BGP is generally applied to complex networks where routes change frequently. Frequent route flapping
consumes a large number of bandwidth and CPU resources, and even affects the normal operation of the
network. This is an unavoidable problem that cannot be solved in BGP.
On an OSPF network, an algorithm is used to prevent loops within an area, but loops may occur between
areas. Therefore, OSPF defines a loop prevention mechanism for inter-area routes. Which of the following
statements are true about the loop prevention mechanism?