350-401 Question #787: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. What are two results of the NAT configuration? (Choose two.)

Options

• APackets with a destination of 200.1.1.1 are translated to 10.1.1.1 or .2, respectively.
• BA packet that is sent to 200.1.1.1 from 10.1.1.1 is translated to 209.165.201.1 on R1.
• CR1 looks at the destination IP address of packets entering S0/0 and destined for inside hosts.
• DR1 processes packets entering E0/0 and S0/0 by examining the source IP address.
• ER1 is performing NAT for inside addresses and outside address.

Explanation

NAT configuration involves translating source IP addresses for outbound traffic from inside hosts and translating destination IP addresses for inbound traffic directed to inside hosts.

Common mistakes.

• A. While a NAT rule might translate 200.1.1.1 to 10.1.1.1, the 'or .2, respectively' part implies a specific configuration not necessarily generic, and it's a specific instance of destination NAT which C covers generally.
• D. For packets entering E0/0 (inside), R1 examines the source IP, but for packets entering S0/0 (outside), it primarily examines the destination IP for NAT rules that translate to inside hosts, making the statement partially incorrect.

Concept tested. Static NAT behavior (inside source static, outside source static, packet flow)

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/15-mt/iad-nat-15-mt-book/iad-cfg-nat-static.html

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