index_L

L

L2TP (Layer-2 Tunneling Protocol), 593, 594

LANs (local area networks)

AppleTalk and, 198-202

ATM and, 124-127

backing up, 379

baseband, 339, 342

broadband, 339-342

cabling basics, 279-282

disadvantages of, 125-126

OS/2 LANs, 370-375

performance of, 315

speed of, 315

Token Ring, 455-459

topologies, 99-102

wireless, 299-311

layers, 5-7. See also specific layers

Latency, 29-30, 187

Layer-2 VPNs, 600-604

LCP (Link Control Protocol), 136-137

LDAP (Lightweight Directory Access Protocol), 255-259, 357-358, 490, 491

LDAP-3, 490

LLC (Logical Link Control), 11

Load coils, 58

load sharing, 48-49

LocalTalk, 10, 199, 200-201

"logic bombs ," 570, 577

loopback tests, 38

loops , 115-116, 428

Lotus Notes, 408

LU6.2 connectivity, 464-467

LUs (logical units), 465-466

LUN (Logical Unit Number) 608