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23 Cards in this Set
- Front
- Back
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What type of routing protocol is RIP?
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Distance Vector
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How do distance vector protocols propagate routes?
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Entire routing tables passed between routers regardless of network changes.
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What type of routing protocol is OSPF?
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Link State
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How do link state protocols propagate routes?
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Devices create 'map' of entire area based on info received.
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What type of routing protocol is EIGRP?
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Hybrid
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How do invalidation timers prevent routing problems?
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Marks a route unreachable if no update received for certain amount of time.
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What are some tools used by protocols to solve routing problems?
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Invalidation timers
Hop count limit Triggered updates Hold-down timers Asynchronous updates Route poisoning Split Horizon Poison Reverse |
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How does a hop count limit prevent routing problems?
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Prevents update loops
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How do triggered updates solve routing problems?
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Only send updates if changes occur
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How do asynchronous updates solve routing problems?
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Institutes a random delay so not all routers are updating at the same time.
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What is route poisoning?
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Metric is set to unreachable
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What is split horizon?
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Do not send updates out an interface where the update was received - prevents loops
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What is poison reverse?
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Exception to split horizon - poisoned routes can be sent out same interface
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Where does split horizon not work well?
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Frame Relay hub/spoke topologies - EIGRP needs split horizon disabled
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What are some benefits of summarization?
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Conserves router resources
Simplifies redistribution Improves manageability Reduces size of convergence domains |
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Which routing protocols automatically summarize by default?
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RIP, EIGRP
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Should automatic summarization be configured?
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No, it should be disabled with 'no auto-summary'
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How do classful protocols differ from classless protocols?
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Classful protocols do not send subnet mask info with routing updates.
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How are classless protocols better?
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They allow for Variable Length Subnet Masks
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How does routing change by configuring 'ip classless'
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Traffic is permitted to follow a default route if destined for unknown subnet of directly connected prefix.
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What is administrative distance?
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Routing trustworthiness measure - serves as tiebreaker if same prefix is learned via multiple protocols.
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What is a routing metric?
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Routing measure within a specific protocol
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How does prefix length determine routing decisions?
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Longest subnet mask wins (most specific route)
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