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] data links address masks IP addresses masks subnets TCP/IP data structure of OSPF neighbors components 2nd data-link identifiers, ARP Database Description packets (OSPF) DC-bit DD (Database Description) packets debug arp command debug eigrp neighbors command debug ip icmp command debug ip packet command debug ip policy command debug ip rip command 2nd debug ipv6 packet command debugging route table entries decimal numbering system converting to binary converting to hexadecimal IP addresses decision points for OSPF adjacency formation decision process (IS-IS) default IGRP timers, modifying default metrics, IGRP calculating modifying default networks advertising default routes 2nd classless route lookups configuring in IPv6 ip default-network command IPv4 filtering flapping gateway of last resort in hub-and-spoke topologies large-scale use of redistribution risk of suboptimal routing static "don't care" bits redistribution default-information originate command always keyword for IPv6 addresses default-metric command delay metric 2nd modifying delayed acknowledgments demand circuits OSPF, configuring presumption of reachability depletion of IPv4 addresses designated routers (IS-IS) designing lollipop-shaped address spaces subnets Destination Address field (IPv6 packets) destination ports, TCP devices, boundary routers DF bit DiffServ (Differentiated Services framework) diffusing computations feasible successor selection process digits Dijkstra, E.W. Dijkstra's algorithm direct acknowledgments directly connected subnets disabling automatic summarization on EIGRP split horizon summarization on RIPv2 discontiguous subnets 2nd configuring RI summarizing RIPv2 routes across displaying IGRP delay IPv6 addresses IS-IS link state database IS-IS neighbor table RIPng processes distance command 2nd 3rd distance vector routing protocols 2nd asynchronous updates characteristics of broadcast updates full routing table updates neighbors periodic updates counting to infinity holddown timers RIP configuring metrics, configuring route filtering route invalidation timers routing by rumor split horizon triggered updates distribute-list command 2nd 3rd distributed database protocols. [See link-state protocols] domain authentication, IS-IS configuration Domain Name Service lookups, OSPF configuration domains IS-IS, domain-wide prefix distribution extension OSPF, areas Don't Fragment (DF) bit dotted-decimal format 2nd Down state (OSPF neighbors) DRs (Designated Routers) DRothers election process DSCP (Differentiated Services Code Point) DUAL (Diffusing Update Algorithm) feasible successors, selection process input events dual-protocol routing, configuring Duplicate Address Detection dynamic ACLs Dynamic Hostname Exchange dynamic routing protocols, RIP. [See RIP (Routing Information Protocol)] |