N10-009 Exam Dumps - CompTIA Network+ Certification Exam

Shielded twisted pair, or STP, is the best choice because the problem is related to electromagnetic interference, and the requirement is to keep costs low. STP cabling includes shielding around the twisted pairs or cable bundle to reduce the effects of external interference from electrical equipment, appliances, fluorescent lighting, microwave ovens, motors, and other sources. Since the cable is routed near a break room with known interference, replacing unshielded cabling with shielded twisted pair is the most practical and cost-effective solution.

The CompTIA Network+ N10-009 objectives require understanding copper cabling types, interference, and appropriate media selection. Fiber-optic cabling, including single-mode and multimode fiber, is immune to electromagnetic interference and could solve the issue, but it is generally more expensive than copper due to optics, termination, installation, and equipment requirements. Unshielded twisted pair is inexpensive but provides less protection against interference. Because the issue is caused by interference and the organization wants to control cost, STP provides the best balance of performance, protection, and affordability.

The correct answer is PAT (Port Address Translation). According to the CompTIA Network+ N10-009 objectives, PAT is a form of Network Address Translation (NAT) that allows multiple internal hosts—or services—to be mapped to a single public IP address using different port numbers. PAT can also translate destination port numbers, which is exactly what is occurring in this scenario.

In this case, the firewall receives incoming traffic on port 80 (commonly used for HTTP) and forwards it to an internal server listening on port 88. This process is often referred to as port forwarding, which is a practical implementation of PAT. The firewall rewrites the destination port and potentially the destination IP address so that external clients can access internal services without exposing internal addressing schemes.

The other options do not apply. TLS and SSL are encryption protocols used to secure data in transit; they do not perform port translation. FHRP (First Hop Redundancy Protocol), such as HSRP or VRRP, provides gateway redundancy and high availability, not traffic forwarding or port remapping.

The Network+ objectives emphasize understanding how firewalls and NAT technologies manipulate IP addresses and ports to enable secure access to internal resources. PAT is the technology that enables this functionality, making it the correct answer.

BGP (Border Gateway Protocol) is used for routing data between different ISPs, making it essential for the functioning of the internet. Its primary use is for exchanging routing information between autonomous systems, especially different ISPs. Preventing loops within a LAN ishandled by protocols like Spanning Tree Protocol (STP), while improving reconvergence times and sharing routes with a Layer 3 switch are functions of other protocols or internal mechanisms.

VLAN hopping is an attack where an attacker crafts packets with multiple VLAN tags, allowing them to traverse VLAN boundaries improperly. This can result in gaining unauthorized access to network segments that are supposed to be isolated. The other options do not involve the use of multiple network tags. MAC flooding aims to overwhelm a switch’s MAC address table, DNS spoofing involves forging DNS responses, and ARP poisoning involves sending fake ARP messages.

Role of the Hosts File:

The hosts file is a local file on a computer that maps hostnames to IP addresses. It can be used to override DNS resolution by providing a static mapping of a hostname to an IP address.

Common Issues with the Hosts File:

If an incorrect IP address is mapped to a hostname in the hosts file, it can cause the computer to resolve the hostname to the wrong IP address. This can lead to navigation issues for specific websites while other users, relying on DNS, do not face the same problem.

Why Other Options are Less Likely:

Self-signed certificate: Relates to SSL/TLS and would cause a security warning, not a navigation failure.

Nameserver record: Affects all users, not just one.

IP helper: Used to forward DHCP requests and is unrelated to DNS resolution issues.

Troubleshooting Steps:

Check the hosts file on the affected user ' s computer (C:\Windows\System32\drivers\etc\hosts on Windows or /etc/hosts on Unix/Linux).

Look for entries that map the problematic hostname to an incorrect IP address and correct or remove them.

This scenario is best described as an on-path attack. In an on-path attack, a malicious actor positions themselves between the user and the intended destination, allowing them to intercept, inspect, redirect, or modify traffic. The clue is that the banking web page looks different when the user is not using the VPN, but appears correctly and allows login when the VPN is enabled. A VPN encrypts traffic between the user’s device and the VPN endpoint, which helps prevent local network attackers from altering or reading the traffic.

The CompTIA Network+ N10-009 objectives include common network attacks such as on-path attacks, ARP poisoning, rogue access points, and evil twin attacks. ARP spoofing and ARP poisoning are techniques that can be used to create an on-path position on a local network, but the question describes the broader attack outcome rather than specifically proving ARP manipulation. An evil twin is a fake wireless access point that impersonates a legitimate one, but the question does not directly state that the user connected to a fake SSID. Therefore, on-path attack is the best answer.

IPsec (Internet Protocol Security) is the most secure way to provide site-to-site connectivity. It provides robust security services, such as data integrity, authentication, and encryption, ensuringthat data sent across the network is protected from interception and tampering. Unlike other options, IPsec operates at the network layer and can secure all traffic that crosses the IP network, making it the most comprehensive and secure choice for site-to-site VPNs.References: CompTIA Network+ study materials and NIST Special Publication 800-77.