Understand the role of a layer 3 Router Flashcards
What is most commonly used when a computer needs to forward a packet to the IP address of a device on a remote network?
Default Gateway
What is the name of a device that can do layer two switching and layer three routing?
Multi-Layer Switch
How does a router determine where to forward a packet? There are three methods.
A router determines where to forward a packet using directly connected networks, static routes, and routes learned through dynamic routing protocols.
How does a router forward a packet using a static route?
When a router receives a packet with a destination IP address that matches a static route, it forwards the packet according to the instructions provided in the static route configuration, which typically includes the next hop IP address and the outgoing interface.
What is a dynamic routing protocol?
A dynamic routing protocol is a network protocol that automatically discovers and maintains routes within a network by sharing routing information between routers.
How does a router use a dynamic routing protocol to forward packets?
A router uses dynamic routing protocols to update its routing table with the best paths to network destinations. When a packet arrives, the router consults its routing table and forwards the packet based on the information provided by the dynamic routing protocol.
Common dynamic routing protocols include:
OSPF (Open Shortest Path First)
EIGRP (Enhanced Interior Gateway Routing Protocol)
BGP (Border Gateway Protocol)
RIP (Routing Information Protocol)
Which routing protocol should be used on a new router, R1, to learn routes dynamically from another Router or Firewall?
The same routing protocol that the other router or firewall is running
When a router learns new routes from directly connected networks, static routes, or a dynamic routing protocol, where does the router place those routes?
In the IP routing table
How can you determine how a router learned about a specific route in its routing table?
By looking at the code next to the route in the output of the show IP route command
