CCNA 面试题与答案
Test your skills through the online practice test: CCNA Quiz Online Practice Test
问题 11. What is the purpose of a firewall in network security?
A firewall monitors and controls incoming and outgoing network traffic based on predetermined security rules, preventing unauthorized access.
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问题 12. Explain the role of the OSI model's Session layer.
The Session layer manages sessions (connections) between applications. It establishes, maintains, and terminates communication sessions.
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问题 13. What is the purpose of the NTP (Network Time Protocol) in networking?
NTP is used to synchronize the clocks of devices on a network, ensuring accurate timekeeping for various applications and services.
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问题 14. Explain the purpose of the MAC address in networking.
The MAC address is a unique identifier assigned to a network interface card (NIC) to enable communication within a network segment.
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问题 15. What is the purpose of the 802.1X standard in network security?
802.1X provides port-based network access control, requiring authentication before allowing devices to connect to a LAN.
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用户评价最有帮助的内容：
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