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質問 # 15
A local firm has hired a consulting company to clean up its IT infrastructure. The consulting company notices remote printing is accomplished by port forwarding via publicly accessible IPs through the firm's firewall Which of the following would be the MOST appropriate way to enable secure remote printing?
- A. SSL
- B. VPN
- C. SSH
- D. Telnet
正解：B
解説：
VPN (Virtual Private Network) is the most appropriate way to enable secure remote printing. VPN is a technology that creates a secure and encrypted tunnel over a public network such as the Internet. It allows remote users or sites to access a private network as if they were directly connected to it. VPN can be used for various purposes such as accessing corporate resources, bypassing geo-restrictions, or enhancing privacy and security. VPN can also be used for remote printing by allowing users to connect to a printer on the private network and send print jobs securely over the VPN tunnel. References:
https://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/14106-how-vpn-works
質問 # 16
A branch of a company recently switched to a new ISP. The network engineer was given a new IP range to assign. The ISP assigned 196.26.4.0/26, and the branch gateway router now has the following configurations on the interface that peers to the ISP:
The network engineer observes that all users have lost Internet connectivity. Which of the following describes the issue?
- A. The incorrect subnet mask was configured
- B. The incorrect interface was configured
- C. The incorrect gateway was configured
- D. The incorrect IP address was configured
正解：A
質問 # 17
A network technician is investigating an issue with a desktop that is not connecting to the network. The desktop was connecting successfully the previous day, and no changes were made to the environment. The technician locates the switchport where the device is connected and observes the LED status light on the switchport is not lit even though the desktop is turned on Other devices that arc plugged into the switch are connecting to the network successfully Which of the following is MOST likely the cause of the desktop not connecting?
- A. Damaged cable
- B. VLAN mismatch
- C. Port security
- D. Duplex mismatch
- E. Transceiver mismatch
正解：A
解説：
Explanation
A damaged cable is most likely the cause of the desktop not connecting to the network. A damaged cable can cause physical layer issues such as loss of signal, attenuation, interference, or crosstalk. These issues can prevent the desktop from establishing a link with the switch and result in the LED status light on the switchport being off. Other possible causes of physical layer issues are faulty connectors, ports, or transceivers. References: https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet/14119-37.html
質問 # 18
A security engineer is installing a new IOS on the network. The engineer has asked a network administrator to ensure all traffic entering and leaving the router interface is available for the IDS.
Which of the following should the network administrator do?
- A. Install an additional NIC into the IDS
- B. Add an additional route on the router for the IDS.
- C. Install a loopback adapter for the IDS.
- D. Configure ACLs to route traffic to the IDS.
- E. Install a network tap for the IDS
正解：E
質問 # 19
A network technician is working at a new office location and needs to connect one laptop to another to transfer files. The laptops are newer models and do not have Ethernet ports. Access points are not available either. Which Of the following types Of wireless network SSIDs does the network technician need to configure to be able to connect the laptops together?
- A. Independent Basic Service Set
- B. Basic Service Set
- C. Distribution System Service
- D. Extended Service Set
正解：A
解説：
An Independent Basic Service Set (IBSS) is a type of wireless network that does not require an access point or a wired network. An IBSS allows wireless devices to communicate directly with each other using ad hoc mode. An IBSS is also known as an ad hoc network or a peer-to-peer network. A network technician can configure an IBSS to connect two laptops together and transfer files.
質問 # 20
Which of the following are environmental factors that should be considered when installing equipment in a building? (Choose two.)
- A. Proximity to nearest MDF
- B. Floor construction type
- C. Fire suppression system
- D. Humidity control
- E. Power load
- F. UPS location
正解：C、D
質問 # 21
Users in a remote office report that corporate web server pages are taking a long time to load, whereas users in the main corporate office do not have any issues. Which of the following is the best metric for a network administrator to check?
