210-250 · Question #62
Which technology allows a large number of private IP addresses to be represented by a smaller number of public IP addresses?
The correct answer is A. NAT. NAT (Network Address Translation) is the technology that maps multiple private IP addresses to one or more public IP addresses, conserving the IPv4 address space.
Question
Which technology allows a large number of private IP addresses to be represented by a smaller number of public IP addresses?
Options
- ANAT
- BNTP
- CRFC 1631
- DRFC 1918
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(30 responses)- A93% (28)
- C3% (1)
- D3% (1)
Why each option
NAT (Network Address Translation) is the technology that maps multiple private IP addresses to one or more public IP addresses, conserving the IPv4 address space.
NAT operates at the network layer to translate private IP addresses (defined in RFC 1918) into a smaller pool of public IP addresses, enabling many internal hosts to share internet access. It tracks active connections using a translation table that maps internal source IP and port pairs to a public IP and port. This is the core mechanism used by routers and firewalls to extend IPv4 address availability.
NTP (Network Time Protocol) is used to synchronize clocks across network devices, not to translate IP addresses.
RFC 1631 is the document that originally specified NAT, but it is a standards document - not a technology name; NAT is the correct term for the technology itself.
RFC 1918 defines the reserved private IP address ranges (10.x.x.x, 172.16-31.x.x, 192.168.x.x) but does not describe any translation mechanism.
Concept tested: Network Address Translation private-to-public IP mapping
Source: https://www.rfc-editor.org/rfc/rfc3022
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