Routing Tables (obj 2.1) Flashcards
(10 cards)
What is the purpose of a Routing Table?
Helps determine which route entry is the best fit for the network
It is used to decide where packets need to go inside and outside of networks.
On what layer of the OSI model are routing decisions based?
Layer 3
Routing decisions map to Layer 2.
What is the function of the ARP Cache?
Used by routers to map IP addresses to MAC addresses within a local area network
It helps routers determine the best route for routing traffic.
What does a longer prefix in a routing table indicate?
More specific networks
A longer prefix means fewer available IP addresses in that range.
What is a Directly Connected Route?
Learned by a physical connection between routers
What are Static routes?
Configured manually by an administrator
Example: 0.0.0.0/0 is the default static route to handle unknown destinations.
What defines a Dynamic route?
Learned through dynamic routing protocols
Learned by exchanging information automatically between routers based on the protocols.
What factors do Dynamic Routing Protocols negotiate?
Number of hops and link bandwidth
What is the purpose of Split Horizon?
Prevents a route learned on one interface from being advertised back out the same interface
What does Poison Reverse do?
Advertises a route back out the same interface but with a high cost to prevent its use
