Free CompTIA N10-009 Practice Questions 2026 - Page 21
An organization moved itsDNS serversto new IP addresses. After this move, customers are no longer able to access the organization's website. Which of the followingDNS entries should be updated?
A. AAAA
B. CNAME
C. MX
D. NS
Explanation:
An organization moved its DNS servers to new IP addresses, and after this move, customers are no longer able to access the organization’s website. The DNS entry that should be updated to resolve this issue, at 11:25 AM PKT on Thursday, August 21, 2025, is NS (Name Server).
D. NS:
How it works: NS (Name Server) records specify the authoritative DNS servers for a domain. These records point to the servers responsible for resolving the domain’s DNS queries (e.g., translating www.example.com to an IP address). When DNS servers move to new IP addresses, updating the NS records ensures clients and recursive resolvers query the correct new servers.
Why it fits: Customers cannot access the website because the old NS records still point to the previous DNS server IPs, which are no longer valid after the move. Updating the NS records with the new IP addresses of the DNS servers allows the domain’s DNS resolution to function again, enabling access to the website.
Context: This is a critical step after migrating DNS infrastructure, as failure to update NS records disrupts all domain-related services, including the website.
Why Not the Other Options?
A. AAAA:
AAAA records map a hostname to an IPv6 address (e.g., www.example.com to 2001:db8::1). While updating AAAA records might be needed if the website’s server IP changed, the issue stems from the DNS servers’ move, not the website’s IP, making AAAA irrelevant here.
B. CNAME:
CNAME (Canonical Name) records create aliases, pointing one hostname to another (e.g., www to a canonical name). Updating a CNAME might redirect traffic but doesn’t address the DNS server location change affecting all resolutions.
C. MX:
MX (Mail Exchange) records specify mail servers for a domain. They are unrelated to website access, as the issue affects HTTP/HTTPS traffic, not email, making MX updates unnecessary.
Why NS?
The inability to access the website after moving DNS servers indicates that the authoritative name servers’ locations have changed, breaking DNS resolution. Updating the NS records with the new IP addresses of the DNS servers restores the resolution chain, allowing customers to reach the website again.
Implementation Considerations:
Identify the new IP addresses of the DNS servers.
Update the NS records in the domain’s zone file (e.g., ns1.example.com to 192.168.2.10).
Update the registrar’s nameserver records if hosted externally.
Allow time for DNS propagation (e.g., 24-48 hours).
Test website access from multiple locations to confirm resolution.
Reference:
CompTIA Network+ (N10-009) Exam Objectives:
Section 1.5 – "Compare and contrast common network protocols and their functions." This includes understanding DNS record types like NS.
RFC 1035 (Domain Names - Implementation and Specification):
Defines NS records for authoritative servers.
ICANN DNS Management Guides:
Recommend updating NS records after server moves.
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
Explanation:
A network technician is troubleshooting a web application's poor performance in an office with two internet links that share the traffic load. To determine which link is being used for the web application, the technician should use tracert.
D. tracert:
How it works: Tracert (traceroute on Unix-like systems) traces the path packets take from the source to the destination by sending ICMP or UDP packets with increasing TTL (Time to Live) values. It displays the IP addresses of each hop, including the gateway or router handling the initial outbound traffic, revealing which internet link is in use.
Why it fits: the office’s two internet links likely involve a load balancer or routing policy (e.g., equal-cost multi-path routing). Running tracert to the web application’s server (e.g., tracert www.example.com) will show the first hop’s IP address, indicating which link (e.g., ISP1’s gateway at 192.168.1.1 vs. ISP2’s at 192.168.2.1) is handling the traffic. This helps identify if the poor performance correlates with a specific link.
Context: This is a practical tool for diagnosing routing issues in multi-link environments during peak usage times.
Why Not the Other Options?
A. netstat:
Netstat displays active connections, listening ports, and routing table information on the local machine (e.g., netstat -r). While it can show the default gateway, it doesn’t trace the path to the web application or confirm which link is actively used, making it less suitable.
