Review NAT

What is a security feature of using NAT on a network?

Allows internal IP addresses to be concealed from external users.

What address translation is performed by static NAT?

An inside local address is translated to a specified inside global address

Why is NAT not needed in IPv6?

Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.

What is one advantage of using NAT at the edge of the network?

Changing ISPs is simpler because the devices on the inside network do not have to be configured with new addresses when the outside address changes.

What is the first step in the NAT configuration process?

Define inside and outside interfaces.

What type of NAT enables the router to populate the translation table from a pool of unique public addresses, as the PC's send packets through the router to the Internet?

Dynamic NAT

What type of NAT would be most appropriate for the employee workstations of the company?

Dynamic NAT overload using the pool of addresses

What are two task to perform when configuring static NAT?

Identify the participating interfaces as inside or outside interfaces. Create a mapping between the inside local and inside global addresses.

Which type of address is the public IP address of a NAT device?

Inside Global

Using NAT terminology, what is the address of the source host on a private network as seen from inside the network?

Inside Local

Which two types of NAT addresses are used in a Cisco NAT device?

Inside Local and Inside Global.

What benefit does NAT64 provide?

It allows sites to connect IPv6 host to an IPv4 network by translating the IPv6 addresses to IPv4 addresses.

What is the danger of the permit any entry in a NAT access list?

It can lead to overloaded resources on the router.

What is the effect of the overload keyword in a static NAT translation configuration?

It enables port address translation (PAT)

Which statement accurately describes dynamic NAT?

It provides an automated mapping of inside local to inside global IP addresses.

Which technology allows a large number of private IP addresses to be represented by a smaller number of public IP addresses?

NAT

What are two benefits of using NAT?

NAT eliminates the need to re-address all hosts that require external access. NAT protects network security because private networks are not advertised.

Which two statements accurately describe an advantage or a disadvantage when deployed NAT for IPv4 in a network?

NAT introduces problems for some applications that require end-to-end connectivity. NAT provides a solution to slow down the IPv4 address depletion.

Which NAT function can map multiple inside addresses to a single outside address?

PAT

Which version of NAT allows many host inside a private network to simultaneously use a single inside global address for connecting to the Internet?

PAT

A network administrator wants to examine the active NAT translations on a border router. Which command would perform the task?

Router# show ip nat translations

When dynamic NAT without overloading is being used, what happens if seven users attempt to access a public server on the Internet when only six addresses are available in the NAT pool?

The request to the server for the seventh user fails.

What is a disadvantage of NAT?

There is no end-to-end addressing

Under which circumstances should a network administrator implement one-way NAT?

When traffic that originates outside the network must be routed to internal host.

Which NAT type is used to translate a single inside address to a single outside address?

dynamic NAT

Which statement about the inside interface configuration in a NAT deployment is true?

it identifies the location of source addresses for outgoing packets to be translated using access or route maps.

Which command can you enter to display the hits counter for NAT traffic?

show ip nat statistics