ENARSI - capítulo 3

What is the default EIGRP hello timer for a high-speed interface (in seconds)?

• 1

• 5

• 10

• 20

• 60

Answer explanation

EIGRP uses a default hello timer of 5 seconds for high-speed interfaces.

What is the default EIGRP hello timer for a low-speed interface (in seconds)?

• 1

• 5

• 10

• 30

• 60

Answer explanation

EIGRP uses a default hello timer of 60 seconds for low-speed interfaces.

When a path is identified using EIGRP and in a stable fashion, the route is considered _____.

• passive

• dead

• active

• alive

Answer explanation

EIGRP considers stable paths to be passive.

How does an EIGRP router indicate that a path computation is required for a specific route?

• EIGRP sends out an EIGRP update packet with the topology change notification flag set.

• EIGRP sends out an EIGRP update packet with a metric value of zero.

• EIGRP sends out an EIGRP query with the delay set to infinity.

• EIGRP sends a route withdrawal, notifying other neighbors to remove the route from the topology table.

Answer explanation

EIGRP sends out a query packet with the delay set to infinity to indicate that a route has gone active.

True or false: EIGRP summarization is performed with the command summary-aggregate network subnet-mask under the EIGRP process for classic mode configuration.

• True

• False

Answer explanation

Summarization of prefixes involves using the interface command ip summary-address eigrp as-number network subnet-mask for classic EIGRP configuration.

True or false: EIGRP automatic summarization is enabled by default and must be disabled to prevent issues with networks that cross classful network boundaries.

• True

• False

Answer explanation

Current IOS XE releases have automatic summarization disabled by default.

True or false: EIGRP stub site functions can be deployed at all branch sites, regardless of whether downstream EIGRP routers are present.

• True

• False

Answer explanation

The EIGRP stub site function removes the limitations of a classic EIGRP stub router by allowing for routes from downstream routers to be advertised outside WAN interfaces.

How do EIGRP offset lists manipulate a route?

• Completely removing a set of specific routes

• Reducing the total path metric to a more preferred value

• Adding the total path metric to a specific set of routes

• Adding delay to the path metric for a specific set of routes

Answer explanation

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.

If the timers do not match, EIGRP neighbors can still form an adjacency?

• Yes, always

• No, never

• Yes, but the hellos must be received before the hold time reaches zero.

• No, but the routers keep exchanging routing information

Scaling an EIGRP topology depends on

• nothing. Is automatic.

• using multiple AS.

• adjusting the timers.

• summarizing routes in a hierarchical fashion.