to last.
- 1Filter candidate routes to identify the entries with the longest prefix match for the destination IP address.
- 2Compare the administrative distance among candidate routes with identical prefix lengths to select the most trustworthy route source.
- 3Compare protocol-specific metric values among candidate routes that share equal administrative distance.
- 4Install the optimal path into the active routing table for packet forwarding.
Cevap
The correct order of steps for the router path selection process is: 1) Filter candidate routes by evaluating the longest prefix match for the destination IP address, 2) Compare the administrative distance among routes with identical prefix lengths, 3) Compare protocol-specific metric values among routes with equal administrative distance, and 4) Install the optimal path into the active routing table for packet forwarding.
When an IP packet arrives, the router first identifies routes with the longest prefix match. If multiple routes share the exact same prefix length, the router compares their administrative distance to determine which protocol source is most believable. If routes share both equal prefix lengths and equal administrative distance (coming from the same protocol), the router compares protocol metrics to find the path with the lowest cost. Finally, the selected route is installed into the active forwarding table.
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Anahtar Kavram
Router Path Selection Hierarchy (Longest Prefix Match -> Administrative Distance -> Protocol Metric)