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IT認証試験に合格したい受験生の皆さんはきっと試験の準備をするために大変悩んでいるでしょう。しかし準備しなければならないのですから、落ち着かない心理になりました。しかし、JPNTestのCompTIAのN10-009トレーニング資料を利用してから、その落ち着かない心はなくなった人がたくさんいます。JPNTestのCompTIAのN10-009トレーニング資料を持っていたら、自信を持つようになります。試験に合格しない心配する必要がないですから、気楽に試験を受けることができます。これは心のヘルプだけではなく、試験に合格することで、明るい明日を持つこともできるようになります。
質問 # 311
A firewall administrator is mapping a server's internal IP address to an external IP address for public use.
Which of the following is the name of this function?
正解：B
解説：
Network Address Translation (NAT) is a process that allows a device, typically a firewall or router, to map private IP addresses to public IP addresses. This enables internal network devices to communicate over the internet using a single or a limited number of public IP addresses.
Static NAT (One-to-One Mapping): Maps a single private IP address to a single public IP address, commonly used for servers that need to be accessible from the internet.
Dynamic NAT (Many-to-Many Mapping): Dynamically assigns a public IP from a pool to internal devices.
PAT (Port Address Translation): A type of NAT where multiple private IPs share a single public IP using different port numbers.
Incorrect Options:
B: VIP (Virtual IP Address): Used in load balancing and high-availability configurations, not for NAT.
C: PAT (Port Address Translation): A specific form of NAT, but the question refers to general NAT, making option A the best choice.
D: BGP (Border Gateway Protocol): A routing protocol used to exchange information between different networks, not related to NAT.
Reference:
CompTIA Network+ N10-009 Official Study Guide - Chapter on Network Address Translation (NAT)
質問 # 312
Which of the following protocols is commonly associated with TCP port 443?
正解：B
解説：
HTTPS uses TCP port 443 to establish SSL/TLS-encrypted web sessions, securing HTTP traffic.
質問 # 313
A company is implementing a new internal network in which all devices use IPv6 addresses.
Which of the following routing protocols will be best for this setup?
正解：B
解説：
OSPFv3 is specifically designed to support IPv6, providing native routing capabilities for IPv6 networks, unlike earlier versions that were built for IPv4.
質問 # 314
A network technician is working on a PC with a faulty NIC. The host is connected to a switch with secured ports. After testing the connection cables and using a known-good NIC, the host is still unable to connect to the network. Which of the following is causing the connection issue?
正解：B
解説：
If a switch has port security enabled (such as sticky MAC or a configured allowed MAC), the port will only allow the original NIC's MAC address. When a new NIC with a different MAC address is installed, the port rejects traffic, preventing network connectivity.
B . BPDU guard protects against rogue switches, not end hosts.
C . Link aggregation applies when bundling multiple uplinks, not a single PC connection.
D . PoE budget applies to powered devices like APs, not PCs.
Reference (CompTIA Network+ N10-009):
質問 # 315
Which of the following ports is used for secure email?
正解：A
解説：
Port 587 is used for secure email submission. This port is designated for message submission by mail clients to mail servers using the SMTP protocol, typically with STARTTLS for encryption.
Port 25: Traditionally used for SMTP relay, but not secure and often blocked by ISPs for outgoing mail due to spam concerns.
Port 110: Used for POP3 (Post Office Protocol version 3), not typically secured.
Port 143: Used for IMAP (Internet Message Access Protocol), which can be secured with STARTTLS or SSL/TLS.
Port 587: Specifically used for authenticated email submission (SMTP) with encryption, ensuring secure transmission of email from clients to servers.
Network Reference:
CompTIA Network+ N10-007 Official Certification Guide: Discusses email protocols and ports, including secure email transmission.
Cisco Networking Academy: Provides training on securing email communications and the use of appropriate ports.
Network+ Certification All-in-One Exam Guide: Explains email protocols, ports, and security considerations for email transmission.
質問 # 316
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