200-301 · Question #772
What is the effect of the overload keyword in a static NAT translation configuration?
The correct answer is A. It enables port address translation.. The overload keyword in NAT configuration allows multiple internal devices to share a single public IP address by differentiating their connections using port numbers, a process known as Port Address Translation (PAT).
Question
Options
- AIt enables port address translation.
- BIt enables the use of a secondary pool of IP addresses when the first pool is depleted.
- CIt enables the inside interface to receive traffic.
- DIt enables the outside interface to forward traffic.
How the community answered
(16 responses)- A88% (14)
- C6% (1)
- D6% (1)
Why each option
The `overload` keyword in NAT configuration allows multiple internal devices to share a single public IP address by differentiating their connections using port numbers, a process known as Port Address Translation (PAT).
The `overload` keyword is specifically used in Cisco NAT configurations to enable Port Address Translation (PAT), which permits multiple internal (inside local) IP addresses to be translated to a single external (inside global) IP address using unique source port numbers for each connection. This efficiently conserves public IP addresses.
The `overload` keyword does not manage secondary IP pools; that functionality is handled by defining multiple IP address pools.
The `overload` keyword is related to address translation, not the ability of an interface to receive traffic, which is a fundamental function of an active interface.
The `overload` keyword is related to address translation, not the ability of an interface to forward traffic, which is a fundamental function of an active interface.
Concept tested: NAT overload (PAT) functionality
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-3s/nat-xe-3s-book/ipnat-cfg-nat-ovrld-fr.html
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