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便利なN10-008資格関連題 &合格スムーズN10-008日本語講座 |効果的なN10-008試験対応

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CompTIA Network+ Certification Exam 認定 N10-008 試験問題 (Q105-Q110):

質問 # 105
A technician is troubleshooting reports that a networked printer is unavailable. The printer's IP address is configured with a DHCP reservation, but the address cannot be pinged from the print server in the same subnet. Which of the following is MOST likely the cause of me connectivity failure?

A. DNS failure
B. Incorrect VLAN
C. DHCP scope exhaustion
D. Incorrect gateway

正解：B

解説：
* A VLAN is a virtual local area network that logically separates devices on the same physical network.
VLANs can improve network performance, security, and management by reducing broadcast domains and isolating traffic.
* A DHCP reservation is a feature that allows a network administrator to assign a specific IP address to a device based on its MAC address. This ensures that the device always receives the same IP address from the DHCP server, even if the lease expires or the device reboots.
* A networked printer is a device that can be shared by multiple users on the same network. A networked printer typically has a built-in network interface card (NIC) that allows it to communicate with other devices using TCP/IP protocols.
* A print server is a device or a software application that manages the printing requests from multiple clients. A print server can also provide additional features such as print queue management, printer driver installation, and printer status monitoring.
* A subnet is a logical division of an IP network that allows devices to communicate more efficiently and securely. A subnet is defined by a network address and a subnet mask, which determine the range of valid IP addresses within the subnet. Devices on the same subnet can communicate directly with each other without the need for a router.
* A ping is a network diagnostic tool that tests the connectivity and reachability between two devices by sending and receiving echo packets. A ping request can fail for various reasons, such as network congestion, firewall settings, routing issues, or device configuration errors.
* Based on the question, the networked printer is unavailable because it cannot be pinged from the print server in the same subnet. This means that there is a problem with the layer 2 connectivity between the two devices, which is determined by the MAC addresses and the VLANs. The most likely cause of this problem is that the printer and the print server are on different VLANs, which prevents them from communicating with each other. The other options are less likely because they affect the layer 3 connectivity, which is determined by the IP addresses and the gateways. A DNS failure would not affect the ping request, since it uses IP addresses and not hostnames. A DHCP scope exhaustion would not affect the printer, since it has a DHCP reservation that guarantees its IP address. An incorrect gateway would not affect the communication within the same subnet, since it is only used for routing packets to other networks. References:
* CompTIA Network+ N10-008 Study Guide, Chapter 2: Network Devices and Technologies, Section
2.2: Network Device Functions and Features, Subsection: Print Servers, pp. 76-77.
* CompTIA Network+ N10-008 Study Guide, Chapter 3: Network Operations, Section 3.3: Network Configuration Management, Subsection: DHCP, pp. 144-146.
* CompTIA Network+ N10-008 Study Guide, Chapter 4: Network Security, Section 4.2: Network Segmentation and Isolation, Subsection: VLANs, pp. 202-204.
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 1.5: Network Troubleshooting Methodology, Subsection: Identify the Problem, pp. 16-17.
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 2.2: Network Devices, Subsection: Print Servers, p. 28.
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 2.6: Network Addressing, Subsection: DHCP, p. 38.
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 2.7: Network Addressing, Subsection: Subnetting, p. 39.
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 3.5: Network Segmentation, Subsection: VLANs, p. 58.

質問 # 106
A network technician crimped a length of IJTP with TIAElA-568A on one end and TINE-IA-5688 on the other. Which of the following cable types did the technician create?

A. Crossover cable
B. Patch cable
C. Twinaxial cable
D. Rollover cable

正解：A

解説：
Explanation
The cable type that the technician created is a crossover cable. A crossover cable is a type of twisted-pair cable that has the transmit and receive pairs reversed on one end. A crossover cable is used to connect two devices of the same type, such as two switches or two computers, without using a hub or a switch. A crossover cable can be made by crimping one end of the cable with TIA/EIA-568A standard and the other end with TIA/EIA-568B standard, or vice versa. These standards define the color coding and pin assignments for RJ-45 connectors on twisted-pair cables. References: CompTIA Network+ N10-008 Certification Study Guide, page
53; The Official CompTIA Network+ Student Guide (Exam N10-008), page 2-4.

質問 # 107
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?

A. DNS
B. Routing table
C. Subnet mask
D. Default gateway

正解：D

解説：
Explanation
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.
References
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

質問 # 108
A homeowner frequently has guests visit and would like to install a wireless router for their personal devices. The homeowner wants to ensure that the wireless router is compatible with the widest range of devices possible. Which of the following standards should a technician suggest?

A. 802 11ac
B. 802.11b
C. 802.11g
D. 802.11n

正解：D

質問 # 109
An organization requires the ability to send encrypted email messages to a partner from an email server that is hosted on premises. The organization prefers to use the standard default ports when creating firewall rules. Which of the following ports should be open to satisfy the requirements?

A. 0
B. 1
C. 2
D. 3

正解：A

解説：
Port 587 is used for email message submission, typically by clients to an email server. It supports the encrypted transmission of email messages using Transport Layer Security (TLS) or Secure Sockets Layer (SSL). Ports 110 and 143 are used for email retrieval by clients from an email server. Port 636 is used for LDAP over SSL.

質問 # 110
......

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