N10-009 Exam Dumps - CompTIA Network+ Certification Exam

When two devices on different subnets are unable to communicate, but can communicate with other devices on their own subnet, the issue is most often related torouting. Devices on different subnets require adefault gatewayto route traffic between networks.

If thedefault gateway is incorrectly configured, the device won’t know how to reach other subnets.

Faulty cables (Option B) or duplex mismatches (Option C) would likely cause connectivity issues even within the local subnet, which is not the case here.

VLAN mismatches (Option D) are typically issues with switch port configurations and would likely cause total loss of connectivity, including within the same subnet.

✅So, the most probable andlogical causeis anincorrect default gateway.

Private VLANs (PVLANs)are used tosegment devices on the same subnetand switch so they cannot communicate with each other, while still accessing a shared resource like a router or gateway. This is often used in shared hosting or DMZ environments.

A. ACLs (Access Control Lists)control traffic between networks, not within the same VLAN.

B. Trunkingcarries multiple VLANs between switches but does not isolate devices.

C. Port securitylimits MAC addresses per port but doesn’t isolate communication between ports.

📘Reference:

CompTIA Network+ N10-009 Official Objectives: 3.4 – Compare and contrast access control methods.

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.

Comprehensive and Detailed Explanation:

If aping to 10.0.100.19 is unreachable, themost likely issueis that users areon the wrong subnetand cannot communicate with the server.

Breakdown of Options:

A. The users are on the wrong subnet.✅Correct answer.If users are ona different subnetwithout proper routing,they won't reach the server.

B. The DHCP server renewed the lease.– Wouldchange the client’sIP, but the server’sstatic IP should remain unchanged.

C. The IP address was not reserved.– DHCP reservations matter fordynamic IPs, but RDP serverstypically have static IPs.

D. The hostname was changed.– Would affectDNS resolution, butpinging the IP directly would still work.

In a data center that uses hot aisle/cold aisle ventilation, equipment is typically installed so that cool air enters from the cold aisle (front) and hot air is exhausted to the hot aisle (rear). This configuration maximizes cooling efficiency.

AnSLA (Service Level Agreement)defines performance expectations, includingresponse time, prioritization, and resolution timefor services and support issues. It helps the technician determine which task hashigher priority based on business impact.

A. NDA (Non-Disclosure Agreement)relates to confidentiality, not task prioritization.

B. AUP (Acceptable Use Policy)defines user behavior, not issue handling.

D. MOU (Memorandum of Understanding)outlines informal agreements and doesn't define ticket priorities.

📘Reference:

CompTIA Network+ N10-009 Official Objectives: 4.1 – Compare and contrast common documentation types.

A cold site is a backup facility that provides infrastructure (such as power, cooling, and space) but does not have active IT resources installed. When a disaster occurs, IT teams must bring in and configure all necessary hardware and software before services can resume. This process can take weeks or longer—which matches the scenario described.

•Why not the other options?

•Hot site (A) – A hot site is a fully operational backup facility with up-to-date data and pre-configured hardware, allowing almost instant failover (minutes to hours).

•Warm site (B) – A warm site has pre-installed hardware and some software/configurations, but it requires some setup before becoming fully operational (hours to a few days).

•Active-active approach (D) – This means that multiple sites run simultaneously with load balancing, ensuring no downtime in case of a failure.