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818
packet-switching services, 590
ATM, strengths/weaknesses, 591, 602
Frame Relay, strengths/weaknesses,
591, 602
X.25, strengths/weaknesses, 591, 602
PPP
compression, 526­528
configuration, 523­528
error detection, 525
LCP, 524­525
looped link detection, 525
protocols
error recovery, 522
HDLC, 521, 523, 598
LAPB, 521­522, 598
LAPD, 522, 598
PPP, 521, 523, 598
Protocol Type field, 522
SDLC, 522, 598
routers, 593
synchronous serial leased lines, 520, 590, 597
clock source, 521, 597
encapsulation, changing, 524
framing, 520
HDLC, 522, 591, 602
LAPB, 522, 591, 602
PPP, 522, 591, 601
well-known port numbers, 219
wildcard masks
extended IPX access list concerns, 486
IP addresses, 462­463
standard IPX access lists, 482­483
windowing, 93
TCP flow control, 221­222
write erase command, 40, 187
write terminal command, 279
X
X.21 WAN cabling standard, 529
X.21 WAN interface standard, 599
X.25
CCNA exam coverage, 590
strengths/weaknesses, 591, 602
Y-Z
zero subnet, 261
WANs (wide-area networks)
fmix.fm.4D3 Page 818 Monday, March 20, 2000 6:13 PM