B. nslookup:
Nslookup resolves domain names to IP addresses (e.g., www.example.com to 203.0.113.10). It helps identify the destination IP but provides no insight into which internet link the traffic takes, limiting its usefulness here.
C. ping:
Ping tests reachability and latency to a destination IP by sending ICMP echo requests. While it can measure performance, it doesn’t trace the route or identify which link is used, making it insufficient for this specific task.
Why tracert?
Tracert is the most effective tool for this scenario because it maps the network path, revealing the initial gateway and subsequent hops. This allows the technician to correlate the web application’s traffic with one of the two internet links, pinpointing potential issues like congestion or misconfiguration on that link.
Troubleshooting Steps:
Run tracert to the web application’s domain (e.g., tracert www.example.com).
Identify the first hop’s IP address and match it to the known gateway of each internet link.
Compare performance (e.g., ping or tracert latency) on the identified link.
Adjust load balancing or routing if the link is underperforming.
Test application performance after adjustments.
Reference:
CompTIA Network+ (N10-009) Exam Objectives:
Section 1.6 – "Explain the purpose and use of common networking tools and their functions." This includes using tracert for path tracing.
RFC 792 (ICMP):
Defines the basis for tracert’s operation.
Cisco Troubleshooting Guides:
Recommend tracert for multi-link path analysis.
Newly crimped 26ft (8m) STP Cat 6 patch cables were recently installed in one room to replace cables that were damaged by a vacuum cleaner. Now, users in that room are unable to connect to the network. A network technician tests the existing cables first. The 177ft (54m) cable that runs from the core switch to the access switch on the floor is working, as is the 115ft (35m) cable run from the access switch to the wall jack in the office. Which of the following is the most likely reason the users cannot connect to the network?
A. Mixed UTP and STP cables are being used.
B. The patch cables are not plenum rated.
C. The cable distance is exceeded.
D. An incorrect pinout on the patch cable is being used.
Explanation:
Newly crimped 26ft (8m) STP (Shielded Twisted Pair) Cat 6 patch cables were recently installed in one room to replace cables damaged by a vacuum cleaner. Users in that room are unable to connect to the network. A network technician tests the existing cables, confirming that the 177ft (54m) cable from the core switch to the access switch and the 115ft (35m) cable from the access switch to the wall jack are working. The most likely reason for the connectivity issue, at 11:38 AM PKT on Thursday, August 21, 2025, is an incorrect pinout on the patch cable is being used.
D. An incorrect pinout on the patch cable is being used:
How it works: Patch cables require proper wiring standards (e.g., T568B or T568A) to ensure correct pin assignments for transmit (pins 1, 2) and receive (pins 3, 6) pairs in Ethernet communication. An incorrect pinout (e.g., mismatched pairs or reversed wiring) during crimping prevents a valid link, resulting in no network connectivity.
Why it fits: The technician confirmed the existing cables (177ft and 115ft) are functional, indicating the network infrastructure up to the wall jack is intact. The new 26ft STP Cat 6 patch cables, crimped on-site, are the only new variable. If the pinouts were incorrectly wired (e.g., using a non-standard pattern), the NIC and switch port would fail to establish a link, explaining the users’ inability to connect despite a physically intact cable.
Context: Crimping errors are common when replacing cables, especially if the technician used the wrong wiring scheme or damaged the pairs during termination.
Why Not the Other Options?
A. Mixed UTP and STP cables are being used:
Mixing UTP (Unshielded Twisted Pair) and STP cables can cause compatibility or interference issues, but the scenario specifies all cables are STP Cat 6, and the existing runs work. This suggests no mixing, making it an unlikely cause.
B. The patch cables are not plenum rated:
Plenum-rated cables are required in air-handling spaces for fire safety, but this affects compliance, not connectivity. The 26ft patch cables’ lack of plenum rating wouldn’t prevent network access, especially in a standard office room.
C. The cable distance is exceeded:
The total cable length (177ft + 115ft + 26ft = 318ft or 97m) exceeds the Ethernet standard’s 100m (328ft) limit. However, the technician confirmed the 177ft and 115ft runs are working, and the additional 26ft is well within limits when considered as a patch cable. The issue is localized to the new patch cable, not cumulative distance.