- A. Server NetFlow data
- B. Jitter across the network
- C. Server interface CRC errors
- D. Hop-by-hop network latency
正解：D
解説：
The best metric for a network administrator to check is hop-by-hop network latency. This is because network latency is the time it takes for a packet to travel from the source to the destination, and it affects the loading speed of web pages. Hop-by-hop network latency measures the latency between each pair of routers or switches along the network path, and it can help identify where the delay is occurring. By checking the hop-by-hop network latency, the network administrator can determine if the problem is caused by a slow or congested link, a misconfigured or faulty device, or a routing issue.
Jitter is the variation in latency over time, and it affects the quality of voice and video applications. Jitter does not directly affect the loading speed of web pages, and it is not a useful metric for troubleshooting this issue.
Server interface CRC errors are errors that occur when the cyclic redundancy check (CRC) of a packet does not match the expected value, indicating data corruption. Server interface CRC errors can affect the reliability and integrity of data transmission, and they can be caused by faulty cables, connectors, or interfaces. Server interface CRC errors do not necessarily affect the loading speed of web pages, unless they are severe enough to cause retransmissions or packet loss.
Server NetFlow data is data that is collected and analyzed by the NetFlow protocol, which monitors and reports on network traffic flows. Server NetFlow data can provide information on the volume, type, and direction of traffic that is sent or received by the server, as well as the source and destination IP addresses, ports, and protocols. Server NetFlow data can help identify network usage patterns, trends, and anomalies, but it does not measure the latency or performance of the network.
Reference What is Network Latency and How to Measure It How to Troubleshoot Network Latency Issues What is Jitter and How to Measure It What is CRC Error and How to Fix It What is NetFlow and How Does It Work CompTIA Network+ Certification All-in-One Exam Guide, Eighth Edition (Exam N10-008)
質問 # 22
An administrator is preparing an organization for a potential disaster. The administrator configures the network switches and turns off the equipment in a data center. Which of the following is this scenario an example of?
- A. Cold site
- B. Cloud site
- C. Warm site
- D. Hot site
正解：A
質問 # 23
Which of the following refers to a weakness in a mechanism or technical process?
- A. Risk
- B. Exploit
- C. Threat
- D. Vulnerability
正解：D
解説：
The term that refers to a weakness in a mechanism or technical process is vulnerability. A vulnerability is a flaw or gap in a system's security that can be exploited by an attacker to gain unauthorized access, compromise data, or cause damage. A vulnerability can be caused by design errors, configuration errors, software bugs, human errors, or environmental factors. For example, an outdated software version that has known security holes is a vulnerability that can be exploited by malware or hackers. Reference: CompTIA Network+ N10-008 Certification Study Guide, page 342; The Official CompTIA Network+ Student Guide (Exam N10-008), page 13-7.
質問 # 24
Which of the following is the best action to take before sending a network router to be recycled as electronic waste?
- A. Turn on port security.
- B. Shred the switch hard drive.
- C. Remove the company asset ID tag.
- D. Back up and erase the configuration.
正解：D
解説：
Explanation
Before disposing of a network router, it is important to back up and erase the configuration to prevent unauthorized access to sensitive data and network settings. A network router may contain information such as passwords, IP addresses, firewall rules, VPN settings, and other network parameters that could be exploited by hackers or malicious users. By backing up the configuration, you can preserve the network settings for future reference or reuse. By erasing the configuration, you can wipe out the data and restore the router to its factory default state.
質問 # 25
A company requires a disaster recovery site to have equipment ready to go in the event of a disaster at its main datacenter. The company does not have the budget to mirror all the live data to the disaster recovery site.
Which of the following concepts should the company select?
- A. Cold site
- B. Cloud site
- C. Hot site
- D. Warm site
正解：D
解説：
Explanation
A warm site is a type of disaster recovery site that has equipment ready to go in the event of a disaster at the main datacenter, but does not have live data or applications. A warm site requires some time and effort to restore the data and services from backups, but it is less expensive than a hot site that has live data and applications. A cold site is a disaster recovery site that has no equipment or data, and requires a lot of time and money to set up after a disaster. A cloud site is a disaster recovery site that uses cloud computing resources to provide data and services, but it may have issues with bandwidth, latency, security, and cost. References:
https://www.comptia.org/blog/what-is-a-warm-site
質問 # 26
A bank installed a new smart TV to stream online video services, but the smart TV was not able to connect to the branch Wi-Fi. The next day, a technician was able to connect the TV to the Wi- Fi, but a bank laptop lost network access at the same time. Which of the following is the MOST likely cause?
