Podcast
Questions and Answers
Which of the following has the least default administrative distance?
Which of the following has the least default administrative distance?
- OSPF
- Static route to an IP address (correct)
- External BGP
- RIP
Which of the following is a key characteristic of administrative distance?
Which of the following is a key characteristic of administrative distance?
- Metric value is the only factor in route selection
- Highest wins
- Default values are fixed and cannot be changed
- Configurable (correct)
What is the default administrative distance value for OSPF?
What is the default administrative distance value for OSPF?
- 110 (correct)
- 100
- 90
- 120
What happens when multiple routes have the same administrative distance?
What happens when multiple routes have the same administrative distance?
Which of the following use cases involves configuring administrative distance to prioritize specific routes?
Which of the following use cases involves configuring administrative distance to prioritize specific routes?
What is the default administrative distance value for external EIGRP routes?
What is the default administrative distance value for external EIGRP routes?
Flashcards
Static route to an IP address
Static route to an IP address
The route type with the lowest default administrative distance, making it most preferred.
Configurable
Configurable
A characteristic of administrative distance that allows network administrators to change the preference of routes.
OSPF default AD
OSPF default AD
The default administrative distance for routes learned via the Open Shortest Path First (OSPF) routing protocol.
Same AD
Same AD
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Prioritizing Routes
Prioritizing Routes
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External EIGRP AD
External EIGRP AD
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Study Notes
Administrative Distance
Administrative distance is a value assigned to a route in a routing table to determine its trustworthiness or preference. It is used by routing protocols to select the best route to a destination network.
Key characteristics:
- Lowest wins: The route with the lowest administrative distance is preferred.
- Default values: Each routing protocol has a default administrative distance value.
- Configurable: Administrative distance can be manually configured to influence route selection.
Default administrative distance values:
- Connected routes: 0
- Static routes: 1
- EIGRP: 90 (internal), 170 (external)
- OSPF: 110
- RIP: 120
- BGP: 20 (internal), 200 (external)
Influence on route selection:
- A route with a lower administrative distance is preferred over one with a higher value.
- If multiple routes have the same administrative distance, other metrics (e.g., metric value, hop count) are used to select the best route.
Use cases:
- Route filtering: Use administrative distance to filter out unwanted routes or prefer specific routes.
- Route redundancy: Configure administrative distance to ensure redundant routes are used in case of primary route failure.
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