[Solved] A router with NAT enabled has one public IP address and three devices... If all three devices access the internet simultaneously, what will happen to their source IP addresses in outgoing packets? | Computer Networks

Computer Networks - IP Addressing

A router with NAT enabled has one public IP address and three devices inside with private IPs. If all three devices access the internet simultaneously, what will happen to their source IP addresses in outgoing packets?

AThe devices will keep their private IP addresses

BEach device will use a unique public IP address

CAll three devices will share the same public IP with different port numbers

DThe router will block all but one device

Step-by-Step Solution

Solution:

Step 1: Understand NAT overload (PAT) behavior
With one public IP, NAT uses port numbers to differentiate devices, allowing multiple devices to share the same public IP.
Step 2: Eliminate other options
Unique public IPs require multiple addresses; private IPs are not used outside; blocking devices is unrelated.
Final Answer:
All three devices will share the same public IP with different port numbers -> Option C
Quick Check:
NAT overload = shared IP with ports [OK]

Quick Trick: NAT overload shares one IP with unique ports per device [OK]

Common Mistakes:

MISTAKES

Assuming each device gets a unique public IP
Thinking private IPs are sent outside
Believing router blocks multiple devices

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If all three devices access the internet simultaneously, what will happen to their source IP addresses in outgoing packets?

Step 1: Understand NAT overload (PAT) behavior

Step 2: Eliminate other options

Final Answer:

Quick Check:

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