Network
Address
Translation
Chapter
11
100
inside global addresses
What is the group of public IPv4 addresses used on a NAT-enabled router known as?
100
When NAT is employed in a small office, which address type is typically used for hosts on the local LAN?
private IP addresses
100
Which type of NAT maps a single inside local address to a single inside global address?
static
100
Which command will show you the summary of the NAT configuration?
show ip nat statistics
100
Which NAT term refers to the IP address of your inside host as it appears to the outside network?
inside local IP address
200
What does NAT stand for?
Network Address Translation
200
Your workstation ip address is 192.168.0.221. Your edge firewall public IP is 64.22.226.159. My edge firewall public IP is 8.8.8.8. My web server internal IP is 10.10.10.100. What IP does my edge firewall see when you open a connection to the web server from your workstation?
64.22.226.159
200
Several key servers in an organization must be directly accessible from the Internet. What addressing policy should be implemented for these servers?
Assign static internal addresses and public external addresses to each of the servers
200
What does PAT stand for?
Port Address Translation
200
What command will create a dynamic pool named HAMSAUCE that will provide you with 30 global addresses?
ip nat pool HAMSAUCE 171.16.10.65 171.16.10.94 net 255.255.255.224
300
When running NAT, what is the purpose of address overloading?
allow multiple inside addresses to share a single global address
300
Which version of NAT allows many hosts inside a private network to simultaneously use a single inside global address for connecting to the Internet?
PAT
300
What type of NAT enables the router to populate the translation table from a pool of unique public addresses, as the PCs send packets through the router to the Internet?
Dynamic NAT
300
Which command will clear all the translations active on your router?
clear ip nat translations
300
What is a disadvantage of NAT?
There is no end-to-end addressing.
400
Typically, which network device would be used to perform NAT for a corporate environment?
router per the book
400
Which of the following are disadvantages of using NAT? (Choose all that apply) A) Translation introduces switching path delays. B) Conserves legally registered addresses. C) Causes loss of end-to-end IP traceability. D) Increases flexibility when connecting to the Internet. E) Certain applications may need more configuration to function or not function at all. F) Reduces address overlap occurrence.
A) Translation introduces switching path delays. C) Causes loss of end-to-end IP traceability. E) Certain applications may need more configuration to function or not function at all.
400
Pat Address Translation is also termed what?
NAT with overload
400
What is a characteristic of unique local addresses?
They allow sites to be combined without creating any address conflicts.
400
Which statement accurately describes dynamic NAT? A) It always maps a private IP address to a public IP address. B) It provides an automated mapping of inside local to inside global IP addresses. C) It provides a mapping of internal host names to IP addresses. D) It dynamically provides IP addressing to internal hosts.
B) It provides an automated mapping of inside local to inside global IP addresses.
500
What is a socket?
An IP address and Port # combination
500
When dynamic NAT without overloading is being used, what happens if 15 users attempt to access a public server on the Internet when 20 addresses are available in the NAT pool?
Nothing out of the ordinary. Addresses are translated as requested.
500
Which command will allow you to see real-time translations on your router?
debug ip nat
500
Which of the following would be a good starting point for troubleshooting if your router is not translating? A. Reboot. B. Call Cisco. C. Check your interfaces for the correct configuration. D. Run the debug all command.
C. Check your interfaces for the correct configuration.
500
When dynamic NAT without overloading is being used, what happens if 20 users attempt to access a public server on the Internet when only 15 addresses are available in the NAT pool?
The request fails. 20 > 15
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