CCNA Question - Routing Protocol theory

Answered Question
Apr 3rd, 2010
User Badges:

Chapter 8 - Routing Protocol Theory

Question 9:  An internetwork is using a link-state routing protocol.  the routers have flooded all LSAs, and the network is stable.  Which of the following describes what the routers will do to reflood the LSAs?


a- Each router refloods each LSA using periodic timer that has a time similar to distance vector update timers.

b- Each router refloods each LSA using a periodic timer that is much longer than distance vector update timers.

c- The routers never reflood the LSAs as long as the LSAs do not change.

d- The routers reflood all LSAs whenever one LSA changes.


Now I picked "b and d" but the answer was "b" only.  Can some one explain why  not "d" also?  Because whenever an LSA changes routers reflood.

Correct Answer by Jon Marshall about 6 years 11 months ago

Your right, when an LSA changes it will be flooded out again. But question d is -


d- The routers reflood all LSAs whenever one LSA changes.


the routers do not reflood ALL LSAs, only the LSAs that have changed.


Jon


Cisco are currently donating money to the Haiti earthquake appeal for every rating so please consider rating all helpful posts.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
Loading.
Correct Answer
Jon Marshall Sun, 04/04/2010 - 14:55
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

Your right, when an LSA changes it will be flooded out again. But question d is -


d- The routers reflood all LSAs whenever one LSA changes.


the routers do not reflood ALL LSAs, only the LSAs that have changed.


Jon


Cisco are currently donating money to the Haiti earthquake appeal for every rating so please consider rating all helpful posts.

challc2008 Sun, 04/04/2010 - 16:30
User Badges:

Aha, that is right.  I gotta be careful with the wording.  Thank you.

Jon Marshall Sun, 04/04/2010 - 16:39
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

No problem, glad to help.


It's all down to the wording with Cisco exams


Jon

Actions

This Discussion