Data communication system is referred to the exchange of information between the sender and receiver by use of transmission media.
The data communication system is referred to as the exchange of information between the sender and receiver by the use of transmission media.
some application of data communication system are;
In the data communication system, one information is transferred is transmission circuit then the media transfer the information to the receiver into the desired format.
the main issue is:
- data privacy
- cost of implementation
- use of the system for personal used during working hour
Which type of network medium is used by an integrated services digital network adapter?
A manufacturing company subscribes to certain hosted services from its ISP. The services that are required include hosted world wide web, file transfer, and e-mail. Which protocols represent these three key applications? (Choose three.)a. FTPb. HTTPc. DNSd. SNMPe. DHCPf. SMTP
Answer: the following options that supports the three key applications are a.FTP, b. HTTP and f. SMTP
A security analyst discovered data such as images and word documents hidden within different types of files.Which of the following cryptographic concepts describes what was discovered? A. Symmetric encryption
Steganography is a cryptographic concept used for describing data hidden in or within another data with the major purpose of avoiding detection. Any type of data can be hidden in another. The data could be an image, a text, a video or an audio file.
In steganography, two material media are involved: the message and the carrier. The message or data to be hidden is called the message while the data in which it is hidden is called the carrier.
Steganography refers to covering or hiding information or secret message.
This message is embedded or hidden in a file. This file can be an audio, a text file or an image or video file.
By hiding the messages and sending them this way protects the data and makes the existence of the hidden message undetectable.
It is different from cryptography because it does not change the meaning of the message, it just hides or covers it. The encrypted message can make an attacker suspicious that the real messages is encrypted but in steganography the existence of the secret data is hidden and hence cannot be easily detected.
For example embedding data in an image file like in digital pictures using steganography, encoding the message within an image pixels. This will not do major changes to the image but just changes the value of some of the pixels.
Who should have a career portfolio, and how often should it be updated?