Which two types of traffic are blocked when the storm control threshold for multicast traffic is
reached on a port? (Choose two.)
A.
BPDU
B.
OSPF
C.
CDP
D.
IS-IS
E.
LLDP
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B & D are correct.
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D is incorrect as IS-IS doesn’t use multicast.
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http://www.ciscopress.com/articles/article.asp?p=26850&seqNum=5
As discussed in the preceding section, all IS-IS routers connected over a common LAN multicast hellos to well-known addresses, thereby forming adjacencies with each other.
D is correct.
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aren’t BPDU and CDP multicast as well? Or does storm control only catch layer 3 protocols?
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http://www.cisco.com/en/US/docs/switches/lan/catalyst3850/software/release/3.2_0_se/multibook/configuration_guide/b_consolidated_config_guide_3850_chapter_011100.html
When the storm control threshold for multicast traffic is reached, all multicast traffic except control traffic, such as bridge protocol data unit (BDPU) and Cisco Discovery Protocol (CDP) frames, are blocked. However, the switch does not differentiate between routing updates, such as OSPF, and regular multicast data traffic, so both types of traffic are blocked.
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