How would one choose the optional packages in an groupinstall?

edit

I have a group I want to install.

Does this install the optional packages as well?

sudo yum groupinstall "Network Servers"

Optional packages:

~ $ sudo yum groups info "Network Servers"
Loaded plugins: auto-update-debuginfo, fastestmirror, langpacks, protectbase,
              : refresh-packagekit, remove-with-leaves, upgrade-helper, versionlock
Loading mirror speeds from cached hostfile
 * fedora: www.fedora.is
 * fedora-debuginfo: www.fedora.is
 * rpmfusion-free: mirror.nl.leaseweb.net
 * rpmfusion-free-debuginfo: mirror.nl.leaseweb.net
 * rpmfusion-free-updates: mirror.nl.leaseweb.net
 * rpmfusion-free-updates-debuginfo: mirror.nl.leaseweb.net
 * rpmfusion-nonfree: mirror.nl.leaseweb.net
 * rpmfusion-nonfree-debuginfo: mirror.nl.leaseweb.net
 * rpmfusion-nonfree-updates: mirror.nl.leaseweb.net
 * rpmfusion-nonfree-updates-debuginfo: mirror.nl.leaseweb.net
 * updates: www.fedora.is
 * updates-debuginfo: www.fedora.is
0 packages excluded due to repository protections

Group: Network Servers
 Group-Id: network-server
 Description: These packages include network-based servers such as DHCP, Kerberos and NIS.
 Optional Packages:
   389-ds-base
   ahcpd
   amanda-server
   babeld
   cobbler
   dhcp
   dnsmasq
   ejabberd
   flumotion
   freenx-server
   freeradius
   fwknop
   icecast
   ipxripd
   jabberd
   kannel
   koan
   krb5-server
   libreswan
   netatalk
   nsd
   oidentd
   openldap-servers
   polipo
   privoxy
   puppet-server
   quagga
   radvd
   rinetd
   sobby
   tigervnc-server
   torque-server
   ucarp
   vnc-reflector
   vtun
   xl2tpd
   ypserv
   znc