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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
assuming the 20-cell aal5 packet from the previous problem suppose a final cell is tacked on the end of the pdu and
how reliable does an atm connection have to be in order to maintain a loss rate of less than one per million for a
propose a mechanism that might be used by datagram switches so that if one switch loses all or part of its forwarding
the virtual circuit mechanism described in section 312 assumes that each link is point-to-point extend the forwarding
give an example of a working virtual circuit whose path traverses some link twice packets sent along this path should
in section 312 each switch chose the vci value for the incoming link show that it is also possible for each switch to
given the extended lan shown in figure 337 indicate which ports are not selected by the spanning tree algorithmfigure
given the extended lan shown in figure 337 assume that bridge b1 suffers catastrophic failure indicate which ports are
consider the arrangement of learning bridges shown in figure 338 assuming all are initially empty give the forwarding
as in the previous problem consider the arrangement of learning bridges shown in figure 338 assuming all are initially
suppose that m in figure 341 sends to itself this normally would never happen state what would happen assuminga the
the cs-pdu for aal5 contains up to 47 bytes of padding while the aal34 cspdu only contains up to 3 bytes of padding
the ip datagram for a tcp ack message is 40 bytes long it contains 20 bytes of tcp header and 20 bytes of ip header
what percentage of an atm links total bandwidth is consumed by the atm cell headers what percentage of the total
suppose a bridge has two of its ports on the same networkhow might the bridge detect and correct
suppose some repeaters hubs rather than bridges are connected into a loopa what will happen when somebody transmitsb
consider the extended lan of figure 312 what happens in the spanning tree algorithm if bridge b1 does not participate
suppose two learning bridges b1 and b2 form a loop as shown in figure 341 and do not implement the spanning tree
give the spanning tree generated for the extended lan shown in figure 340 and discuss how any ties are resolvedfigure
consider hosts x y z w and learning bridges b1 b2 b3 with initially empty forwarding tables as in figure 339a suppose x
suppose in figure 34 that a new link has been added connecting switch 3 port 1 where g is now and switch 1 port 0 where
suppose host a is sending to a multicast group the recipients are leaf nodes of a tree rooted at a with depth n and