200-301 · Question #715
How does NAT overloading provide one-to-many address translation?
The correct answer is C. It assigns a unique TCP/UDP port to each session. NAT overloading, also known as Port Address Translation (PAT), allows multiple private IP addresses to share a single public IP address by assigning unique TCP/UDP port numbers to each session.
Question
How does NAT overloading provide one-to-many address translation?
Options
- AIt uses a pool of addresses
- BIt converts IPV4 addresses to unused IPv6 Addresses
- CIt assigns a unique TCP/UDP port to each session
- DIt uses virtual MAC Address and Virtual IP Addresses
How the community answered
(30 responses)- A3% (1)
- C90% (27)
- D7% (2)
Why each option
NAT overloading, also known as Port Address Translation (PAT), allows multiple private IP addresses to share a single public IP address by assigning unique TCP/UDP port numbers to each session.
While NAT can use a pool of addresses (dynamic NAT), NAT overloading specifically refers to the use of a single public IP address for many internal hosts, differentiated by port numbers.
NAT overloading operates within IPv4 networks and does not involve converting addresses to IPv6.
NAT overloading (PAT) distinguishes between multiple internal hosts using the same public IP address by assigning a unique source TCP or UDP port number to each outbound connection.
NAT overloading is an IP layer (Layer 3) translation mechanism and does not directly involve virtual MAC addresses or solely virtual IP addresses in the way described.
Concept tested: NAT overloading (PAT) mechanism
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-3s/nat-xe-3s-book/iadnat-ovrload-pat.html
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