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half/full duplex mode, 101
half-life in route damping, 505
Hashed Message Authentication Code (HMAC), 632
hashes, 632
HDLC (High-Level Data Link Control)
defined, 632
with POS interfaces, 65–66
hello intervals, 632
hello mechanism
defined, 632
in IS-IS, 262, 324–326
in OSPF, 156
hello timers, 262
hidden route repair, 520–525, 522, 571–588
hidden switch, 515
High-Level Data Link Control (HDLC)
defined, 632
with POS interfaces, 65–66
High-Speed Circuit-Switched Data (HSCSC), 632
HLR (Home Location Register), 632
HMAC (Hashed Message Authentication Code), 632
HMAC-MD5-based authentication, 278
hold down timers, 632
hold times
defined, 632
in IBGP, 426–427
in IS-IS, 262
in POS interfaces, 65–66, 68
Home Location Register (HLR), 632
host addresses for POS interfaces, 69
host keys, accepting, 14, 14
host mappings, 4–5
Host Membership Query packets, 633
Host Membership Report packets, 633
host modules, 633
host subsystems, 633
hostnames
for command prompts, 9
for OoB management network configuration, 8
for routers, 44
HSCSC (High-Speed Circuit-Switched Data), 632
HSRP (Hot Standby Router Protocol), 101
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