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9780135792735 sample

status codes
routers, 358-359
troubleshooting, 162-163
STP (Spanning Tree Protocol), 
114-115, 210, 243
802.1D standard, 228
BID, 218-219, 243-244
blocking criteria, 212, 216-217
BPDU, 218, 225
configurable priority values, 244
configuration, 240, 243-244
convergence, 216
EtherChannels, 234, 247-251
Forward delay timer, 225
forwarding criteria, 216-217
Hello timer, 225
interface states, changing, 227
LAN
redundancy, 210, 214
segment DPs, choosing, 222-223
9780135792735_book.indb 788
9780135792735_book.indb 788
7/25/19 2:45 PM
7/25/19 2:45 PM


subnets 789
looping frames, preventing, 213
MaxAge timer, 225
modes, 242
multiple STP, 241
need for, 213-215
PortFast, 235
ports
blocking criteria, 212, 216-217
cost, 221
states, 232
purpose of, 215-217
roles, 227
root switches, electing, 218-219
RSTP, compared, 229-230
security, 236
STA, 216
standards, 242
states, 227
steady-state operation, 225
switch reactions to changes, 226-227
switch RP, choosing, 220-221
system ID extensions, 243-244
timers, 226-227
topology influences, 223-225
straight-through cable pinouts, 42-45
subcommands, 97
auto-cost reference-bandwidth, 493
bandwidth, 492
ip address, 376
no network network-id area area-id, 
483
switchport trunk allowed vlan, 204
subdivided networks. 
See 
subnets
subinterfaces, 396-401
subnet masks, 272, 302. 
See also
 
subnets
classful IP networks before subnetting, 
279-280
converting between formats, 305-309
difficult masks, 334-338
easy masks, 332
formats for, 304-305
hosts
borrowing bits to create subnet 
bits, 280-281
calculating in network, 313-315
choosing bits, 281
mask formats, 282-283
prefix part, 309-312
sample design, 282
VLSM, 275

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