network test install questions

install network test on fedora.

1.How to fix the “Cannot retrieve repository metadata (repomd.xml)” error in Fedora

• You need to edit two of your repository files: /etc/yum.repos.d/fedora.repo and /etc/yum.repos.d/fedora-updates.repo. Now un-comment all the lines that start with  the term baseurl and place a comment before all lines that start with mirrorlist. This should be done for both the above files.

• Now edit your /etc/hosts file and append the following to it's contents: 80.239.156.215 mirrors.fedoraproject.org
  213.129.242.84 mirrors.rpmfusion.org

2.install cu command
   yum install uucp

3. not able to use g++
  yum install gcc-c++

4.need to install yacc
  yum install yacc
5. how to set root user's password
  sudo passwd root
  then input root's passwd.
6.Can't locate ExtUtils/MakeMaker.pm in @INC
    yum install perl-ExtUtils-MakeMaker

7. can't find openssl/md5.h
  yum install openssl-devel