The command semanage port -a -t http_port_t -p tcp 6379 adds a new port definition to the SELinux

policy and assigns the type http_port_t to the port 6379/tcp. This allows the web application to run

on this port and accept connections from users. This is the correct way to resolve the issue. The other

options are incorrect because they either delete a port definition (-d), use the wrong protocol

(top instead of tcp), or list the existing port definitions (-l). : CompTIA Linux+ (XK0-005) Certification

Study Guide, Chapter 18: Securing Linux Systems, page 535.

The most probable cause of the connectivity issue is that the network interface cable is not

connected to a switch. This can be inferred from the output of the ip link list dev eth0 command,

which shows that the network interface eth0 has the NO-CARRIER flag set. This flag indicates that

there is no physical link detected on the interface, meaning that the cable is either unplugged or

faulty. The other options are not valid causes of the issue. The address ac:00:11:22:33:cd is a valid

Ethernet address, as it follows the format of six hexadecimal octets separated by colons. The

Ethernet broadcast address should be ff:ff:ff:ff:ff:ff, which is the default value for all interfaces. The

network interface eth0 is not using an old kernel module, as it shows the UP flag, which indicates

that the interface is enabled and ready to transmit data. : CompTIA Linux+ (XK0-005) Certification

Study Guide, Chapter 14: Managing Networking

https://kxbjsyuhceggsyvxdkof.supabase.co/storage/v1/object/public/file-images/Linux+_XK0-005/page_145_img_1.jpg

To create an appropriate device label, format and create an ext4 file system on the new partition, you

can use the following commands:

To create a GPT (GUID Partition Table) label on the new drive /dev/sdc, you can use the parted

command with the -s option (for script mode), the device name (/dev/sdc), the mklabel command,

and the label type (gpt). The command is:

parted -s /dev/sdc mklabel gpt

To create a primary partition of 10 GB on the new drive /dev/sdc, you can use the parted command

with the -s option, the device name (/dev/sdc), the mkpart command, the partition type (primary),

the file system type (ext4), and the start and end points of the partition (1 and 10G). The command

is:

parted -s /dev/sdc mkpart primary ext4 1 10G

To format and create an ext4 file system on the new partition /dev/sdc1, you can use the mkfs

command with the file system type (ext4) and the device name (/dev/sdc1). The command is:

mkfs.ext4 /dev/sdc1

You can verify that the new partition and file system have been created by using the lsblk command,

which will list all block devices and their properties.

part for

detailed answer of

each part.

Explanation:

Part 1

Here is the step-by-step command construction process:

1. Move the private key (likely named server1 based on the provided details) to the .ssh directory:

mv ~/server1 ~/.ssh/id_rsa

This command moves the private key (assuming it's named server1) from the home directory (~) to

the .ssh directory and renames it to id_rsa (which is the default SSH private key file name).

2. Set the correct permissions for the private key file:

chmod 600 ~/.ssh/id_rsa

The private key file should be readable and writable only by the owner to maintain security.

3. Connect to the server using the private key and the correct port (2222):

ssh -i ~/.ssh/id_rsa -p 2222 admin@server1

This command tells ssh to use the specified private key (-i ~/.ssh/id_rsa), connect on port 2222 (-p

2222), and log in as the admin user on server1.

Part 2: Setting File Permissions

The correct command to set the file permissions based on the screenshots would likely involve using

chmod. Here is the command to set permissions correctly:

chmod 600 ~/.ssh/id_rsa

This restricts the private key's permissions so that only the user can read and write it.

Part 3: Setting Ownership

If ownership needs to be set, the command would look like this:

chown comptia:comptia ~/.ssh/id_rsa

This command ensures that the file is owned by the correct user (comptia) and the correct group

(comptia).

In part 4, it asks you to select the proper file for editing to enable remote server access. Based on

standard SSH configuration requirements, the proper file to edit for remote server access would be

~/.ssh/config.

Here’s why:

~/.ssh/config: This file allows you to set up configuration options for different hosts, including

specifying ports, user names, and the identity file (private key). You would add the necessary

configuration for server1 to this file for easier access.

Other options:

~/.ssh/authorized_keys: This file lists public keys that are authorized to log in to the local system. It's

not meant for configuring remote access to another server.

~/.ssh/known_hosts: This file stores the host keys of servers you’ve connected to. It doesn’t allow for

editing remote access settings.

~/.ssh/server1: This seems like a private key file or another custom file, but it’s not typically used to

configure SSH options.

For configuring access to server1 on port 2222, you would add a block like this to the ~/.ssh/config

file:

Host server1

HostName server1

Port 2222

User admin

IdentityFile ~/.ssh/id_rsa

below.

Explanation:

yum install httpd

systemct1 --now enable httpd

systemct1 status httpd

netstat -tunlp | grep 80

pkill

systemct1 restart httpd

systemct1 status httpd

Production web servers should use certificates issued by trusted Certificate Authorities (CAs).

B is correct: This describes the proper process—generate a private key, create a CSR (Certificate

Signing Request), send it to a CA, and use the returned signed certificate for HTTPS.

Incorrect Options:

A: SSH keys are for SSH, not HTTPS/TLS.

C: Self-signed certs are insecure in production.

D: Irrelevant to HTTPS; /dev/random is used for entropy generation.

Reference:

CompTIA Linux+ XK0-005 Study Guide, Chapter 11

man openssl

The best commands to use to generate a list of rogue process names that have a TCP listener on a

network interface are

A. netstat -antp | grep LISTEN and

B. lsof -iTCP | grep LISTEN. These commands

will show the process ID (PID) and name of the processes that are listening on TCP ports, which can

be used to identify any suspicious or unauthorized processes. The other commands are either not

specific enough, not valid, or not relevant for this task. For example:

C . lsof -i:22 | grep TCP will only show the processes that are listening on port 22, which is typically

used for SSH, and not any other ports.

D . netstat -a | grep TCP will show all the TCP connections, both active and listening, but not the

process names or IDs.

E . nmap -p1-65535 | grep -i tcp will scan all the TCP ports on the local host, but not show the process

names or IDs.

F. nmap -sS 0.0.0.0/0 will perform a stealth scan on the entire internet, which is not only impractical,

but also illegal in some countries.

The correct sequence of commands to expand a volume group using a new disk is fdisk, pvcreate,

vgextend. The fdisk command can be used to create a partition on the new disk with the type 8e

(Linux LVM). The pvcreate command can be used to initialize the partition as a physical volume for

LVM. The vgextend command can be used to add the physical volume to an existing volume group.

The partprobe command can be used to inform the kernel about partition table changes, but it is not

necessary in this case. The vgcreate command can be used to create a new volume group, not

expand an existing one. The lvextend command can be used to extend a logical volume, not a volume

group. The lvcreate command can be used to create a new logical volume, not expand a volume

group. The mkfs command can be used to create a filesystem on a partition or a logical volume, not

expand a volume group. : CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 14:

Managing Disk Storage, pages 462-463.