Commands (show, debug)
Infrastructure (NVRAM, Flash, Memory & CPU, File system, config reg)
Operations (file transfers, Password recovery, SNMP, Accessing the device, Security, Security [password])

OSI Models
General Routing Concepts (Split horizon, Link state, difference between switching and routing, Summarization, Link state vs. Distance vector, loops, Tunneling)
Standards (802.x, cable specs, protocol limitations)
Protocol Mechanics (Windowing/ACK, fragmentation, MTU, handshaking, termination)

Transparent (IEEE/DEC Spanning tree, Translational, IRB, ACLs, MISTP)
SRB (SRT/LB, SRT, DLSw, RSRB, ACLs)
LAN Switching (Trunking, VTP, DISL, VLANS, Fast Ether Channel (FEC), CDP, CGMP)
Security (VACL, RACL, Private VLANS)
MLS

Addressing (CIDR, subnetting, ARP, NAT, HSRP)
Services (DNS, BOOTP, DHCP, ICMP)
Applications (telnet, FTP, TFTP)
Transport (IP fragmentation, sockets, ports)
ACLs
IPv6 (Basic)

OSPF (I -Design: areas, Virtual links, stub, NSSA, ABR/ASBR redistributions, media dependencies, external vs. internal, Summarization. II – Operation: DR, BDR, adjacencies, LSA types, link state database, SPF algorithm, authentication)
Services (DNS, BOOTP, DHCP, ICMP)
BGP( I -Design: Peer Groups, Route Reflectors, Confederations, Clusters, Attributes, AS. II – Operation: Route Maps, Filters, Neighbors, decision algorithm, IBGP, EBGP)
EIGRP (Metrics, mechanics, & design)
IS-IS (Metrics, mechanics, & design)
ACLs (distribute lists, route maps, policy routing, redistribution, route tagging)
DDR (dial backup)
IGRP
RIP
RIPv2

Fancy Queuing
PoS and IP precedence
CoS
Weighted RED
WRR/queu scheduling
Shaping vs. Policing (rate limiting)/CAR
NBAR
802.1X
DSCP

ISDN (LAPD, BRI/PRI framing, signaling, mapping, NI1s, dialer map, interface types, B/D channel, channel bonding)
Frame Relay (LMIs, DLCI, PVC, framing, traffic shaping, FECN, BECN, CIR, DE, Mapping, compression)
ATM (PVC/SVC, AAL, SSCOP, UNI/NNI, ILMI, Cell format, QoS, RFC 1483, PNNI, mapping)
Physical Layer (Synchronization, SONET, T1, E1, encoding)
Leased Line Protocols (HDLC, PPP, Async & modems, compression)
PoS
DPT/SRP

Data Link Layer (addressing, 802.2)
Ethernet/FE/GE (encapsulation, CSMA/CD, topology, speed, controller errors, limitations)
Wireless/802.11b

Voice/Video (H323)
codecs
SS7
RTP
RTCP
SIP
MPLS

IGMP/CGMP (IGMPv1, IGMPv2, Designated Querier)
Addressing (Group addresses, Admin Group, Link-local L3-to-L2 Mapping)
Distribution Trees (Shared Trees, Source Trees)
PIM-SM Mechanics (Joining, Pruning PIM State, Mroute table)
Rendezvous Points (Auto-RP, BSR)