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Difficulty: EasyInside Source NAT and PAT Configuration and Verification

To enable multiple internal devices to share the single public IPv4 address assigned to WAN interface Serial0/1/0 using Port Address Translation (PAT), which Cisco IOS command must be executed?

  1. ip nat inside source list 10 interface Serial0/1/0 overloadAnswer
  2. B
    ip nat inside source list 10 interface Serial0/1/0
  3. C
    ip nat outside source list 10 interface Serial0/1/0 overload
  4. D
    ip nat inside source list 10 pool 172.32.0.0 overload

Answer

The command 'ip nat inside source list 10 interface Serial0/1/0 overload' correctly configures PAT using an exit interface.
The correct command syntax for configuring Port Address Translation using an exit interface IP address is 'ip nat inside source list <acl-number> interface <interface-id> overload'. The overload keyword tells the router to track transport-layer port numbers to allow multiple private IP addresses to share a single public IP address.

Step-by-Step Solution

1
Identify the source traffic matched by Access Control List 10.
Internal IPv4 traffic is designated for NAT translation.
The 'list 10' parameter specifies which source addresses undergo translation.
2
Specify the egress interface for translation.
The public IPv4 address of interface Serial0/1/0 is selected as the translation target.
The 'interface Serial0/1/0' clause tells the router to use the interface's dynamic or static public IP address.
3
Append the 'overload' keyword.
Port Address Translation (PAT) is enabled using transport layer port numbers.
The 'overload' keyword allows multiple internal sockets to share the single interface IP address simultaneously.

Key Concept

Port Address Translation (PAT) Interface Overload Configuration
Estimated Time:45s
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Topics

Inside Source NAT and PAT Configuration and Verification

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