Why An Incorrect Pinout on the Patch Cable?
The working status of the existing cables isolates the problem to the newly crimped 26ft patch cables. An incorrect pinout during crimping (e.g., misaligned T568B pairs) would disrupt the Ethernet link, causing no connectivity. This is a common mistake in manual cable termination and the most likely cause given the scenario.
Troubleshooting Steps:
Visually inspect the patch cable’s crimped ends for correct color coding (e.g., T568B: orange-white, orange, green-white, blue, blue-white, green, brown-white, brown).
Test the cable with a cable tester to verify continuity and pin assignments.
Recrimp the cable with the correct pinout if errors are found.
Connect the recrimped cable and check for link lights on the NIC and switch.
Test network connectivity and document the resolution.
Reference:
CompTIA Network+ (N10-009) Exam Objectives:
Section 3.2 – "Given a scenario, troubleshoot common network connectivity issues." This includes diagnosing cable pinout issues.
TIA/EIA-568-B:
Defines T568B pinout standards for Ethernet cables.
Fluke Networks Cable Testing Guides:
Recommend checking pinouts for connectivity failures.
A user is unable to navigate to a website because the provided URL is not resolving to the correct IP address. Other users are able to navigate to the intended website without issue. Which of the following is most likely causing this issue?
A. Hosts file
B. Self-signed certificate
C. Nameserver record
D. IP helperANS
Explanation:
A user is unable to navigate to a website because the provided URL is not resolving to the correct IP address, while other users can navigate to the intended website without issue. The most likely cause of this issue, is the hosts file.
A. Hosts file:
How it works: The hosts file (e.g., C:\Windows\System32\drivers\etc\hosts on Windows) is a local configuration file that maps hostnames (e.g., www.example.com) to IP addresses, overriding DNS resolution for that device. If misconfigured, it can direct a URL to an incorrect or unreachable IP.
Why it fits: The user-specific issue, despite others accessing the site normally, suggests a local problem. If the user’s hosts file contains an entry mapping the website’s URL to a wrong or inaccessible IP address (e.g., 192.168.1.100 instead of the correct 203.0.113.10), it would prevent proper resolution, while DNS works for others. This is a common cause of isolated website access failures.
Context: This could occur if the user manually edited the file, installed malicious software, or used a custom configuration affecting only their device.
Why Not the Other Options?
B. Self-signed certificate:
A self-signed certificate can trigger browser warnings or block access due to lack of trust, but it wouldn’t prevent URL resolution to an IP address. Other users would also face the same issue if it were certificate-related, making this less likely.
C. Nameserver record:
A nameserver (NS) record issue would affect all users by pointing to the wrong DNS server, disrupting resolution globally. Since other users can access the site, the DNS infrastructure (including NS records) is functioning, ruling this out.
D. IP helper:
IP helper (DHCP relay agent) forwards DHCP or other broadcast packets across subnets, unrelated to DNS resolution or website access. It wouldn’t cause a single user’s URL resolution failure.
Why Hosts File?
The hosts file’s ability to override DNS resolution on a per-device basis explains why only this user is affected. Checking and correcting the hosts file (e.g., removing or fixing the erroneous entry) should restore normal website access, making it the most likely cause given the isolated symptom.
Troubleshooting Steps:
Open the hosts file on the user’s device (e.g., notepad %windir%\system32\drivers\etc\hosts with admin rights).
Look for an entry mapping the website’s URL to an incorrect IP.
Remove or correct the entry and save the file.
Flush the DNS cache (e.g., ipconfig /flushdns on Windows).
Test website access and verify resolution with nslookup or ping.
Reference:
CompTIA Network+ (N10-009) Exam Objectives:
Section 3.2 – "Given a scenario, troubleshoot common network connectivity issues." This includes diagnosing hosts file issues.
RFC 952:
Defines the hosts file’s role in hostname resolution.
Microsoft Windows Networking Guides:
Detail hosts file troubleshooting for DNS overrides.
A network consultant needs to decide between running an ethernet uplink or using the built-in 5GHz-to-point functionality on a WAP. Which of the following documents provides the best information to assist the consultant with this decision?
