EIGRP is being used as the routing protocol on the Company network. While troubleshooting some
network connectivity issues, you notice a large number of EIGRP SIA (Stuck in Active) messages.
What causes these SIA routes? (Select two)
A.
The neighboring router stops receiving ACK packets from this router.
B.
The neighboring router starts receiving route updates from this router.
C.
The neighboring router is too busy to answer the query (generally caused by high CPU
utilization).
D.
The neighboring router is having memory problems and cannot allocate the memory to
process the query or build the reply packet.
Explanation:
SIA routes are due to the fact that reply packets are not received. This could be caused by a router
which is unable to send reply packets. The router could have reached the limit of its capacity, or it
could be malfunctioning.
Incorrect Answers
A: Missing replies, not missing ACKs, cause SIA.
B: Routes updates do not cause SIA.
Notes: If a router does not receive a reply to all outstanding queries within 3 minutes, the route goes
to the stuck in active (SIA) state. The router then resets the neighbors that fail to reply by going
active on all routes known through that neighbor, and it re-advertises all routes to that neighbor.
Reference: Enhanced Interior Gateway Routing Protocol
http://www.cisco.com/warp/public/103/eigrp3.html