Compare Parts of CCNA INTRO

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As Spy1954 did for both A+ and Network+, here is a quick run down of comparisons of terms/concepts involved in the CCNA INTRO exam. Feel free to add your own!

Ethernet (DIX) uses a 2-byte Type field

Ethernet (802.3) uses a 1-byte Destination Service Access Point (DSAP) field

Ethernet (802.3 w/ SNAP) sets the DSAP/SSAP fields to AA, and uses a 5-byte SNAP field

Half-duplex NICs use loopback circuitry to detect collisions

Full-duplex NICs don't, since collisions don't occur

Broadcast address = FFFF.FFFF.FFFF

Multicast address = 0100.5exx.xxxx

Fast Ethernet = 802.3u

Gigabit Ethernet (optical) = 802.3z

Gigabit Ethernet (electrical) = 802.3ab

IP addresses in same group must not be separated by a router

IP addresses separated by router must be in separate group

RARP broadcasts IP, obtains MAC only

Bootp broadcasts IP, obtains MAC, subnet mask, default gateway, other server IPs, and name of file to be downloaded

Different Sizes of fields in TCP Header:

Source Port = 16 buts

Destination port = 16 bits

Sequence = 32 bits

Acknowledgement = 32 bits

Window = 16 bits

Checksum = 16 bits

Connection-establishment is 3-way, uses SYN flag

Connection-termination is 4-way, uses FIN flag

Console Password = line console 0

Aux password = line aux 0

Telnet password = line vty 0 4

Crossover cabling is used between routers/switches

Straight-through cabling is used between switches/host machines

RIP uses hop count as a metric

IGRP uses bandwidth and delay

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