CCNA 面试题与答案
Test your skills through the online practice test: CCNA Quiz Online Practice Test
问题 26. What is the significance of the 802.1Q standard in networking?
802.1Q is a standard for VLAN tagging in Ethernet networks, allowing the identification of VLAN membership within Ethernet frames.
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问题 27. Explain the purpose of the TCP three-way handshake.
The TCP three-way handshake is used to establish a reliable connection between two devices. It involves SYN, SYN-ACK, and ACK messages.
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问题 28. What is the difference between a collision domain and a broadcast domain?
A collision domain is a network segment where collisions can occur, typically in Ethernet networks. A broadcast domain is a logical division of a network, where broadcasts are confined.
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问题 29. What is STP (Spanning Tree Protocol) and why is it important?
STP prevents loops in Ethernet networks by blocking redundant paths. It ensures a loop-free topology and rapid convergence in case of link failures.
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问题 30. Explain the purpose of the DHCP (Dynamic Host Configuration Protocol).
DHCP dynamically assigns IP addresses to devices on a network, simplifying network configuration and management.
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