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NEW QUESTION # 488
A network technician is designing a LAN for a new facility. The company is expecting more than 300 devices to connect to the network. Which of the following masks will provide the most efficient subnet?
Answer: B
Explanation:
The requirement is to support over 300 hosts. The subnet mask 255.255.254.0 (or /23) provides 512 addresses, 510 of which are usable - ideal for around 300 devices.
* 255.255.0.0 (/16) provides too many addresses.
* 255.255.192.0 (/18) gives 16384 addresses - overkill.
* 255.255.255.254 is invalid for host assignments (only 2 addresses, 0 usable).
From Andrew Ramdayal's guide:
"To support 300 hosts, a /23 subnet (255.255.254.0) offers 510 usable addresses - the most efficient choice without excessive overhead."
NEW QUESTION # 489
Which of the following types of routes takes precedence when building a routing table for a given subnet?
Answer: B
Explanation:
The correct answer is Static because static routes have a lower administrative distance (AD) than most dynamic routing protocols, giving them higher priority when a router selects routes for the same destination network. According to CompTIA Network+ (N10-009) routing objectives, administrative distance is used to determine the trustworthiness of a route source when multiple routing protocols provide a path to the same subnet. The lower the administrative distance, the more preferred the route.
By default, a static route has an administrative distance of 1, which is lower than OSPF (110) and BGP (20 for eBGP, 200 for iBGP). Because of this, when identical routes to a subnet exist from both static and dynamic sources, the router installs the static route in the routing table.
A default route (0.0.0.0/0) is only used when no more specific route exists and does not take precedence over specific static or dynamic routes.
Therefore, when building the routing table for a given subnet and comparing route sources, static routes take precedence due to their lower administrative distance.
NEW QUESTION # 490
A group of users cannot connect to network resources. The technician runs ipconfig from one user's device and is able to ping the gateway shown from the command. Which of the following is most likely preventing the users from accessing network resources?
Answer: C
Explanation:
A rogue DHCP server occurs when an unauthorized or misconfigured DHCP server assigns incorrect IP addresses, default gateways, or DNS settings to clients.
*In this scenario:
*The user can ping the gateway, meaning local network communication is working.
*However, they cannot access network resources, which suggests incorrect IP configuration (likely due to a rogue DHCP server assigning the wrong gateway or DNS).
*Why not the other options?
*VLAN hopping (A): This is an attack that exploits VLAN configurations to gain access to unauthorized VLANs. It would not typically cause multiple users to lose network access.
*Distributed DoS (C): A DDoS attack floods a network or service with traffic, but this issue is more likely misconfigured IP settings than an actual attack.
*Evil twin (D): This refers to a fraudulent Wi-Fi network mimicking a legitimate one. Since the users are on a wired network (ipconfig output checked), this is not applicable.
NEW QUESTION # 491
A help desk technician receives a report that users cannot access internet URLs. The technician performs ping tests and finds that sites fail when a URL is used but succeed when an IP is used.
Which of the following tools should the technician utilize next?
Answer: B
Explanation:
The issue is clearly related to DNS resolution, as IP-based connections succeed but domain name-based ones fail.
dig (Domain Information Groper) is a DNS lookup tool used to troubleshoot DNS problems by querying name servers directly.
NEW QUESTION # 492
What is the most likely cause when a mobile device frequently experiences dropped calls, data interruptions, and fast battery drain with a weak signal?
Answer: B
Explanation:
When signal strength is poor, mobile devices constantly boost their transmission power in an attempt to maintain a stable connection. This results in dropped calls/data and rapid battery drain. Since a repeater was installed, misalignment or misconfiguration could be degrading the signal strength.
* A. WPS applies to Wi-Fi, not cellular repeaters.
* C. Channel frequency might matter for interference, but signal strength is the most direct cause of the described symptoms.
* D. Power budget applies to PoE and wired devices, not mobile phones.
References (CompTIA Network+ N10-009):
* Domain: Network Troubleshooting - Wireless/cellular troubleshooting, signal strength impact, user symptoms (battery drain, poor connectivity).
NEW QUESTION # 493
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