Cisco
200-101 · Question #163
200-101 Question #163: Real Exam Question with Answer & Explanation
The correct answer is C: overloading. NAT overloading (also called PAT - Port Address Translation) maps many private addresses to a single public IP by using unique source port numbers to track each session.
Question
Which form of NAT maps multiple private IP addresses to a single registered IP address by using different ports?
Options
- Astatic NAT
- Bdynamic NAT
- Coverloading
- Doverlapping
- Eport loading
Explanation
NAT overloading (also called PAT - Port Address Translation) maps many private addresses to a single public IP by using unique source port numbers to track each session.
Common mistakes.
- A. Static NAT creates a permanent one-to-one mapping between a single inside local address and a single inside global address and does not use port multiplexing.
- B. Dynamic NAT maps inside local addresses to addresses drawn from a pool of registered IP addresses, still maintaining a one-to-one ratio per active session without port-based multiplexing.
- D. Overlapping NAT is used when the inside and outside networks use the same IP address space, requiring translation on both sides, and is unrelated to port-based multiplexing.
- E. 'Port loading' is not a standard Cisco NAT term; the correct term for this functionality is overloading or PAT.
Concept tested. NAT overloading / PAT many-to-one translation
Reference. https://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/13772-12.html
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