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38 Cards in this Set
- Front
- Back
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What two pieces of information does EIGRP use to make route calculations? |
Link bandwidth and delay |
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Does EIGRP converge quickly or slowly? |
Quickly |
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What is the default Hello interval for EIGRP? |
5 sec |
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What is the default Hold interval for EIGRP? |
15 sec |
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What 2 timers does EIGRP use for maintaining neighbor relationships? |
Hello and Hold timers |
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Does EIGRP require neighbors to have identical Hello and Hold timers? |
No |
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What route advertising tool does EIGRP use to prevent loops? |
Split horizon |
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What address are EIGRP Hello messages sent to? |
224.0.0.10 |
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Do EIGRP neighbors need to use the same Autonomous System number? |
Yes |
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What address does EIGRP send update messages to? |
The unicast address if only 1 neighbor; otherwise, 224.0.0.10 |
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What type of messages does EIGRP use to send topology information to neighbors? |
Update messages |
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What protocol does EIGRP use for transport-layer updates? |
Reliable Transport Protocol (RTP) |
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When does EIGRP send full updates? |
When a neighbor first comes up |
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What is the formula for EIGRP's metric? |
((10^7/least bandwidth) + cumulative delay) * 256 |
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For EIGRP, what is least bandwidth, and what is the unit of measurement? |
The bandwidth of the slowest link in a path, in kbps |
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In EIGRP terms, what is cumulative delay, and what unit is it measured in? |
The sum of all delay values on outgoing interfaces, measured in 10's of ms |
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What command will set the bandwidth of a link? |
Bandwidth |
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What command will set the delay of an interface? |
Delay |
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What is Feasible Distance? |
A local router's calculated best route to a subnet |
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What is Reported Distance? |
The next-hop router's best route to a subnet |
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What is a successor route? |
The route with the lowest Feasible Distance |
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Are Successor Routes added to the routing table? |
Yes |
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What is a Feasible Successor Route? |
A route whose Reported Distance is lower than the successor router's Feasible Distance |
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What does EIGRP use if a successor route fails and no feasible successor exists? |
Uses Diffusing Update Algorithm (DUAL) |
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What command enters EIGRP config mode and sets the Autonomous System Number? |
Router eigrp <as-number> |
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What command explicitly sets the router ID? |
Eigrp router-id |
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What command sets the Hello interval? |
Ip hello-interval eigrp |
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What command will set the hold timer? |
Ip hold-time eigrp |
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What 2 formats can the "network" command take? |
"<subnet> <wildcard mask>" or "<subnet>" (assumes classful networking) |
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What 3 tables does EIGRP use? |
The neighbor table, topology table, and routing table |
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What command will show all interfaces on which EIGRP is enabled? |
Show ip eigrp interfaces |
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How do passive interfaces behave? |
They advertise their own subnets but will not form neighbor relationships |
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What value does EIGRP use to list neighbors? |
Interface ID (not router ID) |
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How does Equal-Cost Load Balancing work? |
EIGRP will load-balance across multiple routes with the same metric (up to maximum-paths) |
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How does Unequal Cost Load Balancing work? |
It uses variance to determine which feasible successor routes should count as equal cost for load balancing |
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What are the possible values for variance? |
1-128 |
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How does Unequal Cost Load Balancing determine if a route should be included in load balancing? |
The metric of all feasible successors is multiplied by variance and if equal to or lower than the metric of the successor route it is included |
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What command will log messages for EIGRP packet flow? |
Debug eigrp packets |
