Group Address Translation Types for Private to Public Mapping
Question
Which two address translation types can map a group of private addresses to a smaller group of public addresses? (Choose two.)
Answers
Explanations
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A. B. C. D. E.CD.
The correct answers are: A. static NAT and D. PAT.
Address translation is the process of modifying an IP address or port number in a packet header while it travels through a network. It is commonly used to connect private networks to the public Internet by allowing multiple hosts with private IP addresses to share a single public IP address.
There are several types of address translation, including:
A. Static NAT: A one-to-one mapping of a private IP address to a public IP address. This type of address translation is used when a host or a group of hosts need to be accessible from the Internet using a fixed public IP address.
B. Dynamic NAT: A mapping of a private IP address to a public IP address from a pool of available public addresses. This type of address translation is used when a limited number of public IP addresses are available and need to be shared among multiple hosts.
C. Dynamic NAT with overloading (or Port Address Translation - PAT): A type of dynamic NAT where multiple private IP addresses are translated to a single public IP address by modifying the source port number of the outgoing packets. This allows many hosts to share a single public IP address.
D. PAT (or NAT overload): A one-to-many mapping of a private IP address and port number to a public IP address and port number. This type of address translation is similar to dynamic NAT with overloading, but it maps both the private IP address and port number to a single public IP address and port number.
E. VAT (or Virtual Address Translation): A technique that allows a single IP address to represent multiple IP addresses on a network. This is accomplished by using a virtual IP address that maps to multiple real IP addresses.
Out of these types, Static NAT and PAT can map a group of private addresses to a smaller group of public addresses. Static NAT maps individual private IP addresses to individual public IP addresses, whereas PAT maps a range of private IP addresses to a single public IP address. Therefore, options A and D are correct.
