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Which two statements accurately describe an advantage or a disadvantage when deploying NAT for IPv4 in a network? (Choose two.)

  • NAT will impact negatively on switch performance.
  • NAT causes routing tables to include more information.
  • NAT improves packet handling.
  • NAT adds authentication capability to IPv4.
  • NAT provides a solution to slow down the IPv4 address depletion.
  • NAT introduces problems for some applications that require end-to-end connectivity.
Explanation & Hint:

When deploying Network Address Translation (NAT) for IPv4 in a network, the following two statements accurately describe an advantage or a disadvantage:

  1. NAT provides a solution to slow down the IPv4 address depletion. NAT allows multiple devices on a private network to share a single public IPv4 address for accessing external networks, such as the internet. This helps to mitigate the problem of IPv4 address exhaustion by reducing the number of public addresses that an organization needs.
  2. NAT introduces problems for some applications that require end-to-end connectivity. Some applications, particularly those that require the initiation of connections from the external network to the internal network or use IP address information embedded within the application layer data, can have issues operating over NAT. This is because NAT modifies the IP address information in packets, which can disrupt the direct communication path that these applications rely on.

The other statements are either not advantages/disadvantages of NAT or are incorrect:

  • NAT will impact negatively on switch performance. NAT is typically performed by routers or firewalls, not switches. It does not directly affect switch performance.
  • NAT causes routing tables to include more information. NAT does not directly affect the size of routing tables. Routing tables are concerned with the destination IP addresses and do not need to store information about translated addresses.
  • NAT improves packet handling. While NAT can help manage the IP address space, it does not inherently improve how packets are handled beyond the address translation function.
  • NAT adds authentication capability to IPv4. NAT does not provide authentication capabilities; it merely translates IP addresses from private to public and vice versa. Authentication is a separate function that is not provided by NAT itself.

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