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Difficulty: EasyInside Source NAT and PAT Configuration and Verification

To permit multiple internal private hosts to share the single public IPv4 address assigned to the GigabitEthernet0/0/0 WAN interface, which Cisco IOS command correctly implements Port Address Translation (PAT) for traffic permitted by Access Control List 15?

  1. ip nat inside source list 15 interface GigabitEthernet0/0/0 overloadAnswer
  2. B
    ip nat inside source list 15 interface GigabitEthernet0/0/0
  3. C
    ip nat outside source list 15 interface GigabitEthernet0/0/0 overload
  4. D
    ip nat inside source static list 15 interface GigabitEthernet0/0/0

Answer

The command 'ip nat inside source list 15 interface GigabitEthernet0/0/0 overload' correctly enables Port Address Translation (PAT).
The command specifying 'ip nat inside source list 15 interface GigabitEthernet0/0/0 overload' correctly binds the access list to the egress interface and appends the 'overload' keyword, which enables Port Address Translation (PAT) so multiple internal devices can share a single public IPv4 address.

Step-by-Step Solution

1
Identify the requirement for Port Address Translation (PAT)
Multiple internal hosts sharing a single public interface IP requires PAT (overload).
PAT uses unique source port numbers to track connections for multiple internal hosts behind a single IP address.
2
Formulate the Cisco IOS PAT interface command syntax
The correct command structure is 'ip nat inside source list <acl> interface <interface> overload'.
The 'inside source list' parameter references the internal traffic ACL, 'interface' specifies the egress IP source, and 'overload' enables port multiplexing.

Key Concept

Port Address Translation (PAT) Interface Overload Configuration
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Topics

Inside Source NAT and PAT Configuration and Verification

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