350-401 Question #715: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. A network engineer must load balance traffic that comes from the NAT Router and is destined to 10.10.110.10, to several FTP servers. Which two commands sets should be applied? (Choose two). A. B. C. D. E.

Options

• Ainterface Gig0/0 ip address 10.10.110.1 255.255.255.0 ip nat inside interface Gig0/1 ip address 12.16.1.1 255.255.255.252 ip nat outside
• Bip nat pool ftp-pool 10.10.110.2 10.10.110.9 netmask 255.255.255.0 access-list 23 permit 10.10.110.10 ip nat inside destination-list 23 pool ftp-pool
• Cip nat pool ftp-pool 10.10.110.2 10.10.110.9 netmask 255.255.255.0 type rotary access-list 23 permit 10.10.110.10 ip nat inside destination-list 23 pool ftp-pool
• Dip nat pool ftp-pool 10.10.110.2 10.10.110.9 netmask 255.255.255.0 type rotary access-list 23 permit 10.10.110.10 ip nat outside destination-list 23 pool ftp-pool
• Einterface Gig0/0 ip address 10.10.110.1 255.255.255.0 ip nat outside interface Gig0/1 ip address 12.16.1.1 255.255.255.252 ip nat inside

Explanation

Option A correctly configures the NAT interfaces: Gig0/0 (facing the internal FTP servers at 10.10.110.x) is set as 'ip nat inside', and Gig0/1 (facing the NAT Router at 12.16.1.x) is set as 'ip nat outside'. Option C correctly implements destination NAT load balancing using 'ip nat inside destination-list' with 'type rotary', which is the Cisco IOS keyword required to enable round-robin load balancing across a pool of real servers when traffic destined for a virtual IP (10.10.110.10) arrives from the outside.

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