How many collision domains are in a LAN with four hubs and two bridges that are connected directly to each
other, as shown in the following figure? (Click the Exhibit(s) button.)

A.
four

B.
five

C.
six

D.
fourteen

Explanation:
A bridge segments the LAN into separate collision domains. The figure in this scenario has five segments
created between these two bridges. Therefore, there will be five collision domains (segments) on the LAN if the
two bridges are directly connected as shown in the exhibit. Hubs do not create LAN segments; they act as port
aggregators and signal amplifiers.
It is also worth noting that with no router in the diagram, the entire network is a single broadcast domain. If a
router were present, each of its interfaces could host a different subnet and each of those same interfaces
would be a separate broadcast domain.Objective:
LAN Switching Fundamentals
Sub-Objective:
Describe and verify switching concepts

Internetwork Design Guide — Designing Switched LAN Internetworks > Comparison of LAN Switches and
Routers