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34 Cards in this Set
- Front
- Back
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Link-state routing protocol uses which algorithm ?
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Dijkstra's algorithm or
SPF algorithm |
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What are the main concerns related to link-state protocols ?
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Processor overhead
Memory requirements Bandwidth consumption |
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Examples of IP routing protocols ?
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RIP - a distance vector interior routing protocol
IGRP - the Cisco distance vector interior routing protocol OSPF - a link-state interior routing protocol EIGRP - the advanced Cisco distance vector interior routing protocol BGP - a distance vector exterior routing protocol |
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RIP key characteristics ?
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It is a distance vector routing protocol.
Hop count is used as the metric for path selection. If the hop count is greater than 15, the packet is discarded. Routing updates are broadcast every 30 seconds, by default. |
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IGRP key characteristics ?
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It is a distance vector routing protocol.
Bandwidth, load, delay and reliability are used to create a composite metric. Routing updates are broadcast every 90 seconds, by default. |
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OSPF key charasteristics ?
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It is a link-state routing protocol.
It is an open standard routing protocol described in RFC 2328. The SPF algorithm is used to calculate the lowest cost to a destination. Routing updates are flooded as topology changes occur. |
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Key characteristics of EIGRP ?
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It is an enhanced distance vector routing protocol.
It uses unequal cost load balancing. It uses a combination of distance vector and link-state features. It uses Diffusing Update Algorithm (DUAL) to calculate the shortest path. Routing updates are multicast using 224.0.0.10 triggered by topology changes. |
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Key characteristics of BGP ?
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It is a distance vector exterior routing protocol.
It is used between ISPs or ISPs and clients. It is used to route Internet traffic between autonomous systems. |
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Distance vector uses which algorithm ?
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Bellman-Ford algorithm.
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Link-state routing protocol uses which algorithm ?
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Dijkstra's algorithm
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What are the main concerns related to link-state protocols ?
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Processor overhead
Memory requirements Bandwidth consumption |
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Examples of IP routing protocols ?
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RIP - a distance vector interior routing protocol
IGRP - the Cisco distance vector interior routing protocol OSPF - a link-state interior routing protocol EIGRP - the advanced Cisco distance vector interior routing protocol BGP - a distance vector exterior routing protocol |
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RIP key characteristics ?
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It is a distance vector routing protocol.
Hop count is used as the metric for path selection. If the hop count is greater than 15, the packet is discarded. Routing updates are broadcast every 30 seconds, by default. |
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IGRP key characteristics ?
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It is a distance vector routing protocol.
Bandwidth, load, delay and reliability are used to create a composite metric. Routing updates are broadcast every 90 seconds, by default. |
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How do Routing loops occur ?
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Routing loops can occur when inconsistent routing tables are not updated due to slow convergence in a changing network
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RIP updates how often ?
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RIP updates occur every 30 seconds
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RIP v2 enhancements include ?
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Ability to carry additional packet routing information
Authentication mechanism to secure table updates Support for variable-length subnet mask (VLSM) |
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RIP optional tasks include the following ?
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Apply offsets to routing metrics
Adjust timers Specify a RIP version Enable RIP authentication Configure route summarization on an interface Verify IP route summarization Disable automatic route summarization Run IGRP and RIP concurrently Disable the validation of source IP addresses Enable or disable split horizon Connect RIP to a WAN |
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To reduce routing loops and counting to infinity, RIP uses the following techniques ?
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Split horizon
Poison reverse Holddown counters Triggered updates |
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The default holddown for RIP is ?
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180 seconds
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Defult Administrative Distance - Static route
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1
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Defult Administrative Distance - EIGRP Summary route
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5
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Defult Administrative Distance - External BGP
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20
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Defult Administrative Distance - EIGRP internal route
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90
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Defult Administrative Distance - IGRP
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100
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Defult Administrative Distance - OSPF
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110
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Defult Administrative Distance - IS-IS
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115
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Defult Administrative Distance - RIP
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120
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Defult Administrative Distance - EIGRP external route
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170
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Defult Administrative Distance - Internal BGP
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200
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Defult Administrative Distance - Unknown
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255
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Defult Administrative Distance - Connected Interface
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0
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IGRP sends routing updates ?
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90 second intervals
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IGRP routing protocol uses which metrics ?
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bandwidth and delay
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