Static and Dynamic Routing - CompTIA Network+ N10-007 Prof Messer
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If you can set a default route, why would you use static over dynamic?
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@mary said in Static and Dynamic Routing - CompTIA Network+ N10-007 Prof Messer:
If you can set a default route, why would you use static over dynamic?
Static routes require a human to modify them anytime anything changes. So, for example, the route you want fails because a device dies. If you have static routing, then you simply go offline until you go and change the route to something else manually. When the device is repaired, you won't go back to the optimum route until such time as someone manually puts it back.
With dynamic routing, the protocols look for the best routes at all time and can not just adjust for failure conditions, but can also detect new routes that are better when they appear, go back to repaired routes, detect congestion and adjust routes based on temporary traffic conditions, etc.
Think of one as having a map telling you how to get from point A to point B and if there is road construction or loads of traffic or an accident, that you just have to sit there until your route clears up. And dynamic routing like a GPS that adjusts based on real world conditions and gives you an alternative route should your main one be blocked or slow.
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Both required a good initial configuration, but when "issues" occurs like link flaps or ISP outage (when MPLS fails), Dynamic may affect Router performance (CPU, Memory, etc).
Using Dynamic Routing; if you have no backup link or you dont have a proper failover configuration with correct threshold, the network updates will cause router performance degradation. It constantly will try to reach destination via default gateway.
Using Static Routing; If you have not a recovery plan or a back door to enter the remote router, you will have zero access to that device until link or issue is restored. Packets will be forwarded to a dead route.
For both, Initial design and configuration is the Key, when issues happens troubleshooting is a nightmare when things are not well done.
