OpenSSL: Symmetric Encryption Algorithms & Examples

Posted by on Feb 8, 2025 in Computing and Communications | 0 comments

Symmetric Encryption Algorithms with OpenSSL

Encrypt the file “fichero.txt” using the RC4 symmetric encryption algorithm

OpenSSL> rc4 -in c:\cifrado\fichero.txt -out c:\cifrado\cifrado.rc4
enter rc4 encryption password:
Verifying - enter rc4 encryption password:

Decrypt the previous file:

OpenSSL> rc4 -d -in c:\cifrado\cifrado.rc4 -out c:\cifrado\descifrado.txt
enter rc4 decrypt password:

DES

Encrypt:

OpenSSL> des -salt -in c:\csb.log -out c:\csb.bf.txt
enter des-cbc encryption password:
Verifying
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Oracle DBMS Architecture: Key Concepts

Posted by on Feb 7, 2025 in Computing and Communications | 0 comments

Init.ora Configuration

The init.ora file is an archive of initialization values used to start an Oracle instance and establish configurations. It uses default values to optimize performance and resource allocation. This file sets all the parameters for Oracle to function correctly. There will be as many configuration files as there are active instances in the information system.

Control Files

Control Files are a set of small, stable files responsible for maintaining the consistency of the other files

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Veeam Backup & Replication: Key Concepts and Configurations

Posted by on Feb 2, 2025 in Computing and Communications | 0 comments

Veeam Backup & Replication: Key Concepts

Backup Job Configuration:

  • A Backup Administrator configures a copy job. Options include: One backup file per VM, or one backup file for all backup jobs.
  • A Backup Administrator has restored a VM. The recovery process should be: Migrate to production.
  • If a backup job is started while another is running, the backup job will fail immediately.
  • The most appropriate setting for backup jobs is to run continuously.
  • A Backup Administrator must perform a level of recovery.
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Network Design, Security, and Backup Solutions

Posted by on Feb 2, 2025 in Computing and Communications | 0 comments

Network Design and Implementation

I like the final network design. I went over the physical plan with Don Carson last week.

UPS Placement

By the way, where are you placing the UPS? In the IT closet, with the fireproof safe.

Cabling: Cat 6 vs. Fiber Optic

Did you decide on Cat 6 or Cat 5e cable? Cat 6. Don Carson suggested fiber optic, too. Cat 6 is fine. Fiber optic is too expensive. Agreed. Cat 6 is the best cable with a good price.

Data Backup Strategy

Sara, I think we should keep backup tapes offsite.

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SAP NetWeaver and ECC: Key Concepts and Administration

Posted by on Feb 2, 2025 in Computing and Communications | 0 comments

Question 1: Oracle Database Index Types

Oracle Database offers different types of indexes. Which are valid index types? (Choose two.)

  • A. Bitmap index.
  • D. Balanced tree (B*tree) index.

Question 2: SAP Spool System and TemSe Object

Regarding the object, TemSe, of the SAP spool system, which of the following statements are correct? (Choose two.)

  • A. TemSe stores, for example, spool data.
  • C. The instance parameter “rspo/store_location” determines where TemSe data is stored.

Question 3: SLD Registration Tools

Which

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Java Class for Customer Management

Posted by on Jan 31, 2025 in Computing and Communications | 0 comments

Java Class for Customer Management

This code defines a Java class named ClientesSC designed to manage customer data, including their names, ID numbers (DNI), phone numbers, and debts.

Class Attributes

  • ArrayList<ClientesSC> aprobar: Stores instances of ClientesSC.
  • Scanner src: Used for reading input from the console.
  • String nombre: Stores the customer’s name.
  • String dni: Stores the customer’s ID number (DNI).
  • int tlf: Stores the customer’s phone number.
  • int deuda: Stores the customer’s debt.

Constructors

  • ClientesSC(
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