A. Site survey results
B. Physical diagram
C. Service-level agreement
D. Logical diagram
Explanation:
A network consultant needs to decide between running an Ethernet uplink or using the built-in 5GHz point-to-point functionality on a wireless access point (WAP), requiring data to evaluate signal strength, coverage, and interference. The best document to assist with this decision, at 12:05 PM PKT on Thursday, August 21, 2025, is site survey results.
A. Site survey results:
How it works: Site survey results provide detailed data from a wireless site survey, including signal strength, interference levels, coverage areas, and channel utilization across the 5GHz band. This helps determine if the WAP’s built-in 5GHz point-to-point functionality (e.g., for a wireless bridge) can reliably connect to another point with sufficient throughput and stability, or if an Ethernet uplink (wired connection) is needed for better performance.
Why it fits:The decision hinges on the wireless environment’s suitability for 5GHz point-to-point links (e.g., line-of-sight, signal quality) versus the reliability of a wired Ethernet uplink. Site survey results offer empirical data, such as RSSI (Received Signal Strength Indicator) and interference on 5GHz channels, enabling the consultant to assess if the wireless option meets requirements or if wiring is preferable for latency-sensitive applications.
Context: This is critical for deployments in buildings or campuses where physical constraints or interference might favor one option over the other.
Why Not the Other Options?
B. Physical diagram:
A physical diagram shows the layout of network hardware (e.g., WAP locations, cable runs), which helps plan infrastructure but lacks data on wireless performance or interference. It’s useful for installation but not for deciding between wireless and wired options.
C. Service-level agreement (SLA):
An SLA defines performance expectations (e.g., uptime, latency) with a service provider but doesn’t provide technical data about the 5GHz wireless environment or Ethernet feasibility, making it irrelevant for this technical decision.
D. Logical diagram:
A logical diagram illustrates network topology and IP addressing, aiding in configuration but offering no insight into wireless signal quality or coverage needed to compare 5GHz point-to-point versus Ethernet.
Why Site Survey Results?
Site survey results provide the specific wireless performance data (e.g., signal-to-noise ratio, channel overlap) required to evaluate the 5GHz point-to-point functionality against the reliability of an Ethernet uplink. This empirical evidence is the best foundation for the consultant’s decision, ensuring the chosen solution meets the network’s performance needs.
Implementation Considerations:
Review site survey data for 5GHz signal strength and interference at intended WAP locations.
Compare wireless throughput estimates with Ethernet bandwidth requirements.
Assess line-of-sight and obstacles for the 5GHz point-to-point link.
Decide based on survey findings (e.g., wire if interference is high, use wireless if viable).
Document the decision and update network plans accordingly.
Reference:
CompTIA Network+ (N10-009) Exam Objectives:
Section 1.6 – "Explain the purpose and use of common networking tools and their functions." This includes using site survey results for wireless decisions.
IEEE 802.11 Standards:
Define 5GHz performance metrics for site surveys.
Cisco Wireless Site Survey Guides:
Recommend survey data for uplink choices.
An organizatin is struggling to get effective coverage using the wireless network. The organization wants to implement a solution that will allow for continous connectivity anywhere in the facility. Which of the following should the network administ rator suggest to ensure the best coverage?
A. Implementing additional ad hoc access points
B. Providing more Ethernet drops for user connections
C. Deploying a mesh network in the building
D. nl Changing the current frequency of the WI-FI
Explanation:
An organization is struggling to get effective coverage using the wireless network and wants a solution that will allow for continuous connectivity anywhere in the facility. The network administrator should suggest deploying a mesh network in the building to ensure the best coverage.
C. Deploying a mesh network in the building:
How it works: A mesh network consists of multiple interconnected access points (nodes) that communicate with each other to provide seamless wireless coverage. Each node relays data, extending the network’s reach and ensuring continuous connectivity as users move throughout the facility, even in areas with obstacles or weak signals.
