Error Detection and Correction - 1
Error Detection and Correction - 1
Questions
Which of the following uses the same path from source to destination for each packet of a message?
- Circuit switching
- Message switching
- Virtual approach to packet switching
- Datagram approach to packet switching
Which of the following defines establishment and release of data links, data receipt confirmation methods and error control in computer network?
- Basic control procedure
- Non-procedure
- HDLC procedure
- Protocol
- Protocol stack
Which of the following control codes represents the change in the meaning of subsequent specific number of successive characters in a computer network?
- SOH
- DLE
- STX
- EOT
- ETX
Which of the following statements is a characteristic of point-to-point connection?
- It provides a common link used by all the devices.
- It cannot be used for microwave or satellite connections.
- Its capacity of channel is reserved.
- Its capacity of channel is shared.
- It is a time-shared connection.
What is half-duplex mode?
- It is half part of a network.
- The sender can transmit only in one direction always.
- The stations can both transmit and receive but not at the same time.
- The sender can transmit in both directions at the same time.
- Both 1 and 3.
What are peering points?
- They are the points of connection between two devices.
- They are the networks connected by switching stations.
- ISP networks are connected to each other by private switching stations called peering points.
- ISP networks are connected to each other by public switching stations called peering points.
- Peering points provide connectivity between end users.
In which of the following is 1 bit encoded as a zero voltage and the 0 bit is encoded as alternative positive and negative voltages?
- Polar schemes
- Unipolar schemes
- Return to zero
- Pseudoternary
- Alternate mark inversion
What do you mean by framing?
- Data link layer divides the stream of bits in manageable data units.
- It is the rate at which data is transmitted.
- It is the conversion of bits into analog signal.
- It is the addition of a header to the data.
- It is the addition of a trailer to the data.
A 1250 byte transmission unit carried on the wire over the network is the result of sending a message with a protocol stack with DNS, UDP, IP, PPP, and SONET. Each protocol header is 20 bytes long. What percentage of the network bandwidth on the wire is spent carrying the message data?
- 92.6
- 93
- 92
- 8
- 7.4
How many parity bits are required to devise a single bit error correcting hamming code for a 16-bit data string?
- 2
- 3
- 4
- 5
In which year was the international ADSL standard approved?
- 1989
- 1998
- 1999
- 2000
If a noiseless 5 MHz channel is using four level digital signals, then what is the maximum data rate?
- 15 Mbps
- 17 Mbps
- 20 Mbps
- 25 Mbps
How many bytes are required for CRC in the AAL5 frame?
- 2 bytes
- 4 bytes
- 6 bytes
- 8 bytes
What are the two versions of ALOHA?
- Soft and hard
- Pure and impure
- Pure and slotted
- Linear and nonlinear
What is the probability of an n-bit frame being received correctly, if any bit being in error is p?
- n-p
- p-n
- 1-p
- (1-p)n
What will you get after encoding an 8-bit binary value 10101111, using even parity hamming code?
- 101101001111
- 111001001111
- 001001001111
- 101001001111