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Cisco Certified Network Associate (CCNA) · Cisco
Select 2 answers.
This question asks for 2 answers, but our data marks only 1. Compare with the community discussion below for the full answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
This one is difficult based on their wording. Most of us agree that private IPv4 enables us to conserve global address space. RFC 1918 states as much if you read it. So D is one of the answers beyond a doubt. A and E are good contenders for the 2nd option. Answer A uses the word "enable", which would not necessarily be a "reason" to use to IPv4 private addresses over other options. You could use IPv6 to "enable" intra-enterprise communication. E states that it would be good for managing routing overhead. There are a lot of unspecified details here because IPv4 private addresses are not used to "manage" routing overhead either. Does it imply that a router that uses public IPs would have to have a routing table using BGP (which at the time of this comment has around 1 million route entries in the table). I am split between A & E, but would probably pick E if I was forced to chose one.
A. To enable intra-enterprise communication: Private IP spaces allow devices within an enterprise to communicate with one another without the need to have globally unique IP addresses. This makes it easier to manage the internal network, and reduces the risk of IP address conflicts. B. To implement Network Address Translation (NAT): NAT allows devices on a private IP network to communicate with devices on a public IP network. It allows a device on a private network to use a single unique public IP address to connect to the internet or other public IP networks.
A. To enable intra-enterprise communication: Private IP spaces allow devices within an enterprise to communicate with one another without the need to have globally unique IP addresses. This makes it easier to manage the internal network, and reduces the risk of IP address conflicts. B. To implement Network Address Translation (NAT): NAT allows devices on a private IP network to communicate with devices on a public IP network. It allows a device on a private network to use a single unique public IP address to connect to the internet or other public IP networks. Using private IP space in conjunction with NAT allows organization to keep their internal network private, while still providing access to the internet or other public IP network. It conserve global address space as it is not needed to use globally unique IP addresses for all internal devices.