ccna which of the following describe router functions?(choos

ccna which of the following describe router functions?(choose four)
which of the following describe router functions?(choose four)
A.Packet switching
B.Collision prevention
C.Packet filtering
D.Broadcast domain enlargement
E.Internetwork communication
F.Broadcast forwarding
G.Path selection
ACEG 我想问,为什么不选B,路由器不是也可以分割冲突域吗