Index C

B

B (Bearer) channels, 471

B8ZS (Binary 8-Zero Substitution), 470

back ends, 470

BackboneFast feature, 192-193

configuring and verifying, 193

defined, 470

backbones

defined, 470

MBONE, 308, 317-318

scaling, 27-28, 27

for VLANs, 91, 91-92

Backup Designated Routers (BDRs), 310

Backward-Explicit Congestion Notification (BECN) bit, 471

bandwidth

in campus networks, 4-5

defined, 470

importance of, 46

Bandwidth on Demand (BoD), 471

baseband technology, 470

Basic Management setup mode, 470

Basic Rate Interface (BRI), 472

baud, 471

BDRs (Backup Designated Routers), 310

beacons, 471

Bearer (B) channels, 471

bearer services, 471

BECN (Backward-Explicit Congestion Notification) bit, 471

best efforts networks, 354-355, 355

connection-oriented transport in, 355

connectionless transport in, 356

defined, 471

problems in, 356-358

streaming transport in, 356

best path selection, 142-145

BGP protocol, 471

bidirectional shared trees

defined, 471

for multicast traffic routing, 305, 306

Binary 8-Zero Substitution (B8ZS), 470

binary numbering system, 471

binary trees in fast switching, 267, 267

BIP (Bit Interleaved Parity), 471

BISDN (Broadband ISDN), 471

Bit Interleaved Parity (BIP), 471

bit-oriented protocols, 471

blocking mode, 145-146, 146

BoD (Bandwidth on Demand), 471

Boot ROM, 471

Border Gateway protocol, 471

border gateways, 472

border routers, 472

BPDUGuard, 189

BPDUs (Bridge Protocol Data Units)

BackboneFast for, 192

defined, 472

delays in, 144, 163

and PortFast, 189

in STP, 144-146

BRI (Basic Rate Interface), 472

bridge IDs

defined, 472

for designated ports, 147

MAC address, 152

priority of, 152

for root bridges, 142

Bridge Protocol Data Units. See BPDUs (Bridge Protocol Data Units)

bridges, 4

for broadcasts, 5

defined, 472

priority of, 168-169

root. See root bridges

vs. switches, 136-137

timers for, 152

bridging, 472

bridging tables, 406-407

Broadband ISDN (BISDN), 471

broadband transmissions, 472

broadcast and unknown servers (BUS), 473

broadcast domains

defined, 472

in layer 2 switching, 13

broadcast storms

defined, 472

in layer 2 switching, 140, 140

broadcasts, 286-287, 286

in campus networks, 5-6

defined, 472

in layer 2 switching, 139

in VLANs, 89-90

brute force attacks, 472

bsr-border option, 320

buffer overflows

in best efforts networks, 358

defined, 473

buffers

contiguous, 408-410

defined, 472

particle, 410, 410

in voice transmissions, 353, 353

buffers command, 410

Building Access Module, 30, 31

building blocks, 22

core blocks, 22-26, 24-26

layer 2 backbones, 27-28, 27

layer 3 backbones, 28

switch blocks, 22-23

Building Distribution Module, 30, 30, 53

Building Module, 30, 30, 53

bursting, 473

BUS (broadcast and unknown servers), 473

bus fabrics, 404-405, 405, 473

bus topology, 473

buses

defined, 473

in process switching, 266

BX.25 standard, 473

bypass mode, 473

bypass relays, 473

byte-oriented protocols, 473