Network Address Translation Questions and Answers
Network Address Translation (NAT) is a critical networking concept widely used in routers and firewalls to manage IP address mapping between private and public networks. This section features networking interview questions and answers that focus on NAT configuration, benefits, and real-world scenarios. Whether preparing for Cisco CCNA, Infosys, HCL, or other IT placements, understanding NAT concepts is key to clearing both technical and HR rounds. The questions cover static, dynamic, and PAT mechanisms with practical examples. Strengthen your networking knowledge with detailed placement papers with answers, ideal for students and professionals aiming to excel in networking roles.
Network Address Translation
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43 questions
31. What does NAT NOT change in packets?
- Source IP
- Destination IP
- MAC address
- Source port
32. What happens when NAT mapping table is full?
- Router crashes
- New connections are denied
- Old entries get deleted automatically
- NAT stops working permanently
33. Which NAT variant allows the same internal IP to be mapped to different external IPs at different times?
- Static NAT
- Dynamic NAT
- PAT
- DNAT
34. NAT causes which known problem for some applications?
- Time synchronization
- End-to-end connectivity loss
- Increased DHCP scope
- Memory leakage
36. Which NAT operation modifies both IP address and TCP/UDP port?
- Static NAT
- Port mapping
- PAT
- Destination NAT
37. For inbound connections to a server inside NAT, which feature is required?
- Port forwarding
- RIP updates
- DHCP relay
- ARP proxy
39. Which command type is used on routers for NAT configuration?
- ip default-network
- ip nat inside / ip nat outside
- ip helper-address
- ip routing
40. Which NAT feature ensures replies return correctly to the original internal host?
- Connection tracking
- Port mirroring
- DHCP lease
- Route summarization