CCNA 面试题与答案
问题 16. Explain the concept of CIDR (Classless Inter-Domain Routing).
CIDR is a method of allocating IP addresses and routing IP packets based on variable-length subnet masking, improving the efficiency of address space usage.
问题 17. What is the purpose of the OSI model?
The OSI model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven abstraction layers.
问题 18. Explain the difference between TCP and UDP.
TCP (Transmission Control Protocol) is connection-oriented, ensuring reliable data delivery. UDP (User Datagram Protocol) is connectionless and provides faster, but less reliable, data transmission.
问题 19. What is subnetting and why is it used?
Subnetting is the process of dividing a network into sub-networks to improve performance and security. It helps manage IP addresses more efficiently.
问题 20. What is the purpose of ARP (Address Resolution Protocol)?
ARP is used to map a 32-bit IP address to a MAC address on a local network, allowing communication between devices.
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?