CompTIA Updated XK0-005 Exam Questions and Answers by cairo

Users are reporting that a production application has slow performance. A systems administrator logs in to the server and performs some basic checks. Given the following:

yaml

[root@comptia]# ps -o pcpu; pidstat 1

Average: UID PID %usr %system %wait %CPU Command

Average: 0 937242 32.39 0 63.21 32.39 app_prd

Average: 0 937245 44.97 0.31 51.57 45.28 app_prd

Average: 0 937244 23.62 0 63.55 28.62 app_prd

[root@comptia]# vmstat 1

procs memory swap io system cpu

r b swpd free buff cache si so bi bo in cs us sy id wa st

16 0 978912 376320 50804 10296312 0 0 0 44 5503 2962 98 2 0 0 0

[root@comptia]# free -m

total used free shared buff/cache available

Mem: 15533 5063 365 164 10104 9975

Swap: 7931 955 6976

Which of the following is causing the performance issue?

A Linux user is trying to execute commands with sudo but is receiving the following error:

$ sudo visudo

>>> /etc/sudoers: syntax error near line 28 <<<

sudo: parse error in /etc/sudoers near line 28

sudo: no valid sudoers sources found, quitting

The following output is provided:

# grep root /etc/shadow

root :* LOCK *: 14600 ::::::

Which of the following actions will resolve this issue?

A Linux administrator is troubleshooting an SSHD issue on a server. Users are receiving error messages stating the connection is refused. Which of the following commands should be used to verify whether the service is listening?

# curl https://www.comptia.org

curl: (7) Failed to connect to www.comptia.org port 443: No route to host

The administrator logs in to the company’s web server to check its configuration and sees the following output:

root@comptia.org:-># firewall-cmd --list-all

public (active)

target: default

icmp-block-inversion: no

interfaces: dummy0 eth0

sources:

services: cockpit dhcpv6-client http ssh

ports: 3001/tcp

protocols:

forward: no

masquerade: no

forward-ports:

source-ports:

icmp-blocks:

rich rules:

rule family="ipv4" source address="61.177.173.6" port port="ssh" protocol="tcp" reject type="icmp-port-unreachable"

rule family="ipv4" source address="185.143.45.164" port port="ssh" protocol="tcp" reject type="icmp-port-unreachable"

rule family="ipv4" source address="143.198.60.41" port port="ssh" protocol="tcp" reject type="icmp-port-unreachable"

root@comptia.org:-># ip route

default via 172.31.1.1 dev eth0 proto dhcp src 65.21.187.65 metric 100

10.0.6.0/24 dev dummy0 proto kernel scope link src 10.0.6.65 metric 550

172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1

172.18.0.0/16 dev br-28ac2eaeeca1 proto kernel scope link src 172.18.0.1

172.19.0.0/16 dev br-fb3897555ca3 proto kernel scope link src 172.19.0.1 linkdown

172.31.1.1 dev eth0 proto dhcp scope link src 65.21.187.65 metric 100

192.168.224.0/20 dev br-e949ab177d79 proto kernel scope link src 192.168.224.1 linkdown

192.168.240.0/20 dev br-6adf72ac0ae3 proto kernel scope link src 192.168.240.1 linkdown

Which of the following is causing the issue?