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consider an arq algorithm running over a 20-km point-to-point fiber linka compute the propagation delay for this link
consider an arq protocol that uses only negative acknowledgments naks but no positive acknowledgments acks describe
with 1 parity bit we can detect all 1-bit errors show that at least one generalization fails as followsa show that if
assume that a sonet receiver resynchronizes its clock whenever a 1 bit appears otherwise the receiver samples the
give an example of a 4-bit error that would not be detected by two-dimensional parity as illustrated in figure 216 what
show that the internet checksum can be computed by first taking the 32-bit ones complement sum of the buffer in 32-bit
suppose that one byte in a buffer covered by the internet checksum algorithm needs to be decremented eg a header hop
suppose we want to transmit the message 11001001 and protect it from errors using the crc polynomial x3 1a use
suppose we want to transmit the message 1011 0010 0100 1011 and protect it from errors using the crc-8 polynomial x 8
the text suggests that the sliding window protocol can be used to implement flow control we can imagine doing this by
in stop-and-wait transmission suppose that both sender and receiver retransmit their last frame immediately on receipt
show that the internet checksum will never be 0xffff that is the final value of sum will not be 0x0000 unless every
suppose a workstation has an io bus speed of 1 gbps and memory bandwidth of 2 gbps assuming dma in and out of main
in the 4b5b encoding table 24 only two of the 5-bit codes used end in two 0s how many possible 5-bit sequences are
assuming a framing protocol that uses bit stuffing show the bit sequence transmitted over the link when the frame
suppose the following sequence of bits arrive over a link 011010111110101001111111011001111110 show the resulting frame
suppose you want to send some data using the bisync framing protocol and the last 2 bytes of your data are dle and etx
show the nrz manchester and nrzi encodings for the bit pattern shown in figure 246 assume that the nrzi signal starts
suppose a 10-mbps ethernet hub repeater is replaced by a 10-mbps switch in an environment where all traffic is between
an ethernet switch is simply a bridge that has the ability to forward some number of packets in parallel assuming the
describe how a batcher network works see the further reading section explain how a batcher network can be used in
a stage of an n times n banyan network consists of n2 2 times 2 switching elements the first stage directs packets to
suppose that a switch is designed to have both input and output fifo buffering as packets arrive on an input port they
cell switching methods essentially always use virtual circuit routing rather than datagram routing give a specific
recall that aal34 has a crc-10 checksum at the end of each cell while aal5 has a single crc-32 checksum at the end of