Linux-2 Quiz 4 - ntp

NTP runs on which port?

• 123 tcp

• 123 UDP

• 312 tcp

• 312 UDP

How can I check if NTP daemon is running? Choose 2.

• ps aux | grep ntpd

• service status NTP

• pchk NTPD

• systemctl status ntp

How can I check if ntp is synced?

• ntp - status

• date

• ntpq -p

• ntp -q

Correct command to allow all TCP and UDP connections on IP 207.46.232.182 IP for port 22.

• sudo ufw 207.46.232.182:22 allow

• sudo ufw allow from 207.46.232.182 to any port 22

• sudo ufw 207.46.232.182 port 22 allow

• sudo ufw allow ip 207.46.232.182 using port 22

how to allow all UDP connections (incoming and outgoing) on port 123

• sudo ufw allow 123/udp

• sudo ufw allow port 123 proto udp

• sudo ufw open port=123 proto=udp

• sudo ufw enable port 123 proto udp

When using 'top' to check system resources, processes and CPU-usage: How to check the CPU-load per CPU on a multi-processor machines?

• press the 'c' key

• press the '1' key

• press the 'm' key

• this is not possible in TOP, install and use HTOP

on a Red Hat (RHEL) system, what command is used to query, add and remove firewall-rules

• firewalld

• ufw

• firewall-cmd

• ip tables

how to view a logfile in realtime, to debug a problem by viewing a logfile with a running application

• tail -f <Logfile>

• cat -f <Logfile>

• zcat <Logfile>

• logview <Logfile>

what is the correct UFW command to remove the FW-rule for all port 22 TCP traffic

• sudo ufw remove 22/tcp

• sudo ufw delete port 22 proto tcp

• sudo ufw remove port 22 proto tcp

• sudo ufw delete allow 22/tcp

What is true about logging deamons (more answers can be correct)

• The sysklogd and rsyslogd daemon provides logging facilities for applications and programs

• The klogd daemon provides logging facilities for the Linux kernel

• Dmesg is used for kernel ring logging

• The sysklogd daemon can only log to /var/log/ (or subdirectories under /var/log)