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質問 # 190
A systems administrator recently installed a new virtual server. After completing the installation, the administrator was only able to reach a few of the servers on the network. While testing, the administrator discovered only servers that had similar IP addresses were reachable. Which of the following is the most likely cause of the issue?
- A. There is an improper DNS configuration.
- B. The jumbo frames are not enabled.
- C. The subnet mask is incorrect.
- D. There is an IP address conflict.
正解：C
解説：
A subnet mask is a number that distinguishes the network address and the host address within an IP address1. A subnet mask allows network traffic to understand IP addresses by splitting them into the network and host addresses. If the subnet mask is incorrect, the network traffic may not be able to determine the correct destination for the packets, and only reach some of the servers that have similar IP addresses. For example, if the new virtual server has an IP address of 192.168.1.100 and a subnet mask of 255.255.0.0, it can only communicate with servers that have IP addresses in the range of 192.168.0.0 to 192.168.255.2552. To fix this issue, the systems administrator needs to check and correct the subnet mask of the new virtual server according to the network configuration.
質問 # 191
An administrator needs to reconfigure a teamed network connection on a server in a remote data center. Which of the following will offer the most resilient connection while performing this change?
- A. Use of a VNC console
- B. Use of an 00B solution
- C. Use of a crash cart
- D. Use of an RDP console
正解：B
解説：
An out-of-band (OOB) solution is a method of accessing and managing a server remotely without using the network connection or the operating system of the server. An OOB solution can use a dedicated management port, a serial console, or a KVM switch to provide a resilient connection while performing changes to the network configuration of the server. An OOB solution is more reliable than a VNC or RDP console, which depend on the network and the operating system, and more convenient than a crash cart, which requires physical access to the server.
References: CompTIA Server+ SK0-005 Certification Study Guide, Chapter 2, Lesson 2.3, Objective 2.3
質問 # 192
リモート データセンターのサーバーが応答しなくなりました。この障害を調査するための最良の解決策は次のうちどれですか?
- A. 帯域外管理
- B. Secure Shell 接続
- C. リモート デスクトップ
- D. クラッシュ カート経由でアクセス
正解：A
解説：
The best solution to investigate the failure of a server in a remote datacenter is out-of-band management.
Out-of-band management is a method of accessing and controlling a server or a device using a dedicated channel that is separate from its normal network connection. Out-of-band management can use various technologies, such as serial ports, modems, KVM switches, or dedicated management cards or interfaces.
Out-of-band management can provide remote access to servers or devices even when they are powered off, unresponsive, or disconnected from the network. Out-of-band management can enable troubleshooting, configuration, maintenance, or recovery tasks without requiring physical presence at the server location.
質問 # 193
システム管理者は、RFC 1918 標準に準拠したアドレス空間を使用する LAN 上にサーバーをセットアップしています。標準に準拠するには、管理者が次の IP アドレスのどれを使用する必要がありますか?
- A. 172.16.19.241
- B. 171.245.198.241
- C. 11.251.196.241
- D. 193.168.145.241
正解：A
解説：
The administrator should use 172.16.19.241 as an IP address to be in compliance with RFC 1918 standard.
RFC 1918 defines three ranges of IP addresses that are reserved for private internets, meaning they are not globally routable on the public Internet and can be used within an enterprise without any risk of conflict or overlap with other networks. These ranges are:
10.0.0.0 - 10.255.255.255 (10/8 prefix) 172.16.0.0 - 172.31.255.255 (172.16/12 prefix) 192.168.0.0 -
192.168.255.255 (192.168/16 prefix)
Out of these ranges, only 172.16.19.241 falls within one of them (172.16/12 prefix). The other options are either public IP addresses that belong to other organizations or networks (11.251.196.241, 171.245.198.241) or invalid IP addresses that do not conform to any standard (193.168.145.241).
Reference: https://whatis.techtarget.com/definition/RFC-1918
質問 # 194
最近のアプリケーションの移行により、企業の現在のストレージ ソリューションは、データが複数のユーザーによってリアルタイムでアクセスされる場合に、パフォーマンスに影響を与えずにデータをホストするために必要な要件を満たしていません。この問題の最善の解決策は次のうちどれですか?
