200-301 · Question #814
Which statement describes the effect of the overload keyword in the ip nat inside source list 90 interface ethernet 0/0 overload command?
The correct answer is D. Addressesthat match access list90are translated through PAT to the IP address of the Ethernet. The overload keyword in a NAT command enables Port Address Translation (PAT), allowing multiple internal IP addresses matching access list 90 to share the single public IP address of the Ethernet 0/0 interface.
Question
Options
- AAddresses that match access listinsideare translated to the IP address of the Ethernet 0/0
- BHosts that match access listinsideare translated to an address in the Ethernet 0/0 network.
- CHosts on the Ethernet 0/0 LAN are translated to the address pool in access list90.
- DAddressesthat match access list90are translated through PAT to the IP address of the Ethernet
How the community answered
(43 responses)- B2% (1)
- C2% (1)
- D95% (41)
Why each option
The overload keyword in a NAT command enables Port Address Translation (PAT), allowing multiple internal IP addresses matching access list 90 to share the single public IP address of the Ethernet 0/0 interface.
The option references "access list inside," but the command specifies access list 90, making this statement inaccurate regarding the ACL used.
This option incorrectly refers to "access list inside" and implies translation to "an address in the Ethernet 0/0 network," which is vague and does not precisely describe PAT to the interface's IP.
This option incorrectly states that hosts on Ethernet 0/0 are translated to an address pool in access list 90. Access list 90 defines the source addresses to be translated, not an address pool for translation.
The overload keyword enables Port Address Translation (PAT). This allows multiple internal private IP addresses that match access list 90 to be translated to a single public IP address, specifically the IP address assigned to the Ethernet 0/0 interface, using distinct port numbers to distinguish sessions.
Concept tested: Port Address Translation (PAT) / NAT Overload
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-16/nat-xe-16-book/nat-overview.html
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