Index_O

O

objects, 538

in Novell NetWare, 218

in X.500, 254

OC (optical carrier) levels, 329–330

octets, 78, 124, 538

ODI (Open Datalink Interface), 538

OE (operator error), 461, 538

offline devices, 322, 538

offset field, 112

OLTSs (optical loss test sets), 300

on-access virus scans, 440

on-demand virus scans, 439–440

100BaseT standard, 29–30

100BaseVG standard, 30, 512

100VG (Voice Grade) standard, 512

100VG-AnyLAN standard, 512

Open Datalink Interface (ODI), 538

Open Shortest Path First (OSPF), 80, 88–89

Open Systems Interconnect model. See OSI (Open System Interconnect) model

OpenLinux operating system, 235, 538

OpenServer Unix, 236

Operation Aborted code, 477

operator error, 461, 538

optical carrier (OC) levels, 329–330

optical disks for backups, 427

optical loss test sets (OLTSs), 300

options field in TCP, 113

Orange Book security, 380–383

.org domain, 137

Organizationally Unique Identifiers (OUIs), 123

OS/2 application support subsystem, 228

OSI (Open System Interconnect) model, 52–54, 53–54, 538

Application layer, 54, 86

Data Link layer, 56, 64–75, 64, 68, 74–75

exam essentials for, 94–96

key terms for, 96–97

Network layer, 55–56, 76–82, 77, 79

Physical layer, 56–63, 58–63

Presentation layer, 55, 86

Session layer, 55, 85

summary, 94

and TCP/IP, 110–111, 110

Transport layer, 55, 82–85, 83

OSPF (Open Shortest Path First), 80, 88–89

OUIs (Organizationally Unique Identifiers), 123

outlets

in SPSs, 416

in UPSs, 417–418

oversampling, 539

overvoltage threshold, 260, 539