- A. データを圧縮して空き容量を増やします。
- B. 新しいファイバー チャネル SAN ソリューションを展開します。
- C. 影響を受けるユーザーのために、ローカルの外付けハード ドライブをインストールします。
- D. データが格納されるサーバーにメモリを追加します。
正解：B
解説：
Explanation
A Fibre Channel SAN solution is a type of storage area network (SAN) that uses high-speed optical fiber cables to connect servers and storage devices. A SAN allows for hosting data without impacting performance when the data is accessed in real time by multiple users, as it provides fast data transfer rates, low latency, high availability, and scalability12. A local external hard drive (A) would not be suitable for multiple users, as it would limit the accessibility and security of the data. Adding extra memory to the server (B) would not solve the problem of data access performance, as it would not increase the bandwidth or reduce the congestion of the network. Compressing the data would not improve the performance either, as it would add extra overhead and complexity to the data processing and retrieval. References: 1
https://www.techradar.com/best/best-cloud-storage 2
https://solutionsreview.com/data-storage/the-best-enterprise-data-storage-solutions/
質問 # 195
The management team has mandated the encryption of all server administration traffic. Which of the following should MOST likely be implemented?
- A. FTPS
- B. VPN
- C. SSH
- D. SELinux
正解：C
解説：
SSH stands for Secure Shell and it is a network protocol that provides encrypted and authenticated communication between two hosts. SSH can be used to remotely access and administer a server using a command-line interface or a graphical user interface. SSH can ensure the encryption of all server administration traffic, which can prevent eavesdropping, tampering, or spoofing by unauthorized parties.References:
https://www.comptia.org/training/resources/exam-objectives/comptia-server-sk0-005-exam-objectives (Objective 2.4)
質問 # 196
サーバー技術者は、サーバーに新しい NIC をインストールし、IP 接続用に NIC を構成します。次に、技術者は ping コマンドを使用して接続をテストします。次の ping および ipconfig コマンドの出力の一部を考えてみます。
問題の原因となったのは次のうちどれですか?
- A. 重複した IP アドレス
- B. デフォルトゲートウェイが正しくありません
- C. DHCP の設定ミス
- D. 不正なルーティング テーブル
正解：A
解説：
The ping command output shows that the NIC has an IP address of 192.168.1.100 and a default gateway of 192.168.1.1. However, when the technician tries to ping the default gateway, the reply comes from another IP address: 192.168.1.101. This means that there is another device on the network that has the same IP address as the default gateway, and it is responding to the ping request instead of the intended destination.
A duplicate IP address can cause network connectivity problems, such as packet loss, routing errors, or unreachable hosts. To resolve this issue, the technician should either change the IP address of the default gateway or the device that is conflicting with it, or use DHCP to assign IP addresses automatically and avoid conflicts.
The other options are not correct because they do not explain the ping output. An incorrect default gateway would cause no reply or a destination unreachable message, not a reply from a different IP address. A DHCP misconfiguration would cause an invalid or no IP address on the NIC, not a duplicate IP address on the network. An incorrect routing table would cause routing errors or unreachable destinations, not a reply from a different IP address.
Reference:
https://askleo.com/what_is_ping_and_what_does_its_output_tell_me/
https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/ping
質問 # 197
技術者は、タイプ 1 ハイパーバイザーをサーバーにインストールする必要があります。サーバーには、SD カード スロット、SAS コントローラー、および SATA コントローラーがあり、NAS に接続されています。技術者がハイパーバイザーをインストールするドライブ タイプは次のうちどれですか?
- A. NASドライブ
- B. SATA ドライブ
- C. SDカード
- D. SAS ドライブ
正解：C
解説：
Explanation
A SD card is a type of flash memory card that can be used to store data and run applications. A SD card can be used to install a Type 1 hypervisor on a server, as it provides fast boot time, low power consumption, and high reliability. A Type 1 hypervisor runs directly on the underlying computer's physical hardware, interacting directly with its CPU, memory, and physical storage. For this reason, Type 1 hypervisors are also referred to as bare-metal hypervisors. A Type 1 hypervisor takes the place of a host operating system and VM resources are scheduled directly to the hardware by the hypervisor123. A NAS drive (B) is a type of network-attached storage (NAS) device that provides shared access to files and data over a network. A NAS drive cannot be used to install a Type 1 hypervisor on a server, as it requires a network connection and a host operating system to function. A SATA drive is a type of hard disk drive (HDD) or solid state drive (SSD) that uses the Serial ATA (SATA) interface to connect to a computer. A SATA drive can be used to install a Type 1 hypervisor on a server, but it may have some disadvantages compared to a SD card, such as slower boot time, higher power consumption, and lower reliability. A SAS drive (D) is a type of hard disk drive (HDD) or solid state drive (SSD) that uses the Serial Attached SCSI (SAS) interface to connect to a computer. A SAS drive can also be used to install a Type 1 hypervisor on a server, but it may have similar disadvantages as a SATA drive, and it may also be more expensive and less compatible than a SD card. References:
https://phoenixnap.com/kb/what-is-hypervisor-type-1-2 https://www.ibm.com/topics/hypervisors 3
https://www.redhat.com/en/topics/virtualization/what-is-a-hypervisor
質問 # 198
技術者は、データ ドライブを新しい Windows サーバーから注文した Windows サーバーに移動しました。ハードウェアはドライブを認識しますが、データは OS から認識されません。問題の最も可能性の高い原因は次のうちどれですか?
