index_P

P

packet cellular, 469471

packet filters, 564565

packet switching, 439

packets, 439, 447

PAP (Password Authentication Protocol), 137

parameters, 158

Passive Optical Networks (PONs), 7074

passwords, 528, 531, 551552, 570

PCAs (Policy Certification Authorities), 557

PCI (Peripheral Interconnect) bus, 318327

PCI-X, 323324

PCMCIA cards, 468, 469

PDAs (Personal Digital Assistants), 468

PDUs (Protocol Data Units), 157, 484

PEM (Privacy Enhanced Mail), 557

performance

bridges and, 430

cable modem systems and, 142

of internetwork caching, 412413

of LANs, 315

management tools for, 481

NICs and, 315

policies for, 489

of servers, 517522

switching and, 440

Perl, 229230

Perlman, Radia, 15

PGP (Pretty Good Privacy), 557, 561

Physical layer

802.11 standard, 305307

802.11b standard, 307311

described, 5, 38

DSUs and, 38

protocols for, 2364, 199200

pipes, 375376

polar signaling, 39

policy-based networks, 170, 487491

POP3 (Post Office Protocol 3), 386387, 390

POTS (plain old telephone system), 42, 43, 472

PPP (Point-to-Point Protocol), 50, 135139, 151

PPPoE (PPP over Ethernet), 138139

PPTP (Point-to-Point Tunneling Protocol), 594

Presentation layer, 7

PRI (Primary Rate Interface), 4244

primitives, 158

print servers, 366369, 376378

printing, 366369, 507

problems. See troubleshooting

protocol analyzers, 496500, 503504, 530, 532

protocol stacks, 3

protocol standards, 4

protocols. See also specific protocols

for e-mail, 389390

overview of, 314

references for, 1418

for routing, 15, 446450

proxy servers, 564568

PSK (Phase-Shift Keying), 27, 28

PSTN (Public Switched Telephone Network), 30, 144, 145

public key cryptography, 556558, 559563

PUs (physical units), 465466

PVCs (Permanent Virtual Circuits), 439, 440