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CompTIA Linux+ Certification Exam Sample Questions (Q776-Q781):

NEW QUESTION # 776
A Linux administrator is tasked with implementing a solution that will centralize information and allow it to be searchable and available for reporting purposes.
Which of the following server roles should the administrator implement?

A. NTP
B. Proxy
C. SSH
D. DNS
E. Logging

Answer: E

NEW QUESTION # 777
A Linux administrator wants to verify the runtime parameters of a container's ENTRYPOINT process. Which of the following commands will allow the administrator to achieve this goal?

A. docker ps container
B. docker inspect container
C. docker logs container
D. docker ls container

Answer: B

Explanation:
To examine runtime configuration, including ENTRYPOINT and CMD, the docker inspect command is used.
* A is correct: docker inspect <container> provides detailed JSON-formatted output with ENTRYPOINT, command, volumes, environment variables, etc.
Incorrect Options:
* B: Invalid command.
* C: Shows running containers and basic status, not configuration.
* D: Displays logs, not config parameters.
Reference:
CompTIA Linux+ XK0-005 Study Guide, Chapter 12
man docker-inspect

NEW QUESTION # 778
A Linux administrator is trying to start the database service on a Linux server but is not able to run it. The administrator executes a few commands and receives the following output:

Which of the following should the administrator run to resolve this issue? (Choose two.)

A. systemctl unmask mariadb
B. chkconfig mariadb on
C. systemctl start mariadb
D. service mariadb reload
E. journalctl -g mariadb
F. dnf reinstall mariadb

Answer: A,C

Explanation:
These commands will unmask the mariadb service, which is currently prevented from starting, and then start it normally.

NEW QUESTION # 779
A server is experiencing intermittent connection issues. Some connections to the Internet work as intended, but some fail as if there is no connectivity. The systems administrator inspects the server configuration:
Which of the following is MOST likely the cause of the issue?

A. The ARP table contains incorrect entries.
B. An internal-only DNS server is configured.
C. Two default routes are configured.
D. The IP netmask is wrong for ens3.

Answer: C

Explanation:
The most likely cause of the issue is that two default routes are configured on the server. The default route is the route that is used when no other route matches the destination of a packet. The default route is usually the gateway that connects the local network to the Internet. The server configuration shows that there are two default routes in the routing table, one with the gateway 192.168.1.1 and the other with the gateway 10.0.0.1.
This can cause a conflict and confusion for the server when deciding which gateway to use for the outgoing packets. Some packets may be sent to the wrong gateway and fail to reach the Internet, while some packets may be sent to the correct gateway and work as intended. This can result in intermittent connection issues and inconsistent behavior. The administrator should remove one of the default routes and keep only the correct one for the network. This can be done by using the ip route del command or by editing the network configuration files. This will resolve the issue and restore the connectivity. The other options are incorrect because they are not supported by the outputs. The DNS server, the IP netmask, and the ARP table are not the causes of the issue. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 12:
Managing Network Connections, pages 381-382.

NEW QUESTION # 780
The application team has reported latency issues that are causing the application to crash on the Linux server.
The Linux administrator starts
troubleshooting and receives the following output:

Which of the following commands will improve the latency issue?

A. # echo 'net.core.net_backlog = 5000000' >> /etc/sysctl.conf# sysctl -p# systemctl daemon-reload
B. # ifdown eth0# ip link set dev eth0 mtu 800# ifup eth0
C. # systemctl stop network# ethtool -g eth0 512# systemctl start network
D. # echo 'net.core.rmem max = 12500000' >> /etc/sysctl.conf# echo 'net.core.wmem_max = 12500000'
>> /etc/sysctl.conf# sysctl -p

Answer: D

Explanation:
The best command to use to improve the latency issue is D. # echo 'net.core.rmem max = 12500000' >> /etc
/sysctl.conf # echo 'net.core.wmem_max = 12500000' >> /etc/sysctl.conf # sysctl -p. This command will increase the size of the receive and send buffers for the network interface, which can improve the network performance and reduce packet loss. The sysctl command will apply the changes to the kernel parameters without rebooting the system.
The other commands are either incorrect or not suitable for this task. For example:
* A. # echo 'net.core.net_backlog = 5000000' >> /etc/sysctl.conf # sysctl -p # systemctl daemon-reload will try to increase the backlog queue for incoming connections, but this is not relevant for the latency issue. The systemctl daemon-reload command is also unnecessary, as it only reloads the systemd configuration files, not the kernel parameters.
* B. # ifdown eth0 # ip link set dev eth0 mtu 800 # ifup eth0 will try to change the maximum transmission unit (MTU) of the network interface to 800 bytes, but this is too low and may cause fragmentation and performance degradation. The default MTU for Ethernet is 1500 bytes, and it should not be changed unless there is a specific reason.
* C. # systemctl stop network # ethtool -g eth0 512 # systemctl start network will try to change the ring buffer size of the network interface to 512, but this is too small and may cause packet drops and latency spikes. The default ring buffer size for Ethernet is usually 4096 or higher, and it should be increased if there is a high network traffic.

NEW QUESTION # 781
......

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