205 Networking Configuration

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205.1 Basic networking configuration

Weight 3

Candidates should be able to configure a network device to be able to connect to a local, wired or wireless, and a wide-area network. This objective includes being able to communicate between various subnets within a single network.

Key Knowledge Areas

   * Utilities to configure and manipulate ethernet network interfaces
   * Configuring wireless networks 
EXTIF=eth0
iptables -t nat -A POSTROUTING -o $EXTIF -j MASQUERADE

/sbin/route

/sbin/ifconfig

/sbin/ip

ip route get 23.6.118.140

/usr/sbin/arp

/sbin/iwconfig

205.2 Advanced Network Configuration and Troubleshooting

Weight 4

Candidates should be able to configure a network device to implement various network authentication schemes. This objective includes configuring a multi-homed network device, configuring a VPN client and resolving communication problems.

Key Knowledge Areas

   * Utilities to manipulate routing tables
   * Utilities to configure and manipulate ethernet network interfaces
   * Utilities to analyse the status of the network devices
   * Utilities to monitor and analyse the TCP/IP traffic
   * OpenVPN 

/sbin/route

/sbin/ifconfig

/bin/netstat

/bin/ping

/usr/sbin/arp

/usr/sbin/tcpdump

/usr/sbin/lsof

/usr/bin/nc

/sbin/ip

/etc/openvpn/*

openvpn

nmap

wireshark

205.3 Troubleshooting network issues

Weight 5

Candidates should be able to identify and correct common network setup issues, to include knowledge of locations for basic configuration files and commands.

Key Knowledge Areas

   * Location and content of access restriction files
   * Utilities to configure and manipulate ethernet network interfaces
   * Utilities to manage routing tables
   * Utilities to list network states.
   * Utilities to gain information about the network configuration
   * Methods of information about the recognised and used hardware devices
   * System initialisation files and their contents (SysV init process) 

/sbin/ifconfig

/sbin/route

/bin/netstat

/etc/network || /etc/sysconfig/network-scripts/

System log files such as /var/log/syslog & /var/log/messages

/bin/ping

/etc/resolv.conf

/etc/hosts

/etc/hosts.allow & /etc/hosts.deny

/etc/hostname | /etc/HOSTNAME

/bin/hostname

/usr/sbin/traceroute

/usr/bin/dig

/bin/dmesg

/usr/bin/host

205.4 Notify users on system-related issues

Weight 1

Candidates should be able to notify the users about current issues related to the system.

Key Knowledge Areas

   * Automate communication with users through logon messages.
   * Inform active users of system maintenance 

/etc/issue

/etc/issue.net

/etc/motd

wall

/sbin/shutdown