Administrative Distance (AD) is a numeric value which can range from 0 to 255. A smaller Administrative Distance (AD) is more trusted by a router, therefore the best Administrative Distance (AD) being 0 and the worst, 255.
What is administrative distance value?
Administrative Distance (AD) is a value that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols. … Administrative Distance (AD) is a numeric value which can range from 0 to 255.
What is the administrative distance value of OSPF?
Default Distance Value Table
| Route Source | Default Distance Values |
|---|---|
| External Border Gateway Protocol (BGP) | 20 |
| Internal EIGRP | 90 |
| IGRP | 100 |
| OSPF | 110 |
What is the administrative distance for RIP?
By default, OSPF has a default administrative distance of 110 and RIP has a default administrative distance of 120.
What does an administrative distance of 0 mean?
An administrative distance is a number between 0 and 255, with the lower number being better. The AD of 0 indicates the most trusted route (the directly connected network). The AD of 255 means that the route will not be trusted.
How do I set administrative distance?
To set an administrative distance:
- For RIP and OSPF, issue the distance command in Router Configuration mode. host1(config-router)#distance 100. The range for administrative distance is 0–255. …
- For IS-IS, issue the distance ip command in Router Configuration mode. host1(config-router)#distance 80 ip.
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For what purpose is an administrative distance ad used?
Administrative Distance (AD) is used to rate the trustworthiness of routing information received from the neighbour router. The route with the least AD will be selected as the best route to reach the destination remote network and that route will be placed in the routing table.
What route would have the lowest administrative distance?
The most believable route or the route with the lowest administrative distance is one that is directly connected to a router.
What does administrative distance rank?
What does administrative distance rank? Explanation: Sources of routing information is the administrative distance rank. It is used by routers to select the best path when there are different routes to the same destination.
What does RIP use for his administrative distance metric?
Metric is the measure used to decide which route is better (lower number is better). Each routing protocol uses its own metric. For example, RIP uses hop counts as a metric, while OSPF uses cost. The following example explains the way RIP calculates its metric and why it chooses one path over another.
What is the main disadvantage of using RIP?
Limitations of RIP-1 include the following: RIP cannot support an internal network with more than 15 hops within the same network. A router counts the hops a packet makes as it crosses other routers on the way to its destination. RIP cannot support variable-length subnet masking.
Which version of RIP is used for IPv6?
IPv6 RIP functions the same and offers the same benefits as RIP in IPv4. RIP enhancements for IPv6, detailed in RFC 2080, include support for IPv6 addresses and prefixes, and the use of the all-RIP-devices multicast group address FF02::9 as the destination address for RIP update messages.
What is the difference between metric and administrative distance?
As opposed to administrative distance, metrics involve a single routing protocol. They have nothing to do with multiple sources for routes. Different routing protocols calculate their metric in different ways. RIP uses hops, OSPF uses bandwidth, and EIGRP uses a combination of bandwidth, delay, load, and reliability.
Is OSPF better than Eigrp?
OSPF scales better than EIGRP because EIGRP is more complex in very large scale networks while troubleshooting. Compared to EIGRP, OSPF is better to use on WAN since most of the service providers support it. OSPF have already been running in internal environments as an IGP (Interior Gateway Protocol).
What is a floating route?
A Floating static route is a route that has a higher administrative distance then the current route in a routing table. Think of how a router works for a second; The routes that have a lower administrative distance number will be the ones installed into the routing table whereas higher AD numbers will not.
What is BGP protocol?
“Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information between autonomous systems (AS) on the Internet. The protocol is often classified as a path vector protocol but is sometimes also classed as a distance-vector routing protocol.”