Computer Networking
The physical layer, in reference to the OSI model, defines

data link procedures that provide for the exchange of data via frames that can be sent and received
the interface between the X.25 network and packet mode device
All of these
the virtual circuit interface to packet-switched service
None of these

ANSWER DOWNLOAD EXAMIANS APP

Computer Networking
Ethernet networks can be cabled in a number of topologies, depending on what works best in each environment. As more nodes are added, the efficiency of Ethernet decreases. Select the best answer as to why Ethernet becomes less efficient as size increases.

Cable terminators do not reflect the signal properly
Network collisions occur
"Line echo" occurs due to the impedance of the cable
Cable terminators do not absorb the signal properly
Repeaters cannot increase the signal strength sufficiently

ANSWER DOWNLOAD EXAMIANS APP