200-301 · Question #945
Which concern is addressed with the use of private IPv4 addressing?
The correct answer is D. Lack of available publicly routable unique IPv4 address. Private IPv4 addressing was introduced to conserve the limited supply of publicly routable IPv4 addresses by allowing internal networks to use non-globally unique addresses.
Question
Options
- ALack of routing protocol support for CIDR and VLSM
- BLack of security protocols at the network perimeter
- CLack of available TCP/UDP ports per IPv5 address
- DLack of available publicly routable unique IPv4 address
How the community answered
(38 responses)- B5% (2)
- C3% (1)
- D92% (35)
Why each option
Private IPv4 addressing was introduced to conserve the limited supply of publicly routable IPv4 addresses by allowing internal networks to use non-globally unique addresses.
CIDR (Classless Inter-Domain Routing) and VLSM (Variable Length Subnet Masks) were actually developed to help mitigate IPv4 address exhaustion, and routing protocols widely support them.
Private addressing itself does not directly address the lack of security protocols; security is handled by firewalls, VPNs, and other security mechanisms.
IPv4 addresses do not have a concept of 'ports per address' in the way implied; TCP/UDP ports are 16-bit values (0-65535) available for any IPv4 address, and IPv5 is not a widely adopted standard.
The primary concern addressed by private IPv4 addressing, as defined in RFC 1918, is the exhaustion of the publicly routable IPv4 address space. By using private addresses internally, organizations can conserve public IPv4 addresses, and these private addresses are then translated to public addresses via Network Address Translation (NAT) when communicating with the internet.
Concept tested: Purpose of private IPv4 addresses
Source: https://www.rfc-editor.org/rfc/rfc1918
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