use to crash 

would crash 

crashes

was crashing 

have been implementing 

were implementing 

have implemented 

implemented 

was installing 

had installed 

installed

installs

is containing 

contained

has contained 

contains

would to use 

used to 

used 

were using 

is testing 

tests

has tested 

was testing 

Directly storing and processing data on the network 

Connecting similar or dissimilar types of networks 

Only allowing data traffic intended for other networks 

Filtering unwanted traffic from clogging the backbone 

To link different network segments and manage data flow within an organization 

To provide internet access to LANs 

To connect multiple cities 

To filter traffic within a single network segment 

Through the internet only 

Through coaxial cables only 

Through satellite and microwave relays 

Through direct wired connections 

Connects two LANs with different configurations 

Expands networks by connecting to the internet 

Interconnects multiple network segments and finds alternative routes 

Provides a connection between routers