Is TCP A GO BACK N or a selective repeat protocol?
Is TCP A GO BACK N or a selective repeat protocol?
TCP is similar to selective repeat because, when packets are lost due to congestion, the protocols do not require the sender to retransmit EVERY unACK’d packet sent by the sender. The sender just retransmits the oldest unACK’d packet.
Why do data link layer protocols need framing?
Framing is a function of the data link layer. It provides a way for a sender to transmit a set of bits that are meaningful to the receiver. Ethernet, token ring, frame relay, and other data link layer technologies have their own frame structures.
What is the main short coming of the stop and wait algorithm for error recovery?
Shortcoming The main shortcoming of the stop-and-wait algorithm is that it allows the sender to have only one outstanding frame on the link at a time. The sender should wait till it gets an ACK of previous frame before it sends next frame.
What is main disadvantage of stop and wait protocol?
disadvantages of stop-and-wait: fairly slow: the sender can send at most one new packet per RTT. not robust: if the ack can get lost, when the receiver gets a packet, the receiver cannot tell if it is a retransmission or a new packet.
What is moving window?
The simple technique of the “moving windows”-statistics can help. A “window” of defined size and shape is moved over the data, the moving distance is equal to the width of the window.
What is sliding window analysis?
Sliding window analysis is a commonly used method for studying the properties of molecular sequences: data are plotted as moving averages of a particular criterion, such as the number of nucleotide changes, for a window of a certain length slid along a sequence or sequence alignment (Tajima, 1991).
Why do you use the statistics window?
The Statistics Window shows statistics for the values in each of the table’s columns. You can display it using the Column Statistics ( ) button when the chosen table is selected in the Control Window’s Table List.
What is moving average in statistics?
In statistics, a moving average is a calculation used to analyze data points by creating a series of averages of different subsets of the full data set. By calculating the moving average, the impacts of random, short-term fluctuations on the price of a stock over a specified time-frame are mitigated.
How do I choose a rolling window size?
Rolling Window Analysis for Predictive Performance
- Choose a rolling window size, m, i.e., the number of consecutive observation per rolling window.
- Choose a forecast horizon, h.
- If the number of increments between successive rolling windows is 1 period, then partition the entire data set into N = T – m + 1 subsamples.
What is window size in time series?
Let us suppose there is an unknown law so every next term of time series is the function of n previous terms: and the influence of the rest time series members is negligible small. The chosen number n is called the window size.