Cisco Network Boot Installation and Configuration Guide, Release 2.1
Glossary
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Glossary

Table Of Contents


Glossary


B
 
BIOS
A relatively small program that resides in memory on a personal computer that is responsible for booting that computer and performing certain operations.
boot image
An instance of an operating system and application programs for a host. With Cisco Network Boot, a boot image also contains a Cisco iSCSI driver, network drivers, and the network configuration necessary to complete the network connection. A boot image resides on an iSCSI target/LUN zero from which a host boots. See also master boot host.


C
 
Cisco Network Boot
A Cisco software product that allows a diskless computer to boot from an iSCSI target via a Cisco SN 5400 Series system.
Cisco SN 5400 Series system
The phrase used when referring to all models of the Cisco SN 5400 Series product; when used, it includes the SN 5420, SN 5428, and other product models that will be available.


D
 
DHCP
A protocol that provides a mechanism for allocating IP addresses dynamically so that addresses can be reused when hosts no longer need them.
diskless
Referring to a computer that has no disk drive or any other storage device.
diskless boot
A process the computer goes through to boot without a disk drive. This process is usually through a network card and the computer obtains its boot image across the network.
Dynamic Host Configuration Protocol
See DHCP.


F
 
firmware

Low-level software for booting and operating an intelligent device. Firmware generally resides in read-only memory (ROM) on the device.



H
 
hardware ethernet address

See MAC address.

host

See IP host. See also master boot host.



I
 
inbp.com
The software program that allows a computer to boot without a disk directly attached to the computer. The inbp.com program runs as a Network Bootstrap Program (NBP) in the Preboot Execution Environment (PXE). The program is stored on a TFTP server for downloading to a computer that is configured to boot from the network.
Internet Small Computer System Interface
See iSCSI.
IP host
A computer system on an IP network. Each host uses Cisco Network Boot to boot from an iSCSI target on a Cisco SN 5400 Series system. Each IP host requires an iSCSI target/LUN zero with a boot image for that host. See also master boot host.
iSCSI
(Internet Small Computer System Interface) Referring to an IETF-defined protocol for IP storage (ips). For more information about the iSCSI protocol, refer to the IETF standards for IP storage at http://www.ietf.org.
iSCSI driver
The Cisco iSCSI driver for Microsoft Windows 2000 provides an IP host with the ability to access storage through an IP network. The iSCSI driver uses iSCSI protocol to transport SCSI requests and responses over an IP network between the IP host and a Cisco SN 5400 Series system. (The iSCSI protocol is an IETF-defined protocol for IP storage.)
iSCSI target

A logical representation of a Fibre Channel storage device (or devices) that is connected to a Cisco SN 5400 Series system. An iSCSI target is configured with one or more accompanying iSCSI LUNs on a Cisco SN 5400 Series system. With Cisco Network Boot, an IP host accesses a boot image contained on the Fibre Channel storage device mapped as the iSCSI target LUN zero.



L
 
LUN
(Logical Unit Number) A SCSI identifier within a target assigned to each Fibre Channel accessible disk so that the host can address and access the data on those devices.


M
 
MAC address

A standardized data link layer address that is required for every port or device that connects to a LAN. Other devices in the network use these address to locate specific ports in the network and to create and update routing tables and data structures. MAC addresses are 6 bytes long and are controlled by IEEE.

mapping
Conversion or connection between two data addressing spaces.
master boot host
A host with a directly attached disk drive. The purpose of the master boot host is to create a master boot image. The master boot image is a source for replicating boot images for other hosts. See also IP host.
master boot image
A boot image that is created initially on the disk drive located on a master boot host. All other boot images within the iSCSI targets are replicated directly or indirectly from this boot image. See also boot image.


N
 
Network Boot Administration Utility
A component in Cisco Network Boot that allows a user to perform Cisco Network Boot administrative tasks, including boot image replication.
network interface card
A board that provides network communication capabilities to and from a computer system.
NIC
See network interface card.


P
 
partition
A subdivision of the capacity of a disk. Partitions are consecutively numbered ranges of blocks that are recognized by MS-DOS, Windows, and most UNIX operating systems.
PXE

Pre-Boot eXecution Environment (PXE) architecture for booting a client computer. This is an Intel standard and lies within the system BIOS of a computer. Cisco Network boot uses this architecture for the booting process.



R
 
replicate
(noun) A general term for a copy of a collection of data. (verb) The action of making a replicate. It can also mean duplicate or copy.
reservation
In DHCP, a method of assigning static IP addresses to a client.
ROM

Read-Only memory



S
 
scope
In DHCP, an administrative grouping of computers running the DHCP Client service. You create a scope for each subnet on the network to define parameters for that subnet.
storage array
A group of disk drives that collectively acts as a single storage system. Two types of storage arrays are available: RAID (Redundant Array of Independent Disks) and JBOD (Just a Bunch Of Disks). A RAID system provides fault tolerance by storing the same data redundantly on multiple disks, but appears as a single disk. A JBOD is, typically, a group of individual disks cabled together in a chassis with redundant power and possibly some maintenance capabilities.
SCSI routing instance
A virtual router on the Cisco SN 5400 Series system.


T
 
TFTP
A service provided by a server daemon.
Trivial File Transfer Protocol
See TFTP.