network configuration
in-depth look at the network configuration files
SSH
in-depth look at the SSH configuration files, options, security best practices, etc
TCP wrappers
configuration of /etc/hosts.allow & /etc/hosts.deny for added security
DNS client
configuration of /etc/resolv.conf for DNS resolution
VNC
configuration of Virtual Network Computer remote desktop sessions
LDAP
simple configuration of an LDAP client
time, chrony & ntp
date & time extraction/modification with timedatectl, date & hwclock and time synchronisation with chronyd & ntpd
ip command
in-depth look at ip address, link & route
netstat command
in-depth look at netstat and overview of its replacement ss
address resolution
in-depth look at nslookup, host, dig, arping & whois
host alive?
in-depth look at ping, ping6 & hping3
tracing routes
in-depth look at traceroute, tracepath & tracepath6
packet sniffing
in-depth look at tcpdump
swiss army knife
in-depth look at netcat
messaging local users
in-depth look at wall