100-150 Question 62
Select 4A company is setting up a new network and needs to assign IP addresses to its devices. The IT administrator decides to use private IP addresses for internal communication but is unsure about their difference compared to public IP addresses. Which of the following statements accurately describe private and public IP addresses?
- A
Private IP addresses are routable on the public internet.
- B
Public IP addresses are unique across the entire internet.
- C
Private IP addresses can be used within an organization without requiring coordination with an external authority.
- D
Public IP addresses are assigned by organizations such as IANA or regional authorities like ARIN.
- E
Private IP addresses require Network Address Translation (NAT) to communicate with devices on the public internet.
Show answer and explanation
Correct answers: B, C, D, E
Explanation
Private IP addresses, defined by RFC 1918, are reserved for internal network use and are not routable on the public internet. Public IP addresses are globally unique and assigned by regulatory authorities to ensure proper connectivity across the internet. NAT is often used to enable private IP addresses to communicate with public networks. Understanding these differences helps in designing effective and secure network architectures.
- A. Incorrect.
Private IP addresses are not routable on the public internet. They are designed for internal network use only.
- B. Correct.
Public IP addresses must be unique across the internet to ensure proper communication between devices globally.
- C. Correct.
Private IP addresses are used internally within organizations and do not require external coordination or registration.
- D. Correct.
Public IP addresses are regulated and assigned by organizations such as IANA (Internet Assigned Numbers Authority) or its regional registries like ARIN.
- E. Correct.
Private IP addresses need NAT to translate them into public IP addresses when communicating with devices on the public internet.