单项选择题

Which of the following OSI model layers is used for logical addressing?（）

A. Physical
B. Transport
C. Network
D. Data link

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单项选择题

Which of the following is the MOST efficient way to troubleshoot network problems?（）

A. Create an action plan
B. Implement and test a solution
C. Determine if anything has changed
D. Identity a probable cause

单项选择题

Physical and logical network diagrams are used for which of the following configuration management goals?（）

A. Track DHCP distribution
B. Compare MAC and IP addresses
C. Document Internet access history
D. Identity network devices

单项选择题

Computers on a small network are not able to receive new addresses from the DHCP server.
However, the administrator has checked the server and ensured it is connected, responding, and functional.
Which of the following is the MOST likely problem in this scenario?（）

A. The DHCP server has an incorrect gateway configured.
B. The DHCP server was incorrectly configured with a six hour lease time on addresses.
C. The DHCP server was incorrectly configured with no-expiring lease time on addresses.
D. The DNS server is no longer functional and internal name-address resolution is down.