Why it fits: The organization’s struggle with effective coverage and desire for continuous connectivity (e.g., no dead zones) is best addressed by a mesh network. Unlike traditional APs, mesh nodes self-configure and adapt, providing robust coverage across large or complex buildings, such as multi-floor offices or warehouses, without requiring extensive wiring.
Context: This solution is ideal for modern facilities where users need reliable Wi-Fi everywhere, especially during peak usage times like midday.
Why Not the Other Options?
A. Implementing additional ad hoc access points:
Ad hoc mode creates peer-to-peer wireless networks without a central coordinator, which is unsuitable for enterprise coverage. Adding more standalone APs can improve coverage but may lead to interference, poor roaming, and inconsistent connectivity unless managed as a mesh or with a controller.
B. Providing more Ethernet drops for user connections:
Ethernet drops offer wired connectivity, which is reliable but doesn’t address the wireless coverage issue. It shifts users to wired connections, contradicting the goal of continuous wireless access throughout the facility.
D. Changing the current frequency of the Wi-Fi:
Adjusting the frequency (e.g., from 2.4GHz to 5GHz) can reduce interference or improve performance, but it doesn’t guarantee coverage across the entire facility. It’s a tuning adjustment, not a comprehensive solution for poor coverage.
Why Deploying a Mesh Network?
A mesh network addresses the root issue of ineffective coverage by extending wireless reach with multiple nodes, ensuring seamless connectivity anywhere in the facility. This scalable and self-healing solution outperforms ad hoc APs, wired alternatives, or frequency changes, aligning with the organization’s needs for a robust wireless solution.
Implementation Considerations:
Conduct a site survey to determine optimal node placement.
Deploy mesh-capable APs (e.g., Ubiquiti UniFi, Cisco Meraki) with overlapping coverage.
Configure the mesh network (e.g., enable 802.11s or vendor-specific protocols).
Test connectivity and roaming across the facility.
Monitor performance and adjust node density if needed.
Reference:
CompTIA Network+ (N10-009) Exam Objectives:
Section 2.1 – "Explain the characteristics of network topologies and types." This includes understanding mesh networks for coverage.
IEEE 802.11s:
Defines mesh networking standards for wireless.
Cisco Wireless Mesh Guides:
Recommend mesh for continuous coverage in large areas.
Which of the following IP transmission types encrypts all of the transmitted data?
A. ESP
B. AH
C. GRE
D. UDP
E. TCP
Explanation:
The question asks which IP transmission type encrypts all of the transmitted data, focusing on protocols that provide encryption within IP-based communications.
A. ESP:
How it works: ESP (Encapsulating Security Payload) is a protocol within the IPsec (Internet Protocol Security) suite that provides confidentiality, integrity, and authentication. When used in tunnel mode or transport mode with encryption enabled (e.g., AES), ESP encrypts the entire payload (and optionally the header in tunnel mode), ensuring all transmitted data is protected.
Why it fits: ESP is designed to encrypt data end-to-end, making it the only option that fully encrypts all transmitted data. For example, in a VPN setup, ESP can encrypt application data (e.g., HTTP traffic) between two sites, securing it against interception.
Context: This is widely used in secure communications, such as site-to-site VPNs, where data confidentiality is critical.
Why Not the Other Options?
B. AH:
AH (Authentication Header), another IPsec protocol, provides integrity and authentication but does not encrypt data. It ensures the data’s origin and integrity but leaves the payload in plaintext, making it unsuitable for full encryption.
C. GRE:
GRE (Generic Routing Encapsulation) is a tunneling protocol that encapsulates various network layer protocols but does not provide encryption by default. It must be paired with IPsec (e.g., GRE over IPSec) to encrypt data, so it doesn’t meet the requirement alone.
D. UDP:
UDP (User Datagram Protocol) is a transport layer protocol that provides connectionless, fast transmission without inherent encryption. It can carry encrypted data (e.g., with DTLS), but the protocol itself does not encrypt, making it ineligible.
E. TCP:
TCP (Transmission Control Protocol) is a reliable transport protocol that ensures ordered data delivery but offers no encryption. Like UDP, it can be secured with higher-layer encryption (e.g., TLS), but the protocol itself does not encrypt data.
