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最新的 CompTIA Network+ N10-009 免費考試真題 (Q25-Q30):
問題 #25
Which of the following disaster recovery metrics is used to describe the amount of data that is lost since the last backup?
A. RPO
B. RTO
C. MTTR
D. MTBF
答案:A
解題說明:
Definition of RPO:
Recovery Point Objective (RPO) is a disaster recovery metric that describes the maximum acceptable amount of data loss measured in time. It indicates the point in time to which data must be recovered to resume normal operations after a disaster.
For example, if the RPO is set to 24 hours, then the business could tolerate losing up to 24 hours' worth of data in the event of a disruption.
Why RPO is Important:
RPO is critical for determining backup frequency and helps businesses decide how often they need to back up their data. A lower RPO means more frequent backups and less potential data loss.
Comparison with Other Metrics:
MTTR (Mean Time to Repair): Refers to the average time required to repair a system or component and return it to normal operation.
RTO (Recovery Time Objective): The maximum acceptable length of time that a computer, system, network, or application can be down after a failure or disaster occurs.
MTBF (Mean Time Between Failures): The predicted elapsed time between inherent failures of a system during operation.
How RPO is Used in Disaster Recovery:
Organizations establish RPOs to ensure that they can recover data within a timeframe that is acceptable to business operations. This involves creating a backup plan that meets the RPO requirements.
Reference:
CompTIA Network+ study materials and certification guides.
問題 #26
A user notifies a network administrator about losing access to a remote file server. The network administrator is able to ping the server and verifies the current firewall rules do not block access to the network fileshare.
Which of the following tools wold help identify which ports are open on the remote file server?
A. Dig
B. nslookup
C. Tracert
D. Nmap
答案:D
解題說明:
Nmap (Network Mapper) is a powerful network scanning tool used to discover hosts and services on a computer network. It can be used to identify which ports are open on a remote server, which can help diagnose access issues to services like a remote file server.
* Port Scanning: Nmap can perform comprehensive port scans to determine which ports are open and what services are running on those ports.
* Network Discovery: It provides detailed information about the host's operating system, service versions, and network configuration.
* Security Audits: Besides troubleshooting, Nmap is also used for security auditing and identifying potential vulnerabilities.
Network References:
* CompTIA Network+ N10-007 Official Certification Guide: Covers network scanning tools and their uses.
* Nmap Documentation: Official documentation provides extensive details on how to use Nmap for port scanning and network diagnostics.
* Network+ Certification All-in-One Exam Guide: Discusses various network utilities, including Nmap, and their applications in network troubleshooting.
問題 #27
A technician is troubleshooting a user's laptop that is unable to connect to a corporate server. The technician thinks the issue pertains to routing. Which of the following commands should the technician use to identify the issue?
A. dig
B. tcpdump
C. tracert
D. arp
答案:C
解題說明:
The tracert (Traceroute) command is used to determine the path packets take from the source to the destination. It helps in identifying routing issues by showing each hop the packets pass through, along with the time taken for each hop. This command can pinpoint where the connection is failing or experiencing delays, making it an essential tool for troubleshooting routing issues.References: CompTIA Network+ study materials and common network troubleshooting commands.
問題 #28
Which of the following is a cost-effective advantage of a split-tunnel VPN?
A. Cloud-based traffic flows outside of the company's network.
B. Web traffic is filtered through a web filter.
C. Monitoring detects insecure machines on the company's network.
D. More bandwidth is required on the company's internet connection.
答案:A
解題說明:
A split-tunnel VPN allows certain traffic (e.g., cloud-based services) to bypass the VPN and go directly to the Internet. This reduces the amount of traffic that needs to traverse the company's VPN and Internet connection, conserving bandwidth and reducing costs. It also means that not all traffic is subject to the same level of inspection or filtering, which can improve performance for cloud-based services.
Reference: CompTIA Network+ study materials.
問題 #29
Which of the following is the most closely associated with segmenting compute resources within a single cloud account?
A. laaS
B. VPC
C. Network security group
D. Hybrid cloud
答案:B
問題 #30
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