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42 Cards in this Set
- Front
- Back
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What rule states that 'a router cannot advertise a route BACK OUT the interface on which the route was learned'? |
SPLIT HORIZON
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What action does the router running a Distance Vector routing protocol take when one of its routed interface's Link or Line–Protocol goes down?
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ROUTE POISONING. Proactively generating a routing update with an infinite metric and flooding it to its neighboring routers.
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What action do the routers that hear the Route Poisoning Advertisement take when they receive the advertisement?
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POISON REVERSE. They send the poisoned route back to the originator of the advertisement. |
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What is the IP limitation of IPv4?
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Classful addressing only
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Does RIPv1 send the subnet mask with its advertisements?
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No
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What is the IP limitation of RIPv1?
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Classful addressing only
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Does RIPv1 send the subnet mask with its advertisements?
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No
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What did RIPv2 improve?
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1 - Routing of Classless addresses 2 - Authentication 3 - Triggered updates 4 - Multicast adv. instead of broadcast |
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What is significant about RIP Version 2’s ‘Triggered Updates’ (aka Flash Updates)?
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They immediately advertise network changes on their directly connected network segments to their neighbors without waiting for the regularly scheduled Update Timer to expire. |
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What is the name of the IPv6 version of RIP?
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RIPng (next generation)
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What is the Administrative Distance of RIP?
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120
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What is the UDP port that is used by RIPv1 & RIPv2?
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UDP 520
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What is the UDP port that is used by RIPng?
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UDP 521
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How does RIPv1 issue its advertisements?
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Destination address is the Broadcast
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How does RIPv2 issue its advertisements?
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Destination address is 224.0.0.9
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How does RIPng issue its advertisements?
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Destination address is FF02::9
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Does RIPv1 allow authentication?
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No
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Does RIPv2 allow authentication?
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Yes, plain text and MD5 hashed
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Does RIPng allow authentication?
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No |
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What algorithm is used for RIP calculation?
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Bellman-Ford
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What is the metric used for RIP calculations?
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Hop count |
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What is the max hop count in RIP?
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15 hops, 16 is considered 'infinite'
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What type of routing protocol is RIP?
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Distance Vector, (Distance=Metric, Vector=Interface) |
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What 4 commands can you run to troubleshoot RIP?
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1 - 'show run | section rip' 2 - 'show ip route rip' 3 - 'show ip protocols' 4 - 'show ip rip database' |
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What does RIP do every 30 seconds?
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Resends the entire routing table out all interfaces |
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What is the command that will start the RIP process on a router?
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‘router rip’ from Global Configuration Mode |
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What command will enable the more advanced features of the IPv4 flavor of RIP?
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‘version 2’ from Router Configuration Mode |
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What command will enable out interfaces with an IP on the 192.168.1.0 /25?
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‘network 192.168.1.0’ from Router Configuration Mode |
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I want to advertise this router as the default route to all other routers. What command do I use?
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'default-information originate' from Router Configuration Mode. |
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I want to summarize my routes to a router connected to one of my interfaces.
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'ip summary-address rip [ip address] [subnet mask]' from Interface Configuration Mode. |
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What are the steps to enabling plaintext authentication for RIP.
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1 – Create your key-chain ‘key chain [name]' from Global Configuration Mode. ‘key [number]' from Key-chain Configuration Mode. 'key-string [password]' from Key-chain Configuration Mode. 2 – Encrypt your key in your Configuration ‘service password-encryption' from Global Configuration Mode. 3 – Enable Authentication for RIP on the Interface ‘ip rip authentication key-chain [name]' from Interface Configuration Mode. |
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What command do you use if you want to turn you plaintext authentication into MD5 hashed authentication?
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‘ip rip authentication mode md5’ from Interface Configuration Mode. |
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I want to stop all advertisements out of my interfaces by default and only enable them out of select interfaces. |
'passive-interface default’ from Router Configuration Mode.
'no passive-interface [interface]’ from Router Configuration Mode. |
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How do you configure a unicast neighbor in RIPv2?
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'neighbor [ip address]' from Router Configuration Mode. |
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How do you disable automatic summarization in RIP?
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'no auto-summary' from Router Configuration Mode. |
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If I want to modify RIP’s timers what command will I use?
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‘timers basic [update] [invalid] [hold-down] [flush]' from Router Configuration Mode. |
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What command do you use if you want to toggle how many equal-cost paths RIP will load-balance across?
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‘maximum-paths [1-16]' from Router Configuration Mode. |
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What command do I need to use 1st if I want to enable routing for IPv6?
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‘ipv6 unicast-routing' from Global Configuration Mode. |
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What command do I need to use to enable RIPng?
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‘ipv6 router rip [name of process]’ from Global Configuration Mode. |
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What command do I need to use to enable RIPng routing on a particular interface?
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‘ipv6 rip [name of process] enable’ from Interface Configuration Mode. |
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What command do you issue to summarize an IPv6 prefix out a particular interface?
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‘ipv6 rip [name of process] summary-address [prefix]’ from Interface Configuration Mode. |
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After doing a ‘show ip protocols’ and double checking my timers, I do a debug and notice that the invalid timer is off by a few seconds. My boss is standing over my shoulder and wants to know why it’s off, so you’d better have an explanation for this CHAOS and MAYHEM! |
RIP_Jitter was included in the standard to accommodate routing over Half Duplex networks. It is a 0-15% random timer delay that ensures that two routers will not consistently transmit their updates at the same time. |
