Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] B class IP addresses address masks subnetting backbone virtual links backbone routers bandwidth 2nd IGRP metric, modifying reference bandwidth BDRs (Backup Designated Routers), election process best path determination, convergence binary numbering system converting to decimal converting to hex bitcount format bits, IP packet flags Boolean operators AND OR boundaries boundary routers bounded updates broadcast networks IPv6 static routes, configuring broadcast updates building process for OSPF adjacencies bytes |