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Difficulty: EasyNAT and PAT Implementation

A network technician needs to configure a router so that multiple workstations on an internal private network can access external web resources simultaneously using a single public IP address assigned by the ISP. Which address translation technology accomplishes this by assigning unique Layer 4 port numbers to each session?

  1. Port Address Translation (PAT)Answer
  2. B
    Static NAT
  3. C
    Dynamic NAT
  4. D
    Port Forwarding

Answer

Port Address Translation (PAT)
Port Address Translation (PAT), often referred to as NAT Overload, enables multiple hosts on a private network to share a single public IP address simultaneously by translating both the IP address and Layer 4 port numbers for outbound connections.

Step-by-Step Solution

1
Analyze the operational requirement
Multiple internal workstations with private addresses need internet access sharing one public IP address.
The ISP has supplied only a single public IP address for all outbound host connections.
2
Identify the tracking mechanism used at Layer 4
Unique source port numbers are combined with the single public IP address.
Translating Layer 4 port numbers allows the router to keep track of individual host sessions on a single IP address.
3
Select the correct NAT implementation
Port Address Translation (PAT) / NAT Overload is selected.
PAT specifically translates private IP addresses and source port numbers to a shared public IP address.

Key Concept

Port Address Translation (PAT) / NAT Overload
Estimated Time:45s
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Topics

NAT and PAT Implementation

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