Describe private IPv4 addressing.

Objective 1.7 sits in Network Fundamentals, which carries 20% of the CCNA exam. The questions below are original, written from the official objective title above, and each explanation cites the Cisco page it rests on.

Objective title verbatim from the official objectives. Cisco exam page ↗

A worked example

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1-7Network FundamentalsModerate

A provider edge router receives a routing advertisement for 10.0.0.0/8 across an inter-enterprise link. What is the expected handling?

Accept it and translate the prefix at the boundaryTranslation acts on packets at the enterprise edge, not on routing updates arriving at a provider.

Filter the advertisement and raise no protocol errorCorrect · your answerCorrect. The prefix is dropped and the session carries on normally.

Reset the peering and log a routing protocol errorTearing down the session treats the advertisement as a violation, and the rejection is explicitly not one.

Accept the advertisement and pass it to other peersPassing it on puts an ambiguous prefix into the global table, which is the outcome the reservation exists to avoid.

Correct.

Checked against datatracker.ietf.org, August 2026

Concept

An address block that carries no global meaning cannot be reachable outside the boundary that assigns it. Reachability information for such a block therefore has no business on a link between two administrations, and discarding it is ordinary operation rather than a fault to be signalled.

Why B

The reserved blocks are unique only inside the enterprise using them, so RFC 1918 expects providers to configure their routers to reject routing information about private networks. It adds that the rejection is not to be treated as a routing protocol error, so the session stays up and nothing is reported to the neighbour.

Source

Routers in networks not using private address space, especially those of Internet service providers, are expected to be configured to reject (filter out) routing information about private networks. If such a router receives such information the rejection shall not be treated as a routing protocol error.

IETF RFC 1918: Address Allocation for Private Internets, checked August 2026

#rfc1918#private-addressing#route-filtering

Now you: objective 1.7 questions

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Sample question 1 of 2

1-7Network FundamentalsEasy

A new branch office LAN will use addressing that is never routed on the public Internet. Which range does RFC 1918 reserve for private use inside such a network?

Sample question 2 of 2

1-7Network FundamentalsModerate

A branch uses 10.0.0.0/8 addresses internally and still reaches the internet. Which mechanism connects a private realm to globally registered addresses?

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A worked example

Now you: objective 1.7 questions

Read the sources

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