- A. Hidden SSID
- B. DHCP scope exhaustion
- C. AP configuration reset
- D. Channel overlap
正解：D
解説：
When two or more wireless networks use the same channel, they can interfere with each other, causing problems with connectivity. This is especially likely to happen if the networks are close together, such as in a bank branch.
In this case, the smart TV was able to connect to the Wi-Fi because it was using a different channel than the laptop. However, when the technician changed the channel of the smart TV, it caused the laptop to lose network access because they were now using the same channel.
質問 # 27
Which of the following routing protocols is BEST suited for use on a perimeter router?
- A. EIGRP
- B. OSPF
- C. RIPv2
- D. BGP
正解：D
解説：
BGP stands for Border Gateway Protocol and it is used to exchange routing information between autonomous systems (AS) on the Internet. A perimeter router is a router that connects an AS to another AS or to the Internet. Therefore, BGP is the best suited routing protocol for a perimeter router.
References: Network+ Study Guide Objective 2.4: Compare and contrast the characteristics of network topologies, types and technologies.
質問 # 28
A technician is troubleshooting intermittent connectivity between devices and viewing the following syslog entries from a switch:
Which of the following are these entries indicative of?
- A. Link flapping
- B. Jitter
- C. DDoS attack
- D. Latency
正解：A
解説：
The syslog entries are indicative of link flapping, which is when a switch port rapidly transitions between the up and down states. This can cause intermittent connectivity issues, network instability, and increased CPU utilization on the switch. Link flapping can be caused by various factors, such as faulty cables, misconfigured interfaces, duplex mismatches, or network attacks. To troubleshoot link flapping, the technician should check the physical layer, verify the interface settings, and monitor the network traffic for anomalies.
References:
* What is Link Flapping? - CompTIA1
* Troubleshooting Switch Port and Interface Problems - Cisco2
* Network Troubleshooting - N10-008 CompTIA Network+ : 4.1 - YouTube3
質問 # 29
A network engineer receives the following when connecting to a switch to configure a port:
Which of the following is the MOST likely cause for the failure?
- A. The network engineer does not have permission to configure the device
- B. SNMP has been secured with an ACL
- C. The network engineer is using the wrong protocol
- D. The switchport the engineer is trying to configure is down
正解：D
質問 # 30
A network technician is investigating an issue with handheld devices in a warehouse. Devices have not been connecting to the nearest APs, but they have been connecting to an AP on the far side of the warehouse. Which of the following is the MOST likely cause of this issue?
- A. An incorrect channel assignment is on the nearest APs.
- B. The power level is too high for the AP on the far side.
- C. Interference exists around the AP on the far side.
- D. The nearest APs are configured for 802.11g.
正解：B
解説：
The power level is a setting that determines how strong the wireless signal is from an access point (AP). If the power level is too high for an AP on the far side of a warehouse, it can cause interference and overlap with other APs on the same channel or frequency. This can result in handheld devices not connecting to the nearest APs, but connecting to the AP on the far side instead. A technician should adjust the power level of the AP on the far side to reduce interference and improve connectivity. Reference: https://www.comptia.org/blog/what-is-power-level
質問 # 31
Which of the following cable types would MOST likely be used to provide high-speed network connectivity between nearby buildings?
- A. Twinaxial
- B. UTP
- C. Fiber
- D. Cat 5
- E. Coaxial
正解：C
質問 # 32
Which of the following devices would be used to manage a corporate WLAN?
- A. A wireless router
- B. A wireless controller
- C. A wireless bridge
- D. A wireless NAS
正解：B
解説：
A wireless controller is used to manage a corporate WLAN, providing centralized management and configuration of access points. Reference: CompTIA Network+ Certification Study Guide, Chapter 8: Wireless Networks.
質問 # 33
Which of the following routing protocols is used to exchange route information between public autonomous systems?
