Exam Essentials
Written on 05:18 by Ahmet Emir
Remember the accessible causes of LAN cartage congestion. Too abounding hosts in a broadcast
domain, advertisement storms, multicasting, and low bandwidth are all accessible causes of LAN
traffic congestion.
Understand the aberration amid a blow area and a advertisement domain. Collision
domain is an Ethernet appellation acclimated to call a arrangement accumulating of accessories in which one particular
device sends a packet on a arrangement segment, banishment every added accessory on that same
segment to pay absorption to it. On a advertisement domain, a set of all accessories on a arrangement segment
hear all broadcasts beatific on that segment.
Understand the aberration amid a hub, a bridge, a switch, and a router. Hubs actualize one collision
domain and one advertisement domain. Bridges breach up blow domains but actualize one large
broadcast domain. They use accouterments addresses to clarify the network. Switches are absolutely just
multiple anchorage bridges with added intelligence. They breach up blow domains but actualize one large
broadcast area by default. Switches use accouterments addresses to clarify the network. Routers break
up advertisement domains (and blow domains) and use analytic acclamation to clarify the network.
Remember the aberration amid connection-oriented and connectionless arrangement services.
Connection-oriented casework use acknowledgments and breeze ascendancy to actualize a reliable session.
More aerial is acclimated than in a connectionless arrangement service. Connectionless casework are
used to accelerate abstracts with no acknowledgments or breeze control. This is advised unreliable.
Remember the OSI layers. You charge bethink the seven layers of the OSI archetypal and what
function anniversary band provides. The Application, Presentation, and Affair layers are high layers
and are amenable for communicating from a user interface to an application. The Transport
layer provides segmentation, sequencing, and basic circuits. The Arrangement band provides logical
network acclamation and acquisition through an internetwork. The Abstracts Link band provides
framing and agreement of abstracts on the arrangement medium. The Physical band is amenable for taking
1s and 0s and encoding them into a agenda arresting for manual on the arrangement segment.
Remember the types of Ethernet cabling and back you would use them. The three types of
cables that can be created from an Ethernet cable are straight-through (to affix a PC’s or
a router’s Ethernet interface to a hub or switch), crossover (to affix hub to hub, hub to
switch, about-face to switch, or PC to PC), and formed (for a animate affiliation from a PC to a
router or switch).
Understand how to affix a animate cable from a PC to a router and alpha HyperTerminal.
Take a formed cable and affix it from the COM anchorage of the host to the animate anchorage of a
router. Alpha HyperTerminal and set the BPS to 9600 and breeze ascendancy to None.
Remember the three layers in the Cisco three-layer model. The three layers in the Cisco
hierarchical archetypal are the core, distribution, and admission layers.
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