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  • Boot process
    • boot overview
    • grub2
    • kernel
    • systemd
    • root password recovery
    • Filesystem Hierarchy Standard
  • User admin
    • configuration files
    • user administration commands
    • setuid, setgid & sticky bit
    • su command
    • sudo command
    • Access Control Lists
    • Pluggable Authentication Modules
  • Storage
    • disk partitioning
    • ext4
    • xfs
    • LVM
    • swap
    • NFS & CIFS
    • automounter
    • storage commands
      • mount
      • query
        • ls
        • tree
        • du
        • df
        • file
        • ldd
        • stat
        • fuser
        • lslocks
      • search
        • find
        • locate
        • findfs
        • mountpoint
        • findmnt
        • namei
      • view and create
        • cat
        • tac
        • more
        • head
        • tail
        • touch
        • xfs_mkfile
        • fallocate
        • truncate
        • dd
        • ln
        • mkfifo
        • mknod
        • mktemp
        • mkdir
      • delete
        • rm
        • rmdir
        • unlink
        • shred
        • scrub
        • dd
      • attributes manipulation
        • chattr
        • lsattr
      • archival
        • tar
        • star
      • compression
        • compress
        • gzip
        • bzip2
      • other
        • rsync
        • blockdev
        • ssm
  • Network
    • Network configuration
      • configuration basics
      • bonding
      • teaming
      • bridging
      • VLANs
    • SSH
    • TCP wrappers
    • DNS client
    • VNC
    • LDAP client
    • time, chrony & ntp
      • timedatectl
      • date
      • hwclock
      • chrony
      • ntp
    • networking tools
      • ip
      • networkctl
      • netstat
      • ss
      • address resolution
        • nslookup
        • host
        • dig
      • host alive?
        • ping
        • hping3
        • nmap
      • tracing routes
        • traceroute
        • tracepath
      • packet sniffing
      • netcat
        • chat
        • banner grabbing
        • file transfer
        • port scanner
        • remote shell
        • security
        • other
      • messaging local users
  • Monitoring
    • Process monitoring
      • ps
      • top
      • htop
      • atop
      • prtstat
      • pidstat
      • prlimit
      • pmap
      • gstack
      • pstree
      • kill, pkill & killall
      • nice, renice & ionice
      • lsof
    • Process related
      • pgrep
      • bg, fg, &, jobs, nohup and disown
      • stty, tty, clear & reset
      • time, timeout, sleep & usleep
      • watch
      • strace
    • Performance monitoring
      • mpstat
      • vmstat
      • iostat
      • sar, sadc & sa1
      • netstat
      • slabtop
      • ipcs, ipcmk & ipcrm
    • User session monitoring
      • last, lastb & lslogins
      • id, logname, groups, users, w, who, whoami and who am i
  • Security
    • SSH security
    • tcp wrappers
    • iptables
    • firewalld
    • LUKS encrypted file systems
  • Miscellaneous
    • scheduling
      • cron & anacron
      • at & batch
    • logging
      • rsyslog
      • journal
      • logrotate
      • logger
      • dmesg
    • patching
      • rpm
      • yum
      • dnf
    • getting help
      • man
      • apropos
      • whatis, which & whereis
      • fc & history
      • locate
  • Cisco IOS
    • Routing
      • Static and floating routes
      • Dynamic Routing Protocols
      • RIP
      • EIGRP
      • OSPF
      • FHRP
    • IP services
      • Cisco DNS
      • Cisco NTP
      • Cisco DHCP
      • Cisco NAT
    • Cisco security
      • Cisco Security Fundamental Concepts
      • Configure console and remote access
      • Port security
      • Access Control Lists
      • DHCP snooping
      • Dynamic ARP inspection

IP services

IP services sections:

  • DNS
  • NTP
  • DHCP
  • NAT

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