The answer is point-to-point, as this is the recommended IS-IS network type on Ethernet interfaces in a large service provider core to improve scalability. By setting the network type to point-to-point, you prevent the election of a designated intermediate system (DIS), which eliminates the need for pseudonode LSPs and reduces LSP flooding overhead across the core. On the Cisco SPCOR / CCNP Service Provider Core 350-501 exam, this concept tests your understanding of how to optimize IS-IS in a dense, scalable SP environment—a common trap is assuming broadcast mode is fine for Ethernet, but that introduces unnecessary DIS election and flooding that degrades performance in large cores. A useful memory tip: think “point-to-point = no DIS drama,” meaning fewer LSPs, less CPU load, and a flatter, more scalable topology.
350-501 Architecture Practice Question
This 350-501 practice question tests your understanding of architecture. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
When deploying IS-IS in a large service provider core, what is the recommended network type on Ethernet interfaces to improve scalability?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
point-to-point
Setting IS-IS network type to point-to-point on Ethernet interfaces prevents the election of a designated intermediate system (DIS) and reduces LSP flooding overhead, improving scalability. Other options are less effective or incorrect.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
loopback
Why it's wrong here
Loopback is not used for point-to-point links.
✓
point-to-point
Why this is correct
Point-to-point avoids DIS election and simplifies flooding, enhancing scalability.
Point-to-multipoint is not typically used on Ethernet interfaces.
✗
non-broadcast
Why it's wrong here
Non-broadcast is used for Frame Relay or ATM, not Ethernet.
✗
broadcast
Why it's wrong here
Broadcast type requires DIS election and more LSP flooding, reducing scalability.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-501 subnetting questions on CIDR, address ranges, and subnet selection.
Architecture — This question tests Architecture — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: point-to-point — Setting IS-IS network type to point-to-point on Ethernet interfaces prevents the election of a designated intermediate system (DIS) and reduces LSP flooding overhead, improving scalability. Other options are less effective or incorrect.
What should I do if I get this 350-501 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-501 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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