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What is piggybacked ACK
The protocol will be incorrect. Suppose that 3-bit sequence numbers we are using. Consider following situation:
A just send frame 7.
B gets frame and sends a piggybacked ACK.
A gets ACK and sends frames 0-6, all of that get lost.
B times out and again transmits its current frame, with ACK 7.
Look at the situation at A when frame with r.ack = 7 arrive. The key variables are AckExpected = 0, r.ack = 7, and Next Frame to Send = 7. The modified among will return true, causing A to think lost frames were being acknowledged.
can we correct errors using crc?
Token Bus Physical order of stations doesn't matter Line is broadcast medium "Send" token by addressing neighbour Provisions for deleting, adding stations
Q. Working of TCP - buffers? TCP - buffers Sending & receiving buffers - Processes don't consume data at the same speed Sending site: - White section: unfilled
a. If a password to a cipher is exactly 8 characters long, and each character can be selected from [0-9], [a-z], and [A-Z], how many different passwords are possible? b. Suppose
What is the command to copy the IOS image to a TFTP server? Ans) Copy flash tftp
How to protect computer Hardware by threats The first component in the computer system vulnerable to attacks or threats, and most important to be protected, is the hardware.
Authoritative DNS Servers Every organization with publicly accessible hosts ( such as web server and mail several on the internet must provide publicly accessible D
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How many timers does IGRP has
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