M6(NAT for IPv4) Flashcards
A side effect of NAT is that it hides the inside local IP Address of a host from the outside network
True
With NAT overload, each inside local IP Address is translated to a unique inside global IP Address no a one-for-one basis.
False
The use of NAT makes end-to-end traceability between source and destination easier.
False
Tunneling protocols such as IPsec do not work well through NAT.
True
Which two statement accurately describe an advtanage or an disadvantage when deplying NAT for IPv4 in a network? (Choose two.)
NAT improves packet handling.
NAT adds authentication capability to IPv4.
NAT will impact negatively on switch performance.
NAT causes routing tables to include more information.
NAT provides a solution to slow down the IPv4 address depletion.
NAT introduces problem for some applications that require end-to-end connectivitiy.
(NAT provides a solution to slow down the IPv4 address depletion.) and (NAT introduces problems for some applications that require end-to-end connectivity.)
A network adminstrator wants to examine the active NAT translation on a border router. Which command would perform the task?
Router# show ip nat translations
Router# show ip nat statistics
Router# clear ip nat translations
Router# debug ip nat translations
Router# show ip nat translations
What are two tasks to perform when configuring static NAT? (Choose two.)
Configure a NAT pool
Creating a mapping between the inside local and inside global addresses.
Identify the participating interfaces as inside or outside interfaces.
Define the inside global address on the server.
Define the outside global address.
(Create a mapping between the inside local and inside global addresses.) and (Identify the participating interfaces as inside or outside interfaces.)
What is a disadvantage of NAT?
There is no end-to-end addressing.
The router does not need to alter the checksum of the IPv4 packets.
The internal hosts have to use a single public IPv4 address for external communication.
The costs of readdressing hosts can be significant for a publicly addressed network.
There is no end-to-end addressing.
What is one advantage of using NAT at the edge of the network?
NAT enables end-to-end IPv4 traceability, making troubleshooting easier.
Performance is significantly increased because the router does not have to perform as many route lookups.
Dynamic NAT allows devices from outside the local network to easily initiate TCP connections to inside hosts.
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.
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 benefit does NAT64 provide?
It allows sites to use private IPv6 addresses and translates them to global IPv6 addresses.
It allows sites to connect multiple IPv4 hosts to the Internet via the use of a single public IPv4 address.
It allows sites to connect IPv6 hosts to an IPv4 network by translating the IPv6 addresses to IPv4 addresses.
It allows sites to use private IPv4 addresses, and thus hides the internal addressing structure from hosts on public IPv4 networks.
It allows sites to connect IPv6 hosts to an IPv4 network by translating the IPv6 addresses to IPv4 addresses.
What address translation is performed by static NAT?
An inside local address is translated to a specified outside global address.
An inside local address is translated to a specified outside local address.
An outside local address is translated to a specified outside global address.
An inside local address is translated to a specified inside global address.
Using NAT terminology, what is the address of the source host on a private network as seen from inside the network?
Inside local
Inside global
Outside global
Outside local
Inside Local
Which statement accurately describes dynamic NAT?
It always maps a private IP address to a public IP address.
It provides an automated mapping of inside local to inside global IP addresses.
It provides a mapping of internal host names to IP addresses.
It dynamically provides IP addressing to internal hosts.
It provides an automated mapping of inside local to inside global IP addresses.
Why is NAT not needed in IPv6?
Because IPv6 has integrated security, there is no need to hide the IPv6 addresses of internal networks.
The problems that are induced by NAT applications are solved because the IPv6 header improves packet handling by intermediate routers.
The end-to-end connectivity problems that are caused by NAT are solved because the number of routes increases with the number of nodes that are connected to the Internet.
Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.
A company designs its network so that the PCs in the internal network are assigned IP addresses from DHCP servers, and the packets that are sent to the Internet are translated through a NAT-enabled router. 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?
Static NAT
Dynamic NAT
PAT
ARP
Dynamic NAT
