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A network engineer is asked to configure a "site-to-site" IPsec VPN tunnel. One of the last things that the engineer does is to configure an access list (access-list 1 permit any) along with the command ipnat inside source list 1 int s0/0 overload. Which functions do the two commands serve in this scenario?
Correct Answer: D
Explanation/Reference: Explanation: Configuring NAT to Allow Internal Users to Access the Internet Using Overloading NAT Router interface ethernet 0 ip address 10.10.10.1 255.255.255.0 ipnat inside !--- Defines Ethernet 0 with an IP address and as a NAT inside interface. interface ethernet 1 ip address 10.10.20.1 255.255.255.0 ipnat inside !--- Defines Ethernet 1 with an IP address and as a NAT inside interface. interface serial 0 ip address 172.16.10.64 255.255.255.0 ipnat outside !--- Defines serial 0 with an IP address and as a NAT outside interface. ipnat pool ovrld 172.16.10.1 172.16.10.1 prefix 24 ! !--- Defines a NAT pool named ovrld with a range of a single IP !--- address, 172.16.10.1. ipnat inside source list 7 pool ovrld overload ! ! ! ! !--- Indicates that any packets received on the inside interface that !--- are permitted by access-list 7 has the source address !--- translated to an address out of the NAT pool named ovrld. !--- Translations are overloaded, which allows multiple inside !--- devices to be translated to the same valid IP address. access-list 7 permit 10.10.10.0 0.0.0.31 access-list 7 permit 10.10.20.0 0.0.0.31 !--- Access-list 7 permits packets with source addresses ranging from !--- 10.10.10.0 through 10.10.10.31 and 10.10.20.0 through 10.10.20.31. Note in the previous second configuration, the NAT pool "ovrld"only has a range of one address. The keyword overload used in the ipnat inside source list 7 pool ovrld overload command allows NAT to translate multiple inside devices to the single address in the pool. Reference: http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094e77.shtml