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CompTIA N10-009 Exam - Topic 1 Question 1 Discussion

Actual exam question for CompTIA's N10-009 exam

Question #: 1
Topic #: 1

[All N10-009 Questions]

Which of the following most likely requires the use of subinterfaces?

AA router with only one available LAN port

BA firewall performing deep packet inspection

CA hub utilizing jumbo frames

DA switch using Spanning Tree Protocol

Show Suggested Answer

Suggested Answer: A

Introduction to Subinterfaces:

Subinterfaces are logical interfaces created on a single physical interface. They are used to enable a router to support multiple networks on a single physical interface.

Use Case for Subinterfaces:

Subinterfaces are commonly used in scenarios where VLANs are implemented. A router with a single physical LAN port can be configured with multiple subinterfaces, each associated with a different VLAN.

This setup allows the router to route traffic between different VLANs.

Example Configuration:

Consider a router with a single physical interface GigabitEthernet0/0 and two VLANs, 10 and 20.

interface GigabitEthernet0/0.10

encapsulation dot1Q 10

ip address 192.168.10.1 255.255.255.0

!

interface GigabitEthernet0/0.20

encapsulation dot1Q 20

ip address 192.168.20.1 255.255.255.0

The encapsulation dot1Q command specifies the VLAN ID.

Explanation of the Options:

A . A router with only one available LAN port: This is correct. Subinterfaces allow a single physical interface to manage multiple networks, making it essential for routers with limited physical interfaces.

B . A firewall performing deep packet inspection: Firewalls can use subinterfaces, but it is not a requirement for deep packet inspection.

C . A hub utilizing jumbo frames: Hubs do not use subinterfaces as they operate at Layer 1 and do not manage IP addressing.

D . A switch using Spanning Tree Protocol: STP is a protocol for preventing loops in a network and does not require subinterfaces.

Conclusion:

Subinterfaces provide a practical solution for routing between multiple VLANs on a router with limited physical interfaces. They allow network administrators to optimize the use of available hardware resources efficiently.

CompTIA Network+ guide detailing VLAN configurations and the use of subinterfaces (see page Ref 9Basic Configuration Commands).

by Holley at Jul 16, 2024, 04:22 AM

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Cammy

7 months ago

Not so sure about B, I thought firewalls don't need subinterfaces.

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Sabina

8 months ago

A is the clear choice here, no doubt about it!

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Leonora

8 months ago

Wait, are subinterfaces really needed for just one LAN port?

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Nikita

8 months ago

I think B could also use subinterfaces for inspection.

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Lorita

8 months ago

Definitely A, subinterfaces are key for routing.

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Bette

9 months ago

I’m a bit confused. I thought subinterfaces were mostly for routers, but I can't recall if they apply to switches or hubs at all.

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Sunshine

9 months ago

I feel like subinterfaces are more about managing traffic rather than just having one port. Could it be something like option B?

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Kanisha

9 months ago

I remember practicing a question about VLANs and subinterfaces. I think they help with routing between different networks, so maybe it's related to option A?

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Cyril

9 months ago

I think subinterfaces are mainly used for routers, but I'm not sure if it's just for those with multiple LAN ports.

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Bea

9 months ago

The key here is understanding the purpose and functionality of subinterfaces. I believe option B is the correct answer, as a firewall doing deep packet inspection would benefit from the use of subinterfaces.

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Elke

9 months ago

I'm pretty confident that the answer is B. A firewall performing deep packet inspection would need to use subinterfaces to separate and analyze the different types of network traffic.

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Stefany

9 months ago

Okay, I think I've got this. Deep packet inspection by a firewall would likely require the use of subinterfaces to handle the different traffic flows.

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Celestina

9 months ago

Hmm, I'm a bit confused about the use of subinterfaces. I'll need to review that topic before attempting this question.

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Jose

9 months ago

This question seems straightforward, but I want to make sure I understand the concepts correctly before answering.

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Ena

9 months ago

I've got this! The beginning of time for UNIX is known as the "epoch." It's a common term used in computer science and programming to refer to a standardized starting point for time measurements. I'm confident that's the right answer.

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Viki

9 months ago

This question seems straightforward. I think the key is to focus on the Azure AD DS managed domain and how that relates to the Windows Virtual Desktop host pool.

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Dannette

9 months ago

Hmm, I'm a bit unsure about the differences between Expressway Core and Expressway Edge. Let me think this through carefully.

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Alana

2 years ago

Haha, C) A hub utilizing jumbo frames? That's a good one! Hubs don't even use subinterfaces, they're like the dinosaurs of networking.

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Susana

2 years ago

Haha, C) A hub utilizing jumbo frames? That's a good one! Hubs don't even use subinterfaces, they're like the dinosaurs of networking.

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Zona

2 years ago

D) A switch using Spanning Tree Protocol

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Paris

2 years ago

B) A firewall performing deep packet inspection

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Sharen

2 years ago

A) A router with only one available LAN port

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Charlena

2 years ago

I'm going with A) A router with only one available LAN port. Subinterfaces would allow that router to create multiple logical interfaces on the single physical port, expanding its connectivity options.

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Yaeko

2 years ago

B) A firewall performing deep packet inspection is my pick. Subinterfaces can help the firewall segregate and inspect traffic more efficiently across different logical interfaces.

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Juliann

2 years ago

I think subinterfaces are essential for deep packet inspection on firewalls.

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Judy

2 years ago

I agree, subinterfaces can definitely help with traffic segregation.

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Martina

2 years ago

I think D) A switch using Spanning Tree Protocol might also need subinterfaces for VLAN segmentation.

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Aliza

2 years ago

I'm not sure, but I think A) A router with only one available LAN port could also require subinterfaces.

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Stephania

2 years ago

D) A switch using Spanning Tree Protocol seems like the correct answer here. Subinterfaces are often used to manage and configure multiple logical interfaces on a single physical interface, which is a common requirement for switches running STP.

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Elenora

2 years ago

That makes sense, subinterfaces help manage multiple logical interfaces on a single physical interface.

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Elenora

2 years ago

I agree, subinterfaces are commonly used with switches running STP.

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Franchesca

2 years ago

I agree with Dean, subinterfaces are commonly used in firewalls for different security zones.

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Dean

2 years ago

I think the answer is B) A firewall performing deep packet inspection.

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