For the CCNA Exam the Routing Information Protocol (RIP) is still covered.  Your knowledge of this protocol is not going to need to be extremely extensive but you will need to know some of the highlights. 

• RIP is a Distance Vector routing protocol
• RIPs Administrative Distance is 120
• RIP uses hop count to choose the best path.  This is called a metric.  The shortest hop count is preferred. 
• RIP has two versions, Version 1 and Version 2
  • Version 1 is Classfull, meaning it does not advertise a Subnet Mask with the routing update
  • Version 1 Sends the RIP updates to the broadcast address 255.255.255.255
  • Version 1 assumes that all the subnet masks in the network are the same.  This is called Fixed Length Subnet Masking (FLSM)
  • Version 2 is Classless meaning it does send a subnet mask with the update.
  • Version 2 sends the RIP updates to the multicast address 224.0.0.9
  • Version 2 supports Variable Length Subnet Masking

To configure RIP follow these steps:



! Enable the RIP process on the router:

config t
router rip

! Once enabled you need to change it to Version 2 as this is not the default.

version 2

! Also, RIP summarizes routes at the classfull network boundary.  


! It's common to see the following:

no auto-summary

! Next tell RIP what networks it will advertise into the RIP process.  

! You need a statement here for every network you are connected to and 


! that you want other routers in the network to see and be able to get to.

network 10.0.0.0
network 192.168.1.0

! Exit the configuration mode:

end

! Verify RIP with the following commands:

Show IP Protocols
Show IP Route
Show IP Route RIP