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A network administrator is in the process of installing a new broadband circuit. The administrator assigns the new static IP address with a /30 prefix. However,
the administrator is unable to connect to the internet. Given the following information:
IP address: 4.11.17.6
Subnet mask: 255.255.255.252
Default gateway: 4.11.17.1
DNS1: 1.1.1.1
DNS2: 8.8.8.8
Which of the following is the most likely cause?
The most likely cause of the administrator's inability to connect to the internet is the incorrect default gateway. The default gateway is the IP address of the router that connects the local network to the internet. The default gateway should be in the same subnet as the IP address of the device. However, in this case, the IP address of the device is 4.11.17.6 and the subnet mask is 255.255.255.252, which means the subnet has only four addresses: 4.11.17.4, 4.11.17.5, 4.11.17.6, and 4.11.17.7. The first and the last addresses are reserved for the network and the broadcast, respectively, so the only valid addresses for the device and the gateway are 4.11.17.5 and 4.11.17.6. Therefore, the default gateway should be 4.11.17.5, not 4.11.17.1, which is in a different subnet. The routing table, the subnet mask, and the DNS are not the causes of the problem, as they are either correct or irrelevant for the internet connectivity.
Reference
1: CompTIA Network+ N10-008 Certification Study Guide, page 83-84
2: CompTIA Network+ N10-008 Exam Subnetting Quiz, question 8
3: CompTIA Network+ N10-008 Certification Practice Test, question 3
A network administrator needs to provide evidence to confirm that recent network outages were caused by increased traffic generated by a recently released application. Which of the following actions will BEST support the administrator's response?
During the troubleshooting of an E1 line, the point-to-point link on the core router was accidentally unplugged and left unconnected for several hours. However, the network management team was not notified. Which of the following could have been configured to allow early detection and possible resolution of the issue?
Traps are unsolicited messages sent by network devices to a network management system (NMS) when an event or a change in status occurs. Traps can help notify the network management team of any issues or problems on the network, such as a link failure or a device reboot. Traps can also trigger actions or alerts on the NMS, such as sending an email or logging the event. MIB stands for Management Information Base and is a database of information that can be accessed and managed by an NMS using SNMP (Simple Network Management Protocol). OID stands for Object Identifier and is a unique name that identifies a specific variable in the MIB. Baselines are measurements of normal network performance and behavior that can be used for comparison and analysis.
A network consultant is working with a software-defined network and is troubleshooting an issue with an application's instructions being properly translated for the network components. Which of the following is most likely at fault?
The issue with an application's instructions being properly translated for network components is most likely at theApplication layer. Here's why:
Infrastructure layer: This layer deals with physical components (e.g., switches, routers) and is unlikely to cause translation issues.
Session layer: Responsible for establishing, maintaining, and terminating communication sessions but not directly related to application instructions.
Control layer: Not a standard OSI layer; it's likely a misnomer.
Application layer: This layer handles application-specific protocols and data. Translation issues often occur here.
Therefore, the correct answer isD. Application laye
A network technician is installing a wireless network in an office building. After performing a site survey, the technician determines the area is very saturated on the 2.4GHz and the 5GHz bands. Which of the following wireless standards should the network technician implement?
802.11 ax is the latest wireless standard that operates in both the 2.4GHz and the 5GHz bands. It offers higher throughput, lower latency, and improved efficiency compared to previous standards. It also uses technologies such as OFDMA and MU-MIMO to reduce interference and increase capacity in dense environments. Therefore, 802.11 ax is the best choice for a wireless network in an office building with high saturation on both bands.
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