ENARSI Cram Sheet¶
The facts most worth re-reading the night before, one section per blueprint area. ENARSI is a troubleshooting exam, so each section ends with the faults that come up most often.
1.1 Administrative distance¶
| Source | AD |
|---|---|
| Connected | 0 |
| Static | 1 |
| EIGRP summary | 5 |
| eBGP | 20 |
| EIGRP internal | 90 |
| OSPF | 110 |
| IS-IS | 115 |
| RIP | 120 |
| EIGRP external | 170 |
| iBGP | 200 |
| Unusable | 255 |
- AD only compares routes to the same prefix and length. Longest match wins first.
- A floating static route needs an AD higher than the dynamic route it backs up.
distancechanges AD per protocol, per source, or per prefix (with an ACL).
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