- A. パーティションは ext4 でフォーマットされています。
- B. パーティションは FAT32 でフォーマットされています。
- C. ディスクは MBn を使用しています。
- D. ディスクは GPT を使用しています。
正解：D
解説：
Explanation
GPT (GUID Partition Table) is a partitioning scheme that allows creating partitions on large hard drives (more than 2 TB). It supports up to 128 partitions per drive and uses 64-bit addresses to locate them. However, GPT is not compatible with older versions of Windows, such as Windows XP or Windows Server 2003, which use MBR (Master Boot Record) as the partitioning scheme. If a disk uses GPT, it may not be recognized or accessible by an older Windows server. Verified References: [GPT], [MBR]
質問 # 199
サーバー管理者は、新しいストレージ アレイをサーバーに接続しています。管理者はアレイの複数の IP アドレスを取得しました。サーバーがアレイへの接続に使用する可能性が最も高いのは、次の接続タイプのうちどれですか?
- A. eSATA
- B. iSCSI
- C. FC
- D. USB
正解：B
解説：
iSCSI is a protocol that allows SCSI commands to be transmitted over IP networks, enabling remote access to storage devices. iSCSI uses IP addresses to identify and communicate with the storage array, so having multiple IP addresses for the array indicates that iSCSI is being used. eSATA, USB, and FC are other types of connections that use different protocols and connectors than iSCSI. Reference: CompTIA Server+ Certification Exam Objectives, Domain 3.0: Storage, Objective 3.1: Given a scenario, install and deploy primary storage devices based on given specifications and interfaces.
質問 # 200
サーバー技術者は、レガシー サーバー ハードウェアに新しいサーバー OS をインストールしています。OS が意図したとおりに動作することを保証するために、技術者が最初に行うべきことは次のうちどれですか?
- A. ハード ドライブを低レベル フォーマットして、古いデータが残っていないことを確認します。
- B. HCL を参照して、すべてがサポートされていることを確認してください。
- C. 物理サーバーを仮想サーバーに移行します。
- D. 適切な冷却を確保するために、ケースとファンにほこりがないことを確認してください。
正解：B
解説：
Since this is legacy server hardware it would be important to make sure that it can handle/support a particular O/S before attempting an install. The rest of the answers have little to nothing to do with an install an O/S on legacy hardware.
質問 # 201
新興企業は、初期の災害復旧サイトをセットアップする必要があります。サイトはコスト効率が高く、迅速に導入できる必要があります。会社が設立すべきサイトは次のうちどれですか?
- A. ホット
- B. 暖かい
- C. コロケーション
- D. 寒い
正解：D
解説：
A cold site is a backup facility with little or no hardware equipment installed. A cold site is the most cost- effective option among the three disaster recovery sites. However, due to the fact that a cold site doesn't have any pre-installed equipment, it takes a lot of time to properly set it up so as to fully resume business operations1.
References = 1: Disaster Recovery Sites Comparison: Which one to Choose? - NAKIVO(https://www.nakivo.
com/blog/overview-disaster-recovery-sites/)
質問 # 202
サーバー管理者はリモート アクセスを使用してサーバーを更新しています。管理者は、YUM を使用してサーバー上のアプリケーションを更新するときに、多数のエラー メッセージが表示されることに気づきました。管理者が最初に確認すべき点は次のうちどれですか?
- A. /var ディレクトリ内のディスク容量
- B. サーバー上の LVM ステータス
- C. YUM 依存関係
- D. サーバー上のネットワーク接続
正解：A
解説：
The administrator should check disk space in the /var directory first when using YUM to update applications on a server. YUM stands for Yellowdog Updater Modified, which is a software package manager for Linux systems that use RPM (Red Hat Package Manager) packages. YUM downloads and installs packages from online repositories and resolves dependencies automatically. YUM stores its cache files in the /var/cache/yum directory by default. These cache files include metadata and package data for each repository that YUM uses. If there is not enough disk space in the /var directory, YUM may fail to update applications and generate error messages.
