Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

Chapter 4: IP Services (Domain 4)

 1.  C.  Network address translation (NAT) was created to slow the depletion of Internet 

addresses. It does this by translating RFC 1918 privatized addresses to one or many public 

IP addresses. It allows the packets to masquerade as the public IP address on the Internet 

until it is translated back to the private IP address. Classless Inter-Domain Routing 

(CIDR) is a notation used to express the network for a host. Classful addressing is the 

original addressing scheme for the Internet. Virtual private networks (VPNs) are used for 

remote access.

2. A.  The inside local address is the address local to the enterprise (private), and the address is 

inside the enterprise. The inside local address will almost always be an RCF 1918 address, 

unless NAT is being used for purposes other than enterprise Internet access. If NAT is 

used for Internet access, then the inside local address is any host address destined for the 

Internet through NAT. 192.168.1.1 is the router’s interface address used to communicate 

with inside local hosts during the NAT process. 179.43.44.1 is the inside global address 

for the NAT process. 198.23.53.3 is the outside global address for the NAT process.

 3.  C.  The inside global address is the address public to the enterprise. The address is inside 

of or controlled by the enterprise. The inside global address in this case is the public side 

of the NAT, which is Router A’s S0/0 IP address. 192.168.1.2 is the inside local address of 

the host computer. 192.168.1.1 is the router’s interface address used to communicate with 

inside local hosts during the NAT process. 198.23.53.3 is the outside global address for 

the NAT process.

 4.  D.  The outside global address is the address public to the enterprise. The address is 

outside of the enterprise or outside of its control. When using NAT for Internet access, the 

outside global address is the destination host on the Internet. The outside global address in 

this exhibit is the web server. 192.168.1.2 is the inside local address of the host computer. 

192.168.1.1 is the router’s interface address used to communicate with inside local hosts 

during the NAT process. 179.43.44.1 is the inside global address for the NAT process.

 5.  A.  The command 

show ip nat translations will allow you to view the active NAT 

translations on the router. The command 

show nat translations is incorrect. The 

command 

debug ip nat translations will turn on debugging for NAT. The command 

show translations nat is incorrect.

 6.  D.  The command 

show ip nat statistics will display an overview of the number 

of active NAT translations on the router, as well as other statistical information for 

the NAT process. In addition, it will provide you with the current inside and outside 

interfaces. The command 

show ip nat translations will allow you to view the active 

NAT translations on the router. The command 

show ip nat summary is incorrect. The 

command 

show ip nat status is incorrect.

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Chapter 4: IP Services (Domain 4)