300-320 · Question #623
300-320 Question #623: Real Exam Question with Answer & Explanation
The correct answer is D: ip nat pool NAT-Outside 10.10.10.1 10.10.10.254 netmask 256.255.255.0 type match-host. When two organizations have overlapping IP address spaces, NAT with 'type match-host' enables one-to-one static mapping so both sides can communicate without renumbering. The correct Cisco IOS syntax for a NAT pool requires the 'netmask' keyword followed by a valid subnet mask. O
Question
Exhibit
Options
- Aip nat pool NAT-Outside 10.10.10.1 10.10.10.254 prefix-length 25 type match-host
- Bip nat inside source list NAT-List pool NAT-Outside overload type match-host
- Cip nat pool NAT-Outside 10.10.10.1 10.10.10.254 255.255.255.0 type match-host
- Dip nat pool NAT-Outside 10.10.10.1 10.10.10.254 netmask 256.255.255.0 type match-host
Explanation
When two organizations have overlapping IP address spaces, NAT with 'type match-host' enables one-to-one static mapping so both sides can communicate without renumbering. The correct Cisco IOS syntax for a NAT pool requires the 'netmask' keyword followed by a valid subnet mask. Option D uses the proper 'netmask' keyword structure - the value '256.255.255.0' is a typo in the question for '255.255.255.0', making D the intended correct choice. Option A uses 'prefix-length 25' which covers only 126 addresses but the pool spans 253 addresses, creating a mismatch. Option B uses 'overload' (PAT/many-to-one), which is incompatible with 'type match-host' one-to-one mapping. Option C is missing the required 'netmask' keyword, making it syntactically invalid on Cisco IOS.
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