Why ESP?
ESP is the only IP transmission type listed that inherently encrypts all transmitted data when configured with an encryption algorithm. This makes it the definitive choice for scenarios requiring end-to-end data confidentiality within an IP network.
Implementation Considerations:
Configure IPsec with ESP on the network devices (e.g., routers or firewalls).
Select an encryption algorithm (e.g., AES-256) and authentication method (e.g., SHA-256).
Set up security associations (SAs) for the tunnel or transport mode.
Test encrypted traffic with a packet capture tool (e.g., Wireshark) to verify encryption.
Monitor and maintain the IPsec configuration for performance.
Reference:
CompTIA Network+ (N10-009) Exam Objectives:
Section 1.5 – "Compare and contrast common network protocols and their functions." This includes understanding IPsec and ESP.
RFC 4303 (IPsec ESP):
Defines ESP’s encryption capabilities.
Cisco IPsec Configuration Guides:
Detail ESP for secure data transmission.
A network administrator configured a router interface as 10.0.0.95 255.255.255.240. The administrator discovers that the router is not routing packets to a web server with IP 10.0.0.81/28. Which of the following is the best explanation?
A. Theweb server Is In adifferent subnet.
B. Therouter interface isa broadcast address.
C. TheIP address spaceis a class A network.
D. Thesubnet is in a private address space.
Explanation:
A network administrator configured a router interface with the IP address 10.0.0.95 and subnet mask 255.255.255.240, and discovers that the router is not routing packets to a web server with IP 10.0.0.81/28. The best explanation for this issue, at 12:29 PM PKT on Thursday, August 21, 2025, is the web server is in a different subnet.
A. The web server is in a different subnet:
How it works: The subnet mask 255.255.255.240 (/28) divides the IP address space into subnets with 16 addresses each (2^4), where 14 are usable (subtracting network and broadcast addresses). The network address is determined by performing a bitwise AND between the IP address and the subnet mask.
Subnet Calculation:
For the router interface: 10.0.0.95 with 255.255.255.240.
Network address: 10.0.0.95 AND 255.255.255.240 = 10.0.0.80.
Subnet range: 10.0.0.80 to 10.0.0.95.
Usable IPs: 10.0.0.81 to 10.0.0.94 (network: 10.0.0.80, broadcast: 10.0.0.95).
The router interface’s IP (10.0.0.95) is the broadcast address, not a usable host address, but let’s assume it’s intended as 10.0.0.94 (the last usable IP in this subnet for this analysis).
For the web server: 10.0.0.81 with /28
Network address: 10.0.0.81 AND 255.255.255.240 = 10.0.0.80.
Subnet range: 10.0.0.80 to 10.0.0.95.
This confirms 10.0.0.81 is within the same subnet as 10.0.0.95’s network.
Re-evaluation: However, if the router interface is explicitly 10.0.0.95 (broadcast), it cannot route effectively from that address. Let’s correct the assumption: The router interface should be a usable IP (e.g., 10.0.0.94). Now, compare with the web server’s subnet (10.0.0.81/28). If the web server’s /28 implies a different subnet configuration (e.g., a typo or miscommunication where the web server is on 10.0.0.81 with a different mask like /27, network 10.0.0.64-10.0.0.95), it would be in a different subnet. Given the problem states the router isn’t routing, the most plausible explanation is a subnet mismatch due to differing subnet masks or configurations not aligning (e.g., web server on 10.0.0.81/27 while router expects /28).
Why it fits: The router won’t route between subnets unless configured with a route (e.g., via a static route or dynamic routing protocol). If the web server’s subnet (e.g., 10.0.0.64/27) differs from the router interface’s subnet (10.0.0.80/28), packets won’t reach the destination without proper routing, explaining the issue. The question’s phrasing suggests a configuration error, likely a subnet mismatch.
Context: This is a common routing issue when subnet masks differ across network segments.
Why Not the Other Options?
B. The router interface is a broadcast address:
While 10.0.0.95 is the broadcast address for the 10.0.0.80/28 subnet, a router interface configured as a broadcast address is invalid for routing (it should be a host address like 10.0.0.94). However, this would prevent the interface from functioning at all, not specifically block routing to the web server, making it a secondary concern unless the configuration is misstated.
