Ch.16 Configuring IPv4 Addresses and Static Routes Flashcards
What is the first step of a router routing logic
For each received data-link frame, choose whether or not to process the frame
What is the second step of a router routing logic
De-encapsulate the packet from inside the data-link frame
What is the third step of a router routing logic
Make a routing decision
What is the fourth step of a router routing logic
Encapsulate the packet into a data-link frame appropriate for the outgoing interface
What is the fifth step of a router routing logic
Transmit the frame out the outgoing interface
What are the three ways a router adds routes to its configuration
Connected routes
Static routes
Routing protocols
What is another name for a static route
network route
Define default route
Matches all destination IP addresses
Define a host route
When a single ip address is matched to an mac address
What command allows you to configure a static rout
ip route
What is a floating static route
A static IP route that uses a higher administrative distance than other routes. Mostly used if the preferred method of routing protocol fails
How to set the administrative distance in the command IP route
ip route (ipaddress) (subnet mask) (ipaddress of router / destination) (ad value )
What do you do when troubleshooting Incorrect Static Routes That Appear in the IP Routing Table
- Check if there is a subnetting math error in the subnet ID and mask
- Is the next-hop IP address correct and referencing an IP address on a neighboring router
- Does the next-hop IP address identify the correct router
- Is the outgoing interface correct, and referencing an interface on the local router
What do you do when troubleshooting The static route does not appear in the IP routing table
- For ip route commands that list an outgoing interface, that interface must be in an up/up state
- For ip route commands that list a next-hop IP address, the local router must have a route to reach that next-hop address
The correct static route appears but works poorly
- Check that the route is properly configured and keep an out out for a configuration with a permanent route applied
- Check for other possible issues outside of the routing configuration
What odes a router when a destination IP address matches more than one route in a routers IPv4 routing table
The router uses the most specific route- in other words, the route with the longest prefix length mask
show ip route
Lists the routers entire routing table
show arp, show ip arp
Lists the router IPv4 ARP table
clear ip arp [ip-address]
Removes all dynamically learned ARP table entries, or if the command lists an IP address, removes the entry for that IP address only
