Answer:
A 1 MB digital file needs 0.23 seconds to transfer over a channel with bandwidth 10 MHz and SNR 10 dB.
Explanation:
We can calculate the channel capacity using Shannon's Capacity formula:
C = B + log₂ (1 + SNR)
Where C = Channel Capacity
B = Bandwidth of the Channel
SNR = Signal to Noise Ratio
We are given SNR in dB so we need to convert it into a ratio.
= 10log₁₀ (SNR)
10 = 10log₁₀ (SNR)
1 = log₁₀ (SNR)
SNR = 10¹
SNR = 10
So, using Shannon Channel Capacity formula:
C = 10 x 10⁶ log₂ (1 + 10)
C = 34.5 MHz
Total amount of time required to transmit a 1MB file:
1MB = 1 x 8 Mbytes = 8Mb
C = 34.5 MHz = 34.5 Mb/s
Time required = 8Mb/34.5Mb/s = 0.23 seconds
A 1 MB digital file needs 0.23 seconds to transfer over a channel with bandwidth 10 MHz and SNR 10 dB.
Answer:
In the case of generic software development, the developer has the control of all the decisions while with custom software development, the client is responsible of the decisions about the characteristics of the software.
This means for users of generic software products that they don't have control over the product.
Explanation:
-A generic software development refers to the creation of a product by a software development organization that will own it and sell it to customers. This software is created for the open market and is designed to solve a problem for many customers.
-A custom software development refers to the creation of a product by a software development organization for a client. This product is created according to the customer's needs and specifications in order to solve a specific problem of the client.
Answer:
a. Encryption.
b. Authentication.
c. Strong.
d. Rogue.
e. Insecure.
f. Hacking.
Explanation:
In Computer technology, authentication can be defined as the process of verifying the identity of an individual or electronic device. Authentication work based on the principle (framework) of matching an incoming request from a user or electronic device to a set of uniquely defined credentials.
Basically, authentication ensures a user is truly who he or she claims to be, as well as confirm that an electronic device is valid through the process of verification.
Encryption is a form of cryptography and typically involves the process of converting or encoding informations in plaintext into a code, known as a ciphertext. Once, an information or data has been encrypted it can only be accessed and deciphered by an authorized user.
Some examples of encryption algorithms are 3DES, AES, RC4, RC5, and RSA.
Wireless networks have no clear boundaries, therefore securing communications requires strong encryption, authentication, and strong protocols. One of the most common wireless security threats is the presence of rogue access points (APs). Rogue points can be set up for the benign purpose of free wireless access or for malicious purposes, such as gaining access to confidential data. Using an insecure wireless hotspot, like so many found in public settings, leaves you vulnerable to become the victim of hacking.