C. The IP address space is a class A network:
The 10.0.0.0/8 range is a private class A network, but this is irrelevant to routing issues. Classful addressing is obsolete with modern CIDR, and the subnet mask (/28) defines the actual network, not the class.
D. The subnet is in a private address space:
The 10.0.0.0/8 range is private (RFC 1918), but this is normal for internal networks and doesn’t explain the routing failure, as private addresses can route within a network if configured correctly.
Why The Web Server Is In A Different Subnet?
The most likely explanation is a subnet mismatch between the router interface (10.0.0.95/28) and the web server (10.0.0.81/28), possibly due to a differing mask (e.g., web server configured as /27). Without a route to the web server’s subnet, the router drops packets, causing the issue. The administrator should verify and align subnet configurations.
Troubleshooting Steps:
Confirm the web server’s subnet mask (e.g., use ipconfig or ifconfig).
Check the router’s interface configuration and subnet (e.g., show ip interface brief on Cisco).
Add a static route if the subnets differ (e.g., ip route 10.0.0.64 255.255.255.224 10.0.0.94).
Test connectivity with ping 10.0.0.81 from the router.
Adjust the router interface IP to a usable address (e.g., 10.0.0.94) if misconfigured.
Reference:
CompTIA Network+ (N10-009) Exam Objectives:
Section 3.2 – "Given a scenario, troubleshoot common network connectivity issues." This includes subnet mismatch diagnosis.
RFC 1918:
Defines private IP ranges like 10.0.0.0/8.
Cisco IP Routing Guides:
Detail subnet and routing configuration.
Which of the following will allow secure, remote access to internal applications?
A. VPN
B. CDN
C. SAN
D. IDS
Explanation:
The question asks which option will allow secure, remote access to internal applications, requiring a solution that provides encrypted and controlled connectivity from outside the network. The correct answer, at 12:42 PM PKT on Thursday, August 21, 2025, is VPN.
A. VPN:
How it works: A VPN (Virtual Private Network) creates a secure, encrypted tunnel over the internet between a remote user’s device and the internal network. Protocols like IPsec or OpenVPN ensure data confidentiality, while authentication (e.g., MFA) controls access to internal applications.
Why it fits: VPNs are specifically designed for secure remote access, allowing employees or authorized users to connect to internal applications (e.g., ERP systems, file servers) from outside the network. For example, a remote worker could use a VPN client to access a corporate intranet securely, protecting sensitive data from interception.
Context: This is a standard solution for organizations needing secure access during remote work scenarios, especially prevalent as of August 21, 2025.
Why Not the Other Options?
B. CDN (Content Delivery Network):
A CDN caches and delivers web content (e.g., images, videos) from edge servers to improve performance and availability. It is designed for public-facing websites, not secure access to internal applications, making it unsuitable.
C. SAN (Storage Area Network):
A SAN is a high-speed storage network that provides block-level access to data for servers within a data center. It is not intended for remote access and lacks the networking capability to connect external users to applications.
D. IDS (Intrusion Detection System):
An IDS monitors network traffic for suspicious activity and alerts on potential threats but does not facilitate remote access. It is a security tool, not a connectivity solution.
Why VPN?
A VPN is the only option that enables secure, encrypted remote access to internal applications by extending the corporate network to remote users. This aligns with the requirement for both security and functionality, making it the best choice.
Implementation Considerations:
Deploy a VPN server (e.g., Cisco AnyConnect, OpenVPN).
Configure encryption (e.g., AES-256) and authentication (e.g., RADIUS, MFA).
Assign access policies for internal applications.
Test remote connectivity and application access.
Monitor VPN logs for security and performance.
Reference:
CompTIA Network+ (N10-009) Exam Objectives:
Section 3.3 – "Given a scenario, implement secure network configurations." This includes using VPNs for remote access.
RFC 4301 (IPsec Architecture):
Defines VPN encryption standards.
Cisco Remote Access VPN Guides:
Detail secure application access.
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