- A. EGRIP
- B. OSPF
- C. BGP
- D. RIP
正解：C
解説：
BGP (Border Gateway Protocol) is a routing protocol used to exchange route information between public autonomous systems (AS). OSPF (Open Shortest Path First), EGRIP (Enhanced Interior Gateway Routing Protocol), and RIP (Routing Information Protocol) are all used for internal routing within a single AS.
Therefore, BGP is the correct option to choose for this question.
References:
* Network+ N10-007 Certification Exam Objectives, Objective 3.3: Given a scenario, configure and apply the appropriate routing protocol.
* Cisco: Border Gateway Protocol (BGP) Overview
質問 # 34
A wireless network technician is receiving reports from some users who are unable to see both of the corporate SSIDs on their mobile devices. A site survey was recently commissioned, and the results verified acceptable RSSI from both APs in all user areas. The APs support modern wireless standards and are all broadcasting their SSIDs. The following table shows some of the current AP settings:
Which of the following changes would result in all of the user devices being capable of seeing both corporate SSIDs?
- A. Implementing omnidirectional antennas for both APs
- B. Configuring the highest power settings for both APs
- C. Configuring both APs to use the 802.11ac wireless standard
- D. Implementing the WPA2 Enterprise authentication standard
正解：C
解説：
Explanation
The change that would result in all of the user devices being capable of seeing both corporate SSIDs is configuring both APs to use the 802.11ac wireless standard. 802.11ac is a wireless standard that operates in the 5 GHz frequency band and offers high data rates and performance. However, not all wireless devices support 802.11ac, especially older ones that only operate in the 2.4 GHz frequency band. In the table, AP1 uses 802.11b, which is an outdated wireless standard that operates in the 2.4 GHz frequency band and offers low data rates and performance. AP2 uses 802.11a, which is an older wireless standard that operates in the 5 GHz frequency band and offers moderate data rates and performance. Therefore, some user devices may not be able to see both SSIDs because they are incompatible with either 802.11b or 802.11a. By configuring both APs to use 802.11ac, which is backward compatible with previous wireless standards, all user devices should be able to see both SSIDs. References: CompTIA Network+ N10-008 Certification Study Guide, page 75; The Official CompTIA Network+ Student Guide (Exam N10-008), page 2-18.
質問 # 35
Which of the following network devices can perform routing between VLANs?
- A. Bridge
- B. Load balancer
- C. Layer 3 switch
- D. Layer 2 switch
正解：C
質問 # 36
A network is experiencing a number of CRC errors during normal network communication. At which of the following layers of the OSI model will the administrator MOST likely start to troubleshoot?
- A. Layer 7
- B. Layer 3
- C. Layer 6
- D. Layer 2
- E. Layer 1
- F. Layer 5
- G. Layer 4
正解：E
解説：
CRC errors are cyclic redundancy check errors that occur when data is corrupted during transmission. CRC errors are usually caused by physical layer issues such as faulty cables, connectors, ports, or interference. The network administrator will most likely start to troubleshoot at layer 1 of the OSI model, which is the physical layer that deals with the transmission of bits over a medium. Reference: CompTIA Network+ Certification Exam Objectives Version 2.0 (Exam Number: N10-006), Domain 4.0 Network Troubleshooting and Tools, Objective 4.1 Given a scenario, implement network troubleshooting methodology.
質問 # 37
A network engineer is configuring new switches. Some of the trunk ports are in a blocking state. Which of the following should the network engineer reconfigure?
- A. STP
- B. Port mirroring
- C. LACP
- D. Flow control
正解：A
解説：
STP (Spanning Tree Protocol) is a protocol that prevents loops in a network by placing some of the switch ports in different states, such as blocking, listening, learning, forwarding, or disabled. A port in the blocking state does not forward frames or participate in frame forwarding. A network engineer can reconfigure STP to change the port states and avoid blocking ports that are needed for trunking.
質問 # 38
A technician needs to map the path of a PC to the router. Which of the following tools should the technician use to accomplish this task?
- A. traceroute
- B. netstat
- C. ifconfig
- D. ping
正解：A
質問 # 39
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