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Objective 1.6

200-301

Configure and verify IPv4 addressing and subnetting.

Objective 1.6 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

Shown solved, with the whole explanation open: this is what every question here carries.

1-6Network Fundamentals

PC1 carries 192.168.5.65/28 with a default gateway of 192.168.5.62. It reaches other hosts on its own segment but no remote network. What is wrong?

A /28 mask leaves too few hosts for this segmentA /28 gives 14 usable addresses, which is a capacity question and unrelated to the failed default route.
The host address is the subnet's broadcast address192.168.5.79 would be the broadcast for this block. The address in use is the first usable one.
The gateway and host are using different subnet masksBoth ends carry 255.255.255.240 here. Mismatched masks would instead show as asymmetric reachability.
The gateway address is outside the host's own subnetCorrect · your answerCorrect. 192.168.5.62 falls outside the 65 to 78 range that PC1's mask defines.

Correct.

Checked against cisco.com, August 2026

Concept

A station reaches its first hop by resolving it directly on the wire, so that first hop has to fall inside the range the station's own mask defines. If the mask places the two in different ranges, the station never resolves the router and every off-link packet dies on the local segment.

Why D

With a /28 mask, 192.168.5.65 sits in the block running from 65 to 78. The address 192.168.5.62 belongs to the preceding block, 33 to 62, so PC1 treats it as a remote destination, has no way to reach it, and never gets a frame to a router.

Source

…netE: 192.168.5.32/27 host address range 33 to 62 netA: 192.168.5.64/28 host address range 65 to 78…

Cisco: Configure IP Addresses and Unique Subnets, checked August 2026
#subnetting#default-gateway#vlsm

Now you: objective 1.6 questions

No account needed. The explanation opens when you answer.

Sample question 1 of 3

1-6Network Fundamentals

An engineer numbers a router-to-router link and sees this.

R1(config)#interface gigabitEthernet 0/1R1(config-if)#ip address 192.168.1.0 255.255.255.254% Warning: use /31 mask on non point-to-point interface cautiously

What does the /31 mask give the link?

Sample question 2 of 3

1-6Network Fundamentals

A VLSM plan allocates 192.168.5.80/29 to a segment that has to hold seven hosts. What is wrong with the allocation?

Sample question 3 of 3

1-6Network Fundamentals

An ISP hands a customer a single summarized prefix rather than many small blocks. Which design goal of CIDR does that serve?

That’s 3 of the full CCNA bank.

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Read the sources

These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.

More objectives in Network Fundamentals