Examgood 200-125 CCNA Routing and Switching study guide pdf

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Which of the following describes the roles of devices in a WAN? (Choose three.) 
A. A CSU/DSU terminates a digital local loop. 
B. A modem terminates a digital local loop. 
C. A CSU/DSU terminates an analog local loop. 
D. A modem terminates an analog local loop. 
E. A router is commonly considered a DTE device. 
F. A router is commonly considered a DCE device. 
Answer: A,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

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

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

A network administrator is verifying the configuration of a newly installed host by establishing an FTP connection to a remote server. What is the highest layer of the protocol stack that the network administrator is using for this operation? 
A. application 
B. presentation 
C. session 
D. transport 
E. internet 
F. data link 
Answer: A

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