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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

Which three statements accurately describe Layer 2 Ethernet switches? (Choose three.) 
A. Spanning Tree Protocol allows switches to automatically share VLAN information. 
B. Establishing VLANs increases the number of broadcast domains. 
C. Switches that are configured with VLANs make forwarding decisions based on both Layer 2 and Layer 3 address information. 
D. Microsegmentation decreases the number of collisions on the network. 
E. In a properly functioning network with redundant switched paths, each switched segment will contain one root bridge with all its ports in the forwarding state. All other switches in that broadcast domain will have only one root port. 
F. If a switch receives a frame for an unknown destination, it uses ARP to resolve the address. 
Answer: B,D,E

What is the difference between a CSU/DSU and a modem? 
A. A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line. 
B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line. 
C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line. 
D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line. 
Answer: D

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