CCNA 面试题与答案
Test your skills through the online practice test: CCNA Quiz Online Practice Test
问题 31. What is the role of a DNS (Domain Name System) server?
DNS translates human-readable domain names into IP addresses, facilitating the routing of data on the Internet.
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问题 32. What is the purpose of the subnet mask in networking?
The subnet mask defines the network and host portions of an IP address. It is used in conjunction with IP addresses for routing and addressing purposes.
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问题 33. What is OSPF (Open Shortest Path First) and how does it work?
OSPF is a link-state routing protocol that calculates the shortest path to a destination based on a SPF (Shortest Path First) algorithm.
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问题 34. Explain the concept of QoS (Quality of Service) in networking.
QoS ensures that network traffic is prioritized based on specific criteria, such as bandwidth, latency, and packet loss, to meet performance requirements.
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问题 35. What is the purpose of ACLs (Access Control Lists) in routing?
ACLs control traffic flow by permitting or denying packets based on defined rules. They are commonly used for security and traffic filtering.
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用户评价最有帮助的内容：
- What is the purpose of ARP (Address Resolution Protocol)?
- Explain the purpose of the DHCP (Dynamic Host Configuration Protocol).
- What is the role of a router in a network?
- What is the purpose of the subnet mask in networking?
- What is the difference between static routing and dynamic routing?