why did rip decide to lay down
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Explanation:
Because noone can stand after death'
Answer:
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Routing Information Protocol
Related terms:
Routing Protocol
autonomous system
Distance Vector
internet protocol
Open Shortest Path First
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Implementing RIP, Version 2
Dale Liu, ... Luigi DiGrande, in Cisco CCNA/CCENT Exam 640-802, 640-822, 640-816 Preparation Kit, 2009
Introduction
Routing Information Protocol (RIP), version 2, is a non-proprietary distance vector protocol that is easy to implement in a network infrastructure. All CCNA students need to know how to successfully implement RIP 2 on a Cisco router. During the CCNA exam, test takers may be presented with simulations that require them to successfully configure RIP 2 routing.
For CCNA students to successfully implement RIP 2 on a Cisco network, they should know the commands for implementing, configuring, and troubleshooting RIP 2. Individuals with their CCNA certificates should also know how to secure routers using RIP 2 with Message Digest (MD5) authentication. Use the simulation materials provided with this book to acquire sufficient practice implementing RIP 2 prior to taking the CCNA exam. Knowing how to implement RIP 2 is a required skill for passing the CCNA exam, as well as an important skill for individuals working with Cisco equipment in the industry.
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Using Filters
Robert J. Shimonski, ... Yuri Gordienko, in Sniffer Pro Network Optimization and Troubleshooting Handbook, 2002
Routing Information Protocol
Your customer has just installed two new routers with multiple interfaces. He did not want to spend time on manual configuration of IP static routes and decided to implement a dynamic routing protocol. Because he does not have much experience with dynamic routing protocols, he wants to use RIP version 1—the simplest of available protocols. He used some examples from the documentation CDs he got with the routers, but he ran into problems: Routes are appearing and disappearing from the routing tables and his network is very unstable. He has asked you to look into the issue and resolve its.
NOTE
RIP is one of the most popular and definitely the simplest of the large variety of IP routing protocols. RIP version 1 is a classful routing protocol (refer to the “IP Address Filtering” section of this chapter for the definition of classful routing) that employs UDP packets to send broadcast periodic updates. Hop count is used as a metric to choose the best path between destinations. A network that is 16 hops away is considered unreachable, and that is a limiting factor of the diameter of a RIP-enabled network.
RIP version 2 is very similar to RIP version 1 in the sense that it uses periodic updates and hop count as a metric, but it has a few major differences:
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RIP version 2 messages carry network masks (therefore, RIP version 2 is a classless protocol).
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RIP version 2 uses multicast address 224.0.0.9 as a destination for routing updates.
For more information on RIP and RIP packet format, refer towww.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/rip.htm.
As a Sniffer Pro expert, you started your research by taking a snapshot of traffic on the customer's network. You found nothing unusual; the network was not overutilized, you discovered no packet loss of loops. The next step is to define a filter that will capture only the traffic related to the problem you are investigating.
In other words, you need to define a filter that will permit RIP traffic only. As usual, you define a new capture profile. After you have created the profile, move to the Advanced tab in the Define Protocol window. In the list of available protocols, select IP, UDP, RIP. Start capturing traffic and wait for at least 10 minutes for enough RIP messages to arrive.
Figure 8.20 shows the capture that was made on the customers' site. Do you see something abnormal? Isn't it strange that you see only one RIP update from the router with an IP address 102.168.2.9 for each 10 updates from the router with the IP 192.168.2.10? This is very strange, so you recommend that the customer check RIP timers on the router with the IP address 192.168.2.9. Bingo! The customer finds the configuration problem and gets it resolved.

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Figure 8.20. Misconfigured RIP Timers
NOTE
RFC 1723 defines only 25 routing entries per RIP update. Therefore, if your routing table contains more than 25 routes, RIP has to send more than one RIP packet to advertise all these routes. For example, if you have 60 routes advertised by RIP on your network, you will see three packets to be generated every so often (every 30 seconds, by default). Two of them will contain 25 routing entries, and the third one will contain 10 routing entries.
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