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Linux Operation and Administration
Chapters 11-15
59
Computer Networking
Undergraduate 3
11/14/2013

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Term
Berkeley Internet Name Daemon (BIND)
Definition
Open-source software that contains all DNS protocols needed to resolve hostnames to IP addresses.
Term
caching
Definition
A DNS feature that stores DNS queries on the local site for fast hostname-to-IP address resolution
Term
Domain Name System (DNS)
Definition
A distributed and hierarchical database that allows controlling DNS management on the local site and is used to translate hostnames to IP addresses.
Term
forwarder
Definition
A type of DNS server that forwards unknown DNS requests generated on the local site to an off-site DNS server
Term
master name server
Definition
An authoritative name server that stores primary copies of zone records
Term
name server
Definition
A central database that translates hostnames to IP addresses (or IP addresses to hostnames)
Term
resource record
Definition
A file containing resource information or characteristics about a zone or domain.
Term
root DNS servers
Definition
DNS servers that control the to-top-level domains (TLDs) of the Internet
Term
slave name server
Definition
An authoritative name server that recieves its zone information from the master name server
Term
Start of Authority (SOA)
Definition
A mandatory resource record in a zone file that contains basic information about the zone
Term
time-to-live (TTL)
Definition
The amount of time a DNS server caches a resource record
Term
zone file
Definition
A text file that stores DNS zone data
Term
zones
Definition
Portions of the domain namespace
Term
Cyrus
Definition
A type of IMAP server designed to handle increased mail demands
Term
Internet Message Protocol (IMAP)
Definition
An advanced client/server protocol for recieving e-mail from a server; includes options for storing and organizing e-mails on the server
Term
mail transfer agent (MTA)
Definition
A program for sending and recieving messages between systems via SMTP
Term
mail user agent (MUA)
Definition
An e-mail application that users run to access their mailboxes and send and recieve e-mail
Term
Post Office Protocol 3 (POP3)
Definition
A standard client/server protocol for receiving e-mail
Term
procmail
Definition
A Linux utility used for filtering and sorting incoming e-mail
Term
Simple Mail Transfer Protocol (SMTP)
Definition
The TCP/IP protocol that defines how e-mail is sent across a network
Term
file server
Definition
A network system where users can store and share files
Term
mount
Definition
Making a file system appear as though it's on a local machine
Term
mount opoint
Definition
Typically an empty directory on the local file system that's used as a logical space to mount another file system
Term
Network File System (NFS)
Definition
A distributed file system protocol that allows remote access to shared resources across networks
Term
NFS server
Definition
A Linux machine on the network that exports directories to all network hosts that have access to it
Term
Remote Procedure Calls (RPC)
Definition
A protocol that allows one computer on a network to request a service from a program on another computer on the network
Term
subtree
Definition
A process the NFS server uses to check whether a requested file is in the exported subdirectory
Term
arithmetic logic unit (ALU)
Definition
A component of the CPU responsible for mathematical and logical operations
Term
Auto YaST profile
Definition
An ASCII XML configuration file used to configure an automatic openSuSE installation
Term
bus
Definition
A channel that allows you to connect components such as a video card to your computer's processor
Term
cache
Definition
A place where the CPU can store frequently accessed data and instructions
Term
clock speed
Definition
The number of pulses per second generated by the oscillator on the motherboard
Term
Control unit (CU)
Definition
A component of the CPU that regulates instructions
Term
dynamic TRAM (DRAM)
Definition
The most common type of memory used in computers; stores inforamtion by refreshing the capacitors thosuands of times per second
Term
extended partition
Definition
A primary partiton that contains a logical partition
Term
hard disk drive (HDD)
Definition
The main storage device; typically holds the largest amount of data in your computer
Term
Integrated Drive Electronics (IDE)
Definition
A type of interface that connects up to four hard drives via a flat 40-wire parallel cable or a seven-pin connector
Term
level 1 (L1) cache
Definition
The small RAM chip built into the CPU
Term
level 2 (L2) cache
Definition
A small RAM chip that's connected directly to the CPU or incorporated into processors. It's larger and slower than an L1 cache and is capable of reading larger quantities of data from RAM
Term
level 3 (L3) cache
Definition
A small RAM chip that's connected directly to the CPU when an L2 cache is used and is incorporated directly into the CPU in multicore precessores. Similar functionality as an L2 caceh but is even larger and slower.
Term
logical partition
Definition
A partition that's created in one of the four primary partitions; begins with the drive number 5
Term
multiplier
Definition
A number hard-wired into the CPU for determining processor speed
Term
Ppartitioning
Definition
The process of dividing a hard drive into logical sections; each one is a contijuos section of blocks treated as a separate physical dirve
Term
primary partitions
Definition
Partitions installed as apart of the Linux boot sector . Linuxs supports only four primary partitins, which can be subdivided further
Term
read-only memory (ROM)
Definition
Nonvolatile computer memory used to store data permamently
Term
resolution
Definition
The number of horizontal and vertical pixels a monitor is capable of displaying
Term
Serial Advanced Technology Attachment (SATA)
Definition
An advanced IDE interface for high performance and better reliability; it uses a much thinner cable, which simplifies cabling and improves airflow in the system
Term
small computer systems interface (SCSI)
Definition
An interface typically used to connect hard drives in a server rather than a home desktop; it's faster and more expensive and creates mor noise and heat than other types of hard disk interface
Term
static RAM (SRAM)
Definition
Memory capable of storing information without the need to refresh its capacitors, as long as there is power tot he computer
Term
swap partitions
Definition
Partitions on the HDD that the Linux kernal uses for storing pages from RAM
Term
video adapter cards
Definition
Expansion devices that plug into a bus on the motherboard; used to send graphical information to the monitor
Term
data mode
Definition
One of three journaling modes first inroduces in ext3. It's the slowest mode because it requires the file system to write every change twice: first to the journal and then tot he file system
Term
extents
Definition
In ext4, a set of contiguous physical blocks used to reduce fragmentation and improve performance
Term
Fourth Extended (ext4) File System
Definition
A jouranling file system included with openSuSE Linux that offers better performance and increased reliability along with several new features, including unlimited subdirectories, extents, and multiblock alloaction
Term
journaling
Definition
A Linux file system feature that cahes data in a hidden file until the kernal writes it to the hard drive
Term
logical volume management (LVM)
Definition
A technique for collecting information on free space from all disk partitions and storage devices into one logical volume
Term
ordered mode
Definition
The default journaling mode, first introduced in ext3. It stores metadata, but it writed data first, which is important to prevent data corruption
Term
Second Extended (ext2) File System
Definition
A replacement for the extended file system that doesn't support journaling. Features include support for standard UNIX file types, larger partition sizes, variable-length filenames up to 255 character, and reservation of blocks for root
Term
Third Extended (ext3) File System
Definition
A Linux file system that supports journaling and a maximum file size of 2 TB
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