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Share some CCNA Routing and Switching 200-125 exam questions and answers below.
For what two purposes does the Ethernet protocol use physical addresses? (Choose two.) 
A. to uniquely identify devices at Layer 2 
B. to allow communication with devices on a different network 
C. to differentiate a Layer 2 frame from a Layer 3 packet 
D. to establish a priority system to determine which device gets to transmit first 
E. to allow communication between different devices on the same network 
F. to allow detection of a remote device when its physical address is unknown 
Answer: A,E

A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame is then discarded. At which OSI layer did this happen? 
A. session 
B. transport 
C. network 
D. data link 
E. physical 
Answer: D

Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication? 
A. transport 
B. network 
C. presentation 
D. session 
E. application 
Answer: E

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