N10-005 · Question #332
Using source port numbers as a way to keep track of connections is a characteristic of which of the following protocols?
The correct answer is D. PAT. Port Address Translation (PAT), also called NAT overload, allows multiple internal private IP addresses to share a single public IP address by mapping each internal connection to a unique source port number on the public side. The router tracks each session using the…
Question
Using source port numbers as a way to keep track of connections is a characteristic of which of the following protocols?
Options
- ATCP
- BUDP
- CNAT
- DPAT
How the community answered
(60 responses)- A2% (1)
- B2% (1)
- C5% (3)
- D92% (55)
Explanation
Port Address Translation (PAT), also called NAT overload, allows multiple internal private IP addresses to share a single public IP address by mapping each internal connection to a unique source port number on the public side. The router tracks each session using the combination of public IP and unique source port, enabling it to correctly forward return traffic to the right internal host. PAT is specifically defined by its use of source port numbers to differentiate connections. NAT (Network Address Translation) translates IP addresses but does not inherently use port numbers to track multiple simultaneous connections-that is PAT's role. TCP and UDP are transport protocols that use ports for multiplexing, but they do not use source ports as a tracking mechanism for address translation.
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