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CompTIA Certification
N10-009 Exam
CompTIA.N10-009.v2026-04-15.q384 Dumps

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Question 256

A network engineer adds a tunnel for a new branch network. Which of the following ensures that all data is encrypted inside the tunnel?

A.ESP
B.SSH
C.GRE
D.IKE

Correct Answer: A

ESP (Encapsulating Security Payload) is an IPsec protocol that provides encryption, integrity, and authentication for data inside a VPN tunnel. It ensures that all tunneled traffic is encrypted.
B . SSH secures remote terminal sessions, not site-to-site VPN tunnels.
C . GRE (Generic Routing Encapsulation) provides encapsulation but does not encrypt data.
D . IKE (Internet Key Exchange) negotiates keys and establishes the IPsec tunnel but does not encrypt the payload itself.
Reference (CompTIA Network+ N10-009):
Domain: Network Security - VPN protocols, IPsec (AH vs. ESP), encryption in transit.

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Question 257

A network technician is troubleshooting a web application's poor performance. The office has two internet links that share the traffic load. Which of the following tools should the technician use to determine which link is being used for the web application?

A.netstat
B.nslookup
C.ping
D.tracert

Correct Answer: D

Understanding Tracert:
Traceroute Tool: tracert (Windows) or traceroute (Linux) is a network diagnostic tool used to trace the path that packets take from a source to a destination. It lists all the intermediate routers the packets traverse.
Determining Traffic Path:
Path Identification: By running tracert to the web application's destination IP address, the technician can identify which route the traffic is taking and thereby determine which internet link is being used.
Load Balancing Insight: If the office uses load balancing for its internet links, tracert can help verify which link is currently handling the traffic for the web application.
Comparison with Other Tools:
netstat: Displays network connections, routing tables, interface statistics, and more, but does not trace the path of packets.
nslookup: Used for querying DNS to obtain domain name or IP address mapping, not for tracing packet routes.
ping: Tests connectivity and measures round-trip time but does not provide path information.
Implementation:
Open a command prompt or terminal.
Execute tracert [destination IP] to trace the route.
Analyze the output to determine the path and the link being used.
Reference:
CompTIA Network+ study materials on network troubleshooting and diagnostic tools.

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Question 258

An IT department asks anewly hired employeeto use apersonal laptopuntil the company can provide one.
Which of the followingpoliciesismost applicableto this situation?

A.IAM
B.BYOD
C.DLP
D.AUP

Correct Answer: B

Comprehensive and Detailed Explanation:
BYOD (Bring Your Own Device)policies define rules forusing personal deviceson the company network.
Since the new employee is using apersonal laptop, this policy applies.
Breakdown of Options:
* A. IAM (Identity and Access Management)- Governsuser permissions,not device policies.
* B. BYOD (Bring Your Own Device)-#Correct answer.Coversusing personal devicesfor work.
* C. DLP (Data Loss Prevention)- Focuses onpreventing sensitive data leaks,not device usage policies.
* D. AUP (Acceptable Use Policy)- Coversinternet and system usage, butnot personal device rules.

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Question 259

An organization requires the ability to send encrypted email messages to a partner from an email server that is hosted on premises. The organization prefers to use the standard default ports when creating firewall rules. Which of the following ports should be open to satisfy the requirements?

A.110
B.143
C.587
D.636

Correct Answer: C

Port 587 is the standard default port for sending email (SMTP) with TLS encryption, which is used to secure email transmissions between mail servers or between clients and mail servers. Allowing traffic over port 587 enables secure email sending while maintaining standard protocol usage. (Reference: CompTIA Network+ Study Guide, Chapter on Ports and Protocols)

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Question 260

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

A.A router with only one available LAN port
B.A firewall performing deep packet inspection
C.A hub utilizing jumbo frames
D.A switch using Spanning Tree Protocol

Correct 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.
References:
* CompTIA Network+ guide detailing VLAN configurations and the use of subinterfaces (see page Ref
9fBasic Configuration Commands).

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