CompTIA XK0-005 問題集

質問 1：
A security team informs the Linux administrator that a specific server is acting as an open relay.
To which of the following is the security team referring?
A. The server is running the SSH service and is open to the Internet, allowing outside sources to log into the server without source IP address filtering.
B. The server is acting as a web proxy and allowing outside unauthenticated sources to connect to the server, effectively hiding the source's IP address for malicious activities.
C. The server has an email service configured to allow outside sources to send email to other external parties on the Internet without validation.
D. The server is acting as an unmanaged router, open to the Internet, and is allowing outside Internet traffic into the network with no filtering.
正解：C

質問 2：
Users are reporting that a Linux server is responding slowly. A systems administrator troubleshooting the server issue sees the following:

Which of the following is most likely the issue?
A. The CPU capacity is inadequate.
B. / filesystem does not have enough storage allocated.
C. The CPU is mostly waiting for I/O operations.
D. /var filesystem is almost full.
正解：C
解説: (Topexam メンバーにのみ表示されます)

質問 3：
A Linux administrator needs to restart a server and wants to see if any users are currently connected to it. Which of the following commands should the administrator run to find this information?
A. w
B. man
C. id
D. host
正解：A

質問 4：
A Linux administrator wants to include a standard, hash_profile file whenever a new local user is created on Linux server.
Which of the following is the BEST location to place the file?
A. /Home/default_user/
B. /etc/profile.d/
C. /etc/skel/
D. /User/local/
正解：D

質問 5：
An administrator would like to measure possible packet loss between a workstation and a remote web application that is running on port 443. Which of the following would be the best command for the administrator to use to display this information?
A. mtr -T -P 443
B. traceroute -p 443
C. tcpdump -p 443
D. ping -c 50
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 6：
A Linux administrator needs to check the content of a log file that is appending data as the file grows. Which of the following commands should the administrator use to accomplish this task?
A. tail -c log.txt
B. tail -v log.txt
C. tail -f log.txt
D. tail log.txt
正解：C

質問 7：
Which of the following describes how a user's public key is used during SSH authentication?
A. The user's public key is used to hash the password during SSH authentication.
B. The user's public key is used instead of a password to allow server access.
C. The user's public key is verified against a list of authorized keys. If it is found, the user is allowed to log in.
D. The user's public key is used to encrypt the communication between the client and the server.
正解：C