Examkin

Question

Difficulty: EasyNAT and PAT Implementation

Match each Network Address Translation (NAT) implementation type on the left with its corresponding address mapping characteristic on the right.

  • Static NATMaps a single private IPv4 address to a single public IPv4 address in a permanent one-to-one configuration.
  • Dynamic NATMaps internal private IPv4 addresses to an available pool of public IPv4 addresses on a dynamic, first-come basis.
  • Port Address Translation (PAT)Maps multiple internal private IPv4 addresses to a single public IPv4 address by utilizing unique source port numbers.

Answer

Static NAT matches permanent one-to-one mapping; Dynamic NAT matches translation using a dynamic pool of public IP addresses; Port Address Translation (PAT) matches translation of multiple private IP addresses to a single public IP address using unique port numbers.
Static NAT creates a permanent one-to-one mapping between a single private IP and a single public IP address. Dynamic NAT uses a pool of public IP addresses assigned dynamically to internal hosts on demand. Port Address Translation (PAT) multiplexes multiple private IP addresses onto a single public IP address using unique Layer 4 source port numbers.

Step-by-Step Solution

1
Identify the mapping behavior of Static NAT.
Static NAT establishes a fixed, persistent one-to-one mapping between one private IP address and one public IP address.
Static NAT is required when an internal host (such as an enterprise web or mail server) must maintain a consistent external IP address for inbound connectivity.
2
Identify the mapping behavior of Dynamic NAT.
Dynamic NAT assigns an available public IP address from a configured pool to an internal host dynamically for the duration of a session.
Dynamic NAT allows multiple devices to access the internet as long as sufficient public IP addresses exist in the pool for active sessions.
3
Identify the mapping behavior of Port Address Translation (PAT).
PAT allows many private host IPs to share one public IP address by assigning unique source port numbers to distinguish individual sessions.
PAT conserves IPv4 public address space by leveraging TCP/UDP source ports at Layer 4 to multiplex traffic over a single public address.

Key Concept

NAT and PAT Implementation Types
Estimated Time:1m 0s
Rate this question

Topics

NAT and PAT Implementation

More questions from this topic