CCNP Practice Question: Examine the following EIGRP configuration for…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  EIGRP will advertise the 192.168.0.0/22 summary route out of GigabitEthernet0/0 and create a discard route.

  Why this is correct

  The 'ip summary-address eigrp 2a1744 192.168.0.0 255.255.252.0' command configures manual EIGRP summarization on GigabitEthernet0/0. This causes the router to advertise the 192.168.0.0/22 summary prefix out of that interface instead of the individual more-specific routes. To prevent routing loops, the router also installs a discard route (a route to Null0) for the summary prefix, ensuring that any traffic matching the summary but not a specific route is dropped locally.

• ✗

  EIGRP will only accept routes within the 192.168.0.0/22 range on this interface.

  Why it's wrong here

  This command operates only on outbound advertisements; it summarizes the specific routes that EIGRP is sending out of GigabitEthernet0/0. It does not filter or restrict inbound routes accepted through that interface. Inbound route filtering would require a separate mechanism such as a distribute-list or a prefix-list applied to incoming updates.

• ✗

  The summary route will have a metric equal to the best metric among the component routes.

  Why it's wrong here

  Incorrect. The metric is derived from the component routes, but it is not necessarily the best metric; it is typically the best metric of the component routes, but the statement is not precise enough. The correct answer is A.

• ✗

  This command will cause EIGRP to automatically summarize routes to their classful boundaries.

  Why it's wrong here

  The 'ip summary-address eigrp' command performs manual, classless summarization to the exact prefix length specified (in this case /22). Automatic classful summarization, where routes are summarized to their default classful boundaries, is controlled by the 'auto-summary' command and is disabled by default for EIGRP IPv4. This command has no effect on the auto-summary setting; it simply creates a single manually-defined summary route.