Avocent Network Device SPC420 - Manual (Page 413)

Appendices 393
DSView 3 software hub server
A DSView 3 software hub server is responsible for maintaining the master copy of the
DSView 3 software system database. Only one server in a DSView 3 software system can be
configured as the hub server. Spoke servers in a DSView 3 software system perform database
replication with the hub server. The DSView 3 software hub server acts as the traffic cop for
database replication between itself and all of the other servers in a DSView 3 software system.
The DSView 3 software hub server and a spoke server offer the same software functionality to
a user. The distinction of hub or spoke only has to do with the database replication role the
server plays and not with the software functionality the server offers to the user.
The DSView 3 management software versions of the spoke server and hub server must match
in order to register the spoke server. For example, you may not register a spoke server running
DSView 3 version 3.1 with a hub server running DSView 3 software version 3.2.
DSView 3 software spoke server
A DSView 3 software spoke server is responsible for initiating database replication with the
hub server. A spoke server sends its database changes to the hub server and receives database
changes from it.
The DSView 3 software hub server and a spoke server offer the same software functionality to
a user. The distinction of hub or spoke only has to do with the database replication role the
server plays and not with the software functionality the server offers to the user.
The DSView 3 management software versions of the spoke server and hub server must match
in order to register the spoke server. For example, you may not register a spoke server running
DSView 3 software version 3.1 with a hub server running DSView 3 software version 3.2.
DSView 3 software system
A DSView 3 software system includes all the components required to provide DSView 3
software functionality, including the DSView 3 server, DSView 3 software client, managed
appliances and target devices.
An SNMP manager and external authentication servers, which are optional components and
outside the DSView 3 software system, may also be added to provide additional functionality.
Embedded appliance
Embedded appliances include IBM ASM RSA II, DRAC 4, HP iLO and NEC IPF embedded
appliances.
Encryption
Encryption is the translation of data into a secret code. Encryption is the most effective way to
achieve data security. To read an encrypted file, you must have access to a secret key or
password that enables you to decrypt the file. Unencrypted data is called plain text. Encrypted
data is referred to as cipher text.
There are two main types of encryption: asymmetric (also called public-key encryption) and
symmetric.