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A systems administrator was tasked with assigning the temporary IP address/netmask 192.168.168.1/255.255.255.255 to the interface eth0 of a Linux server.
When adding the address, the following error appears:
# ip address add 192.168.168.1/33 dev eth0
Error: any valid prefix is expected rather than "192.168.168.1/33".
Based on the command and its output above, which of the following is the cause of the issue?
The cause of the issue is that the CIDR value /33 is invalid for an IPv4 address. The CIDR value represents the number of bits in the network prefix of an IP address, and it can range from 0 to 32 for IPv4 addresses. A CIDR value of /33 would imply a network prefix of more than 32 bits, which is impossible for an IPv4 address. To assign a temporary IP address/netmask of 192.168.168.1/255.255.255.255 to eth0, the CIDR value should be /32 instead, which means a network prefix of 32 bits and a host prefix of 0 bits. There is no route to 192.168.168.1/33 is not the cause of the issue, as the ip address add command does not check the routing table. The interface eth0 does not exist is not the cause of the issue, as the ip address add command would display a different error message if the interface does not exist. The IP address 192.168.168.1 is already in use is not the cause of the issue, as the ip address add command would display a different error message if the IP address is already in use.:[CompTIA Linux+ (XK0-005) Certification Study Guide], Chapter 13: Networking Fundamentals, page 435.
A newly created container has been unable to start properly, and a Linux administrator is analyzing the cause of the failure. Which of the following will allow the administrator to determine the FIRST command that is executed inside the container right after it starts?
The command that will allow the administrator to determine the first command that is executed inside the container right after it starts is docker inspect <container_id>. This command will display detailed information about the container, including its configuration, state, network settings, mounts, and logs. One of the configuration fields is ''Entrypoint'', which shows the command that is executed when the container is run. The entrypoint can be specified in the Dockerfile or overridden at runtime using the --entrypoint option.
The other options are not correct commands for determining the first command that is executed inside the container. The docker export <container_id> command will export the contents of the container's filesystem as a tar archive to STDOUT. This will not show the entrypoint of the container, but only its files. The docker info <container_id> command is invalid because docker info does not take any arguments. It shows system-wide information about Docker, such as the number of containers, images, volumes, networks, and storage drivers. The docker start <container_id> command will start a stopped container and attach its STDOUT and STDERR to the terminal. This will not show the entrypoint of the container, but only its output.:docker inspect | Docker Docs;docker export | Docker Docs;docker info | Docker Docs;docker start | Docker Docs
A user (userA) has reported issues while logging in to the system. The following output has been provided:
bash
Could not chdir to home directory /home/userA: Permission denied
-bash: /home/userA/.bash_profile: Permission denied
# cat /etc/passwd | grep userA
userA:x:1234:3400:userA account:/home/userA/:/bin/bash
# passwd -S userA
userA PS 2022-10-17 1 99999 0 (Password set. SHA512 crypt.)
# groups userA
admin dev usergrp
# ls -lth /home/
drwx------ 7 root admin 9 Jan 17 2019 userA
drwxr-xr-x 4 userC app 9 Jan 23 2020 userC
Which of the following describes the issue userA is having?
The issue occurs because the home directory /home/userA is owned by root, not by userA, as seen from the ls -lth /home output. In Linux, the user must have ownership of their home directory to log in and access their files properly. To fix this, the administrator must change ownership using chown userA:userA /home/userA.
A Linux administrator is testing a web application on a laboratory service and needs to temporarily allow DNS and HTTP/HTTPS traffic from the internal network. Which of the following commands will accomplish this task?
A systems administrator wants to check for running containers. Which of the following commands can be used to show this information?
The command that can be used to check for running containers isdocker ps. Thedocker pscommand can list all the containers that are currently running on the system. To show all the containers, including those that are stopped, the administrator can usedocker ps -a.:
[CompTIA Linux+ Study Guide], Chapter 11: Working with Containers, Section: Managing Containers with Docker
[Docker PS Command with Examples]
