Data Packets
Define data packets
It is the smallest unit of information
Give the three factors of the method of data transmission.
The direction of data transmission, the method of data transmission, the method of data synchronization
In an echo check, who checks the data if it is correct?
The sender is the one who will check the data, not the receiver, thus, getting the name 'echo' check.
Describe the different directions of data transmission
Simplex is one direction only, Half-duplex is both directions but not at the same time, Full-duplex is both directions at the same time.
List down all the error checking discussed in the book. The group who can list it all will have the points.
Parity Check (Byte and Block), Echo Check, Checksum, Check Digit ISBN-13, Check Digit Modulo 11, ARQ
Describe what is Symmetric Encryption
This type of encryption uses the same key to encrypt and decrypt texts.
Why do some data packets get lost during transmission? How do we solve it? State how this solution works.
Lost packets happened because of faulty connections between different routers. We can solve this using hopping wherein a max hop number is added in the header and get deducted by 1 when it leaves the router. It gets deleted once the hop number turns 0.
Describe the two methods of data transmission
Serial sends one bit at a time in a single wire. Parallel sends multiple bits at a time in several wires.
How does Modulo 11 works?
Modulo 11 works by multiplying each digit with its weight. Then add it all up and divide by 11. If the remainder is not 0 or 1, then it gets subtracted from 11.
How is asymmetric encryption different with symmetric encryption?
Asymmetric Encryption uses two different keys to encrypt and decrypt files called the public and private keys.
Describe packet switching
Packet switching is the transfer of small pieces of data across various networks. These data chunks or “packets” allow for faster, more efficient data transfer.
Give two advantages of USB-C compared to the older versions of USB
How does echo check work? Who checks the data if it is correct?
Echo check works by sending back the original data from the receiver to the sender. The original sender is the one who checks the data if it is correct.
True or false. Is it possible to get the original private key from a public key of that person?
No. It is impossible because the algorithms used in making a key-pair value is a trapdoor function, wherein, it is NOT easy to reverse the value back to its previous state.
Why is packet switching important?
It reduces interference, faster transmission of data, scalable, adaptive in terms of rerouting due to faulty connections,
Why does parallel transmission cause skewing?
It causes skewing because data does not arrive in order or data arrives unsynchronized
How does ISBN 13 works? State the steps.
1. Add all odd position numbers.
2. Then add all even positioned numbers and then multiply by three.
3. Add steps 1 and 2
4. Divide the sum from step 3 by 10.
5. If the remainder is not 0, then subtract the remainder from 10. That will be the check digit.
If the remainder is 0, then that is the check digit.
State the process of Asymmetric Encryption.
Answer varies.