A network architect is designing a highly redundant network with a distance vector routing protocol in order to
prevent routing loops, the architect has configured the routers to advertise failed routes with the addition of an
infinite metric. Which of the following methods has the architect chosen?

A.
Spanning tree

B.
Split horizon

C.
Route poisoning

D.
Hold down timers

Explanation:
https://books.google.co.za/books?id=C5G6DAAAQBAJ&pg=PT1507&lpg=PT1507&dq=advertise+failed+routes
+with+the+addition+of+an+infinite
+metric&source=bl&ots=hPhUeuDuis&sig=d2zmlLrjHOSadqWLfeFEPjfNJjU&hl=en&sa=X&ved=0ahUKEwi_z9
Gr5vXQAhUhJMAKHRFHCeQQ6AEIGjAA#v=onepage&q=advertise%20failed%20routes%20with%20the%
20addition%20of%20an%20infinite%20metric&f=false