I think the answer B should be more specific like "To conserve IPv4 Public Addresses" - otherwise you cant conserve IPv4 addresses by using IPv4 addresses.
it´s B & D
A. Comply with PCI regulations: While PCI regulations require that organizations protect their cardholder data, they do not specifically require the use of private IPv4 addressing. incorrect
B.Conserve IPv4 address: Private IPv4 addressing can help conserve public IPv4 addresses, which are becoming increasingly scarce. correct
C. Reduce the size of the forwarding table on network routers: This is not a direct benefit of using private IPv4 addressing, as private IP addresses are typically not included in forwarding tables on network routers. incorrect
D. Reduce the risk of a network security breach: Private IPv4 addressing can also help reduce the risk of network security breaches. correct
E. Comply with local law: Local laws may require certain security measures, but they do not specifically require the use of private IPv4 addressing. incorrect
For me is "C", look at what RFC1918- IP-Public said
" One challenge is a concern within the community that globally unique
address space will be exhausted. A separate and far more pressing
concern is that the amount of routing overhead will grow beyond the
capabilities of Internet Service Providers. Efforts are in progress
within the community to find long term solutions to both of these
problems. Meanwhile it is necessary to revisit address allocation
procedures, and their impact on the Internet routing system."
Referens: https://datatracker.ietf.org/doc/html/rfc1918
I'm a little confused, per The CCNA Official Cert Guide Vol1 (page 278):
■Avoiding/Delaying IPv4 Address Exhaustion: To delay the day in which all public IPv4 addresses were assigned to organizations as public addresses, RFC 1918 calls for the use
of NAT along with private networks for the addresses internal to an organization.
■ Reducing Internet Routers’ Routing Table Size: Using private networks also helps reduce
the size of the IP routing tables in Internet routers. For instance, routers in the Internet do
not need routes for the private IP networks used inside organizations (in fact, ISPs filter
those routes)
Question is asking the benefits of using private ipv4 on OUR NETWORK . From this perspective it doesn't matter to us whether the size of routing table of ISP or other public routers are less or large.
We need to assess the benefits it provides to us. And on that note security is one good reason as our networks can't be accessed from internet unless NAT is in use.
And it does save the ipv4 address exhaustion.
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