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object identifier (OID) in MIB, 438
OC (optical carrier), 566
octets, 258
offline operation, 438, 566
OID (object identifier) in MIB, 438
ones density, 566
Open Shortest Path First (OSPF). See OSPF (Open Shortest Path First)
Open Systems Interconnection, 567. See also OSI reference model
operation, in PDIOO methodology, 156
optical carrier (OC), 566
optimization, in PDIOO methodology, 156
optimum switching, 566
for WANs, 227
Organizational Unique Identifier (OUI), 130
OSI reference model, 11–37, 16, 567
Application layer, 17–18
bridge routing, 383
Data Link layer, 29–34
Logical Link Control sublayer, 31–32, 32
MAC sublayer, 32–33
WAN protocols, 33–34
vs. DOD model, 121
exam essentials, 49–50
IPX protocol suite and, 136
layer functions, 17
Network layer, 27–28, 29
Physical layer, 34–35
Presentation layer, 18–19
real-world use, 35–36
Session layer, 19–21
Transport layer, 21–25, 26
OSPF (Open Shortest Path First), 313, 317, 356–376, 567
configuration, 369–374
area configuration and wildcard masks, 371–375
internal routers, 369–371
multi-area router example, 373–374
configuring summary route advertised by, 280
exam essentials, 393–394
features and operation, 358–367
designated routers, 362–363
initialization, 358–362, 360
initializing and maintaining route information, 363–367
filtering, 376
metrics, 368–369
redistribution, 375–376
route summarization, 374
stub areas, 374–375
OUI (Organizational Unique Identifier), 130
out-of-band environment, 486
out-of-band management, 567
out-of-band signaling, 567
outbound packets, 409
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