index_H

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half-duplex communication 
half-duplex mode 
hard loop testing 
hardware backup
    reliable network components:hardware backup  2nd 
hardware tokens 
HDSL (Hi-Speed Digital Subscriber Line) 
header 
headers 
hello packets
    EIGRP 
Hello packets (OSPF) 
helper-addressing 
hierarchical address space  2nd 
hierarchical routingsystems
    flat routing systems 
Hold Timer (IGRP) 
hold-down timers
    BGP 
    IGRP 
Host-based 
HSRP 
HTML 
hubs 
hyperlinks 
hyperspace 
hypertext documents