1.6 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.
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?
The 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 this answer
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.
- Correct. 192.168.5.62 falls outside the 65 to 78 range that PC1's mask defines.
- B192.168.5.79 would be the broadcast for this block. The address in use is the first usable one.
- CA /28 gives 14 usable addresses, which is a capacity question and unrelated to the failed default route.
- DBoth ends carry 255.255.255.240 here. Mismatched masks would instead show as asymmetric reachability.
Now you: objective 1.6 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 2
An engineer numbers a router-to-router link and sees this.
R1(config)#interface gigabitEthernet 0/1
R1(config-if)#ip address 192.168.1.0 255.255.255.254
% Warning: use /31 mask on non point-to-point interface cautiouslyWhat does the /31 mask give the link?
Sample question 2 of 2
A VLSM plan allocates 192.168.5.80/29 to a segment that has to hold seven hosts. What is wrong with the allocation?
That’s 2 of the full CCNA bank.
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Continue practicingRead 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.