Two-Minute Drill


Here are some of the key points from the certification objectives in Chapter 1.

Basic Hardware Knowledge

  

The Red Hat exams are given on computers built for an Intel-based 32-bit architecture.

  

An Intel-architecture PC has three basic communications channels: IRQ ports, I/O addresses, and DMA channels.

  

The latest version of Red Hat Enterprise Linux as certified should have at least 256MB of RAM.

  

You can set up Linux on IDE, SCSI, USB, or IEEE 1394 hard drives. However, the BIOS of a PC can load Linux boot files only from the first two PATA, SATA, or SCSI drives.

Basic Linux Knowledge

  

Linux is managed through a series of text configuration files.

  

Understanding text editors is a critical skill. If you ever have to recover your system with a rescue CD, you may not have access to the GUI and will need to know how to use a console-based text editor such as vi.

Linux Filesystem Hierarchy and Structure

  

Linux directories are organized to the Filesystem Hierarchy Standard (FHS).

  

In the FHS, devices such as mice and hard drives are grouped in the /dev directory. Some /dev files have logical names such as dvdwriter and are linked to the actual device files.

  

FHS partitions can be managed and formatted with the fdisk, fsck, and mkfs commands.

  

The Logical Volume Manager allows you to consolidate multiple partitions in one filesystem, on one directory.

  

Once configured, Linux directories can be mounted on a partition through /etc/fstab or directly with the mount command.

Basic File Operations and Manipulation

  

Linux administrators need to know how to use the command line interface.

  

Basic commands allow you to navigate, find the files that you need, read file contents, create new files, and more.

  

File filters allow you to search through the files themselves for specific citations or other file characteristics.

  

Administrative commands allow you to manage Linux in a number of ways, including running processes and managing logged-in users.

Printing

  

The default Red Hat Enterprise Linux print system is CUPS.

  

You can configure printers by directly editing the files in the /etc/cups directory or by opening the Red Hat Printer Configuration tool with the system-config-printer command.

Shells

  

Command lines are based on a shell.

  

With the right permissions, you can set up shell programs in executable scripts.

  

The way a shell works depends on the settings in its variables and parameters. Some variables and parameters are grouped in the inherited environment, which maintains settings from shell to shell.

  

With stdin, stdout, and stderr, you can manage different data streams.

Basic Security

  

Basic security within Linux is based on file permissions, users, groups, and umask.

  

The SUID and SGID bits allow you to share owner-level permissions with different users and groups.

  

Shadow passwords hide user authentication data. The Shadow Password Suite protects user and group passwords in files that should be accessible only to the root user.

System Administration

  

While it's normally best to log in as a regular user, it's faster to log in as the root user for the RHCE and RHCT exams.

  

Standard files for new users are kept in /etc/skel.

  

Daemons are processes that run in the background.

  

Network service can be controlled through scripts in the /etc/init.d and /etc/ xinetd.d directories.

  

The cron daemon helps you schedule different jobs, including backup and restore jobs, which should be done when network use is at a minimum.

  

When you have problems, system log files, as organized by /etc/syslog.conf, provide important clues to the causes.

Basic TCP/IP Networking

  

Most of the work in TCP/IP networking is in configuring IP addresses.

  

There are three different sets of private IPv4 addresses suitable for setting up TCP/IP on a LAN.

  

IPv6 addresses include all available IPv4 addresses. If the first three bits of an IPv6 address are 001, that is a unicast address-in other words, one that is associated with a specific computer or other device.

  

The first 48 bits of an IPv6 address are typically associated with a specific network.

  

Tools such as ping, ping6, ifconfig, and netstat can help you diagnose problems on that LAN.

  

Name resolution configuration files determine how your computer finds the right IP address.

Familiarity with Standard Network Services

  

There are a number of standard network services, including NFS, sendmail, POP, IMAP, FTP, DNS, DHCP, Samba, Apache, and NIS.

  

Each of these services, when installed, can be configured to start and stop through the scripts located in the /etc/rc.d/init.d or /etc/xinetd.d directories.

Basic Network Security

  

Basic network security settings can depend on allowing or denying access to different computers by their IP addresses or by the desired TCP/IP port.

  

Computers behind a firewall can be protected through Network Address Translation or various iptables commands.

Other Basic Prerequisite Skills per the Red Hat Exam Prep Guide

  

While GUI e-mail clients should be trivial, it's important to know how to configure a command line e-mail client.

  

While GUI Web browsers should be trivial for serious Red Hat exam candidates, it can help to know a text-based browser such as elinks.

  

While GUI FTP clients should be trivial for serious Red Hat exam candidates, it can help to understand a text-based FTP client such as lftp.

Downloading the Red Hat Enterprise Linux Installation CDs

  

There is no evidence that you need to know how to download the Red Hat installation CDs for the Red Hat exams.

  

While the best option is to download the RHEL 5 CDs from the Red Hat Network, excellent options are available.

  

You can use the rebuild distributions to prepare for the Red Hat exams. Their distributions are built on the same source code used by Red Hat for RHEL 5.



RHCE Red Hat Certified Engineer Linux Study Guide (Exam RH302)
Linux Patch Management: Keeping Linux Systems Up To Date
ISBN: 0132366754
EAN: 2147483647
Year: 2004
Pages: 227
Authors: Michael Jang

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