Which two IP pool types are useful for carrier-grade NAT deployments? (Choose two.)

Which two IP pool types are useful for carrier-grade NAT deployments? (Choose two.)

A. Port block allocation

B. Fixed port range

C. One-to-one

D. Overload

View Answer

Answer: A,B

Explanation:

The two IP pool types that are useful for carrier-grade NAT (CGNAT) deployments are:

A. Port block allocation

B. Fixed port range

A. Port block allocation: In this method, a range of ports is allocated to each internal IP address. This allows multiple internal devices to share the same public IP address but use different port ranges, enabling more efficient use of IP addresses.

B. Fixed port range: This method allocates a fixed range of ports to each internal IP address. It is similar to port block allocation but restricts the port range to a fixed set of ports for each internal IP address, which can be useful for certain applications or scenarios.

Both port block allocation and fixed port range allocation are commonly used in CGNAT deployments to manage the mapping of internal private IP addresses to public IP addresses and ports, allowing for efficient use of limited IPv4 addresses.