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Chapter 9
Multicast
17.
A, D. We are discussing multicast in this chapter, so unicast is not a
valid answer. Because there are only two directions on a tree, the cor-
rect answers are bidirectional and unidirectional.
18.
C. TTY is a telecommunications term, and IP access lists are not
multicast attributes. TTL thresholds are used to compare against the
TTL value of a multicast packet. Disabling multicast on the router
works, but it isn't necessarily an attribute.
19.
A, B, C. The problem with D is that PIM SM is based on unidirec-
tional shared root tree distribution.
20.
B. Answers C and D are actually similarities between the two proto-
cols. PIM SM uses unidirectional shared root tree distribution.
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