200-301 · Question #125
Refer to the exhibit. Which feature is enabled by this configuration?
The correct answer is C. a dynamic NAT address pool. The provided configuration, defining an ip nat pool and linking it to an access-list with ip nat inside source list <acl> pool <pool_name>, enables dynamic Network Address Translation (NAT).
Question
Refer to the exhibit. Which feature is enabled by this configuration?
Options
- Astatic NAT translation
- Ba DHCP pool
- Ca dynamic NAT address pool
- DPAT
How the community answered
(50 responses)- A8% (4)
- B2% (1)
- C86% (43)
- D4% (2)
Why each option
The provided configuration, defining an `ip nat pool` and linking it to an access-list with `ip nat inside source list <acl> pool <pool_name>`, enables dynamic Network Address Translation (NAT).
Static NAT involves a one-to-one, permanent mapping between specific private and public IP addresses, typically configured with `ip nat inside source static` commands, which are not present here.
A DHCP pool is used to assign IP addresses to client devices within a network and is configured with `ip dhcp pool` commands, unrelated to NAT functionality.
The command `ip nat pool MY_POOL 209.165.201.10 209.165.201.20 netmask 255.255.255.224` defines a pool of global (public) IP addresses. The subsequent command `ip nat inside source list 1 pool MY_POOL` instructs the router to dynamically translate private IP addresses matching access-list 1 to an available public IP address from this defined pool, thus enabling dynamic NAT.
PAT (Port Address Translation) or NAT Overload, allows multiple private IP addresses to share a single public IP address using different port numbers. This is typically indicated by the `overload` keyword or a pool with a single IP, not explicitly by the range-based `ip nat pool` command shown.
Concept tested: Dynamic NAT pool configuration
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-3s/nat-xe-3s-book/iadnat-basic-nat.html#d500696e106
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