質問 # 203
While running a local network security scan an administrator discovers communication between clients and one of the web servers is happening in cleartext. Company policy requires all communication lo be encrypted. Which of the following ports should be closed to stop the deartext communication?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
解説：
Port 21 is used for FTP (File Transfer Protocol), which is a protocol that transfers files between servers and clients in cleartext, meaning that anyone can intercept and read the data. To stop this communication, port 21 should be closed on the web server and replaced with a secure protocol, such as SFTP (Secure File Transfer Protocol) or FTPS (File Transfer Protocol Secure), which use encryption to protect the data. Verified Reference: [FTP vs SFTP vs FTPS]
質問 # 204
管理者は、ネットワーク共有に最近出現したいくつかの予期しないドキュメントとビデオ ファイルを調査しています。管理者はファイルのプロパティを確認し、文書上の作成者の名前が会社員ではないことを確認しました。管理者は他のユーザーに質問しますが、ファイルについては誰も知りません。次に管理者はログ ファイルをチェックし、ファイルをサーバーにコピーするために FTP プロトコルが使用されたことを発見します。この問題が再発しないようにするには、次のうちどれを行う必要がありますか?
- A. ユーザー アカウント制御をオンにします。
- B. データ損失防止を実装します。
- C. 侵入検知を設定します。
- D. 匿名アクセスを無効にします。
正解：D
解説：
This is the best solution to prevent unauthorized files from being copied to the server via FTP because anonymous access allows anyone to log in to the FTP server without providing a username or password.
Disabling anonymous access will require users to authenticate with valid credentials before accessing the FTP server. References: https://docs.microsoft.com/en-us/iis/configuration/system.applicationhost/sites/site
/ftpserver/security/authentication/anonymousauthentication
質問 # 205
After installing a new file server, a technician notices the read times for accessing the same file are slower than the read times for other file servers.
Which of the following is the first step the technician should take?
- A. Add more memory.
- B. Enable link aggregation.
- C. Check if the cache is turned on.
- D. Install faster hard drives.
正解：C
解説：
The cache is a temporary storage area that holds frequently accessed data or instructions for faster retrieval. The cache can improve the read times for accessing files by reducing the need to access the hard drive, which is slower than the cache memory1. Therefore, the first step the technician should take is to check if the cache is turned on for the new file server. If the cache is turned off, the technician should enable it and see if the read times improve. The other options are incorrect because they are not the first steps to take.
Adding more memory, installing faster hard drives, or enabling link aggregation are possible ways to improve the performance of the file server, but they are more costly and time-consuming than checking the cache.
Moreover, they may not address the root cause of the problem if the cache is turned off.
質問 # 206
サーバー管理者は、Linux サーバーで MySQL を構成する際に問題を経験しています。管理者が getenforce コマンドを発行すると、次の出力が表示されます。
># Enforcing
MySQL を正常に構成するために管理者が発行する必要があるコマンドは次のうちどれですか?
- A. setenforce 許容
- B. setenforce 無効
- C. setenforce 1
- D. setenforce 0
正解：D
解説：
https://blogs.oracle.com/mysql/selinux-and-mysql-v2
質問 # 207
多くのサーバー ラックを備えたサーバー ルームは、リモートで管理され、時折オンサイト サポートが行われます。サーバー上でローカルにネットワークの問題を管理およびトラブルシューティングするための最も費用対効果の高いオプションは、次のうちどれですか?
- A. クラッシュカート
- B. 管理ポート
- C. KVM
- D. IP KVM
正解：D
解説：
Explanation
An IP KVM (keyboard, video, mouse) is a device that allows remote access and control of multiple servers over a network using a web browser or a client software. An IP KVM is a cost-effective option to administer and troubleshoot network problems locally on the servers, as it eliminates the need for physical presence or dedicated hardware for each server. A management port (A) is a network interface that is used for out-of-band management of network devices, such as routers or switches. A management port does not provide local access to servers. A crash cart (B) is a mobile unit that contains a monitor, keyboard, mouse, and other tools for troubleshooting servers in a data center. A crash cart requires physical access to each server and may not be cost-effective for many racks of servers. A KVM (D) is a device that allows switching between multiple servers using a single keyboard, video, and mouse. A KVM does not provide remote access over a network and requires physical connection to each server. References:
https://www.enterprisestorageforum.com/management/best-data-storage-solutions-and-software-2021/
https://www.microsoft.com/en-us/microsoft-365/business-insights-ideas/resources/cloud-storage-vs-on-premises
質問 # 208
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