CCNA вопросы и ответы для интервью
Вопрос 21. Explain the concept of VLAN (Virtual Local Area Network).
VLANs logically segment a network into smaller broadcast domains, improving performance and security by isolating traffic.
Вопрос 22. What is the role of a router in a network?
A router connects different networks and directs data between them based on IP addresses. It operates at the network layer (Layer 3) of the OSI model.
Вопрос 23. What is the difference between a hub, switch, and router?
A hub operates at the physical layer, a switch at the data link layer, and a router at the network layer. Routers connect networks, switches forward data within a network, and hubs broadcast data to all connected devices.
Вопрос 24. What is NAT (Network Address Translation) and why is it used?
NAT allows multiple devices on a local network to share a single public IP address, providing security and conserving IP addresses.
Вопрос 25. Explain the purpose of ICMP (Internet Control Message Protocol).
ICMP is used to send error messages and operational information about network conditions. It is commonly used for troubleshooting.
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