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EIGRP DUAL FSM (Finite State Machine)

1. What is the default EIGRP hello timer for a high-speed interface?
        5 seconds 
2. What is the default EIGRP hello timer for a low-speed interface?
        60 seconds 
3. When a path is identified using EIGRP and in a stable fashion, the route is considered _____.
        passive
4. How does an EIGRP router indicate that a path computation is required for a specific route?
       sends out a query packet with the delay set to infinity
5. EIGRP summarization is performed with the command summary-aggregate network subnet-mask under the EIGRP process for classic mode configuration.
      False Summarization of prefixes involves using the interface command ip summary-address eigrp as-number network subnet-mask for classic EIGRP configuration.
6. EIGRP automatic summarization is enabled by default and must be disabled to prevent issues with networks that cross classful network boundaries.
      False Current IOS XE releases have automatic summarization disabled by default.
7. EIGRP stub site functions can be deployed at all branch sites, regardless of whether downstream EIGRP routers are present.
      True
8. How do EIGRP offset lists manipulate a route?
      Adding delay to the path metric for a specific set of routes
      Eigrp adds to the total path metric by adding delay to the path calculations. 
      It never adds a raw number to the total path metric.

Failure Detection and Timers
    hold time: 15, 180 slow-speed interfaces
    hello timer modified:  (config-if)ip hello-interval eigrp as-number seconds
    hold timer  modified:  (config-if)ip hold-time eigrp as-number seconds
    active timer -default value of 3 minutes (180 seconds)
    EIGRP waits half of the active timer value (90 seconds) for a reply
    not receive a response within 90 seconds, the originating router sends a SIA query to EIGRP neighbors that did not respond
    

EIGRP uses protocol number ____ for inter-router communication.		==== 88
How many packet types does EIGRP use for inter-router communication? ==== 5
What is required to match to form an EIGRP adjacency? === K values, Primary subnet match, ASN, Auth.
What is an EIGRP successor? ==== The first next-hop router for the successor route.
What attributes does the EIGRP topology table contain? ====Network prefix, who advertised that prefix, Metrics, Values 
What destination addresses does EIGRP use when feasible? ==== 224.0.0.10
The EIGRP process is initialized by which technique? ==== router eigrp as-number or router eigrp process-name
The EIGRP router ID (RID) must be configured for EIGRP to be able to establish neighborship. False,  dynamically selects an IPv4 address as the RID.
Which value can be modified on a router to manipulate the path taken by EIGRP but does not have impacts on other routing protocols, like OSPF? =interface delay

Successor route	 ====The route with the lowest path metric to reach a destination.
Successor 		 ====The first next-hop router for the successor route.
Feasible distance (FD) ====The metric value for the lowest-metric path to reach a destination.
Reported distance (RD) ====Distance reported by a router to reach a prefix
			 The reported distance value is the feasible distance for the advertising router.
Feasibility condition	 ====For a route to be considered a backup route, the RD received for that route must be less than the FD calculated locally. 
Feasible successor	====A route with that satisfies the feasibility condition is maintained as a backup  		
                      The feasibility condition ensures that the backup route is loop free.

Topology Table
	contains information to identify loop-free backup routes
	contains all the network prefixes advertised within an EIGRP AS
EIGRP Neighbors
	EIGRP neighbors exchange the entire routing table when forming an adjacency, 
	and they advertise incremental updates only as topology changes occur within a network.	
Inter-Router Communication
	EIGRP uses five different packet types to communicate with other routers