A local LAN bridge consists of the hardware and software required to link        two diff. LANs or S________ located at the S____ S____ into one I_______.




The simplest bridge examines a packett's __ bit D______ address field and        compares it with a table of addresses of workstations on it's network.




Some bridges create their own table of source & destination A_______s and        if a match is found it F____s the packet sends 4t on it's way otherwise         the packet is F______ across the bridge to the next network.




Simple bridges keep forwarding packets H___ by H___ until they reach the        network with the desired D______ address.  This process of fowarding pac-       kets is call T_____B____ but B____ & M_____ packet are always forwarded.




Bridges do not understand H____ level protocol. They function at the M___       S___level of OSI's Data Link layer as long as networks on both sides ad-         here to IEEE 802.2 L____L___C____ standards regardless of media.
higher
MAC / sub
logical link control

The advantages of using bridges are increased E_____ S______ & D_____.          They are efficient because they can F_____ packets according P_____C_____       to reduce traffic C_____ & S____ by dividing large nets into smaller ones.




Larger networks are slowed down by C______s so smaller networks linked by       bridges for E-____ and the like do overcome the Ethernet L_______s of           __.__Km max length & max 3 segments (avoiding the _._ms propagation delay)




The __ Mbs version of Token Ring limits the no. of net workstations to ___       with U_____T_____P____ & ___ with IBMs own sheilded cabling but the use         smaller bridged metworks can O_______ these limitations.




Also bridges are efficient because they also can use diff. topologies and       media and link these via bridges using media like expensive high B________      medium only on a B____B____ where the most traffic carried.




Since bridges B_____ packets they can span LANs with different T____S____.




Secondly bridges provide security by forwarding only those P______ with         certain S_____ or D______ addresses so only certain nets W__________s can       send or recieve info. from another subnetwork.




I_____ bridges can bridge twin file servers providing security in the            form of a B_______ F___ S_____.




Bridge can increase D_______ a network can span acting as a R_____ because       they A________ the signal when they R__________ packets.




Bridges can be cascaded to connect LANs S__________.
sequentially



Although A___ bridges can update their R______T_____ only I______ bridges        can filter packets based on D______ C______ and offer some S______               E______F______ by which S______ assign A______ privileges.
all / routing tables
intelligent / desired criteria
source explicit forwarding
supervisors / access
Supervisors can assign internetwork acces P_______s by L____ing specific         address in routing tables as A______ or I_____ to specific users/groups.
privileges
labeling
accessible
inaccessible
The S______ T____ A_______ (dev. by DEC and Vitalink) was adopted as a          standard by the IEEE 8__._ committee.  S.T.A. bridges M_____ nets with          more than one L_____ or multiple P___s connect one net to another net.
spanning tree alogorithm
802.1
multiple
loop / paths
Under STA each bridge has an I____ (a P____ field) & G___A____S__ address       used to select the R____ bridge negotiating which route data will take and      if two have the same priority the one with the high address is the R____.
identifier
priority
globally administered station address
root / root
Bridge's R_____ P____ point to the root bridge.
root port



Supervisors select root bridges by CR_____ like least C____ like L___S____      and buffer C_____ when more than one bridge is connected to a LAN.
criteria
cost
line speed
capacity
If all costs are equal STA produces a T___ like structure selecting B_____       ports with less H__s from bridge to bridge to transmit a packet from LAN        to LAN.
tree
bridge
hops

After negotiating each bridge sets it's root port F_____ to move data to        the root bridge and it's port away from the root bridge in a F_____ state       while B______ other bridges so P_____ take the most E______ path.
forward / forward
blocking
packet / efficient
efficient
If a port has been blocked and in the L_______ mode updates its database         of net station addresses it changes to the F_____ M___  and notifies the        R___ B____ and the R_B_ notifies the net bridges to include this bridge.
learning
forward mode
root bridge
include this bridge on their database
A bridge's A______ D_______ include info on the direction to forward data       for a particular workstation as well as a T____ that can expire and make         the direction to forward data info no longer V____.




In 19__ I__ introduced its S____ routing with its T____ ring for the PCLAN       program and OS/2.  These bridges actually perform routing duties at the         N_____ level of the OSI model giving each device a unique 6byte A______.
1985
source
token ring
network / address
A workstation gathers routing info by transmitting ans A__R____B____ frame       to all R____ connected on the internet that contains C______ info.
all routes broadcast frame
rings
control