[ Pobierz całość w formacie PDF ]

Presentation layer. You need to know what a session is so that you know what the Session layer does.
See ÝCommunicating on the Session Layer.Û
2.
C. Think of it as two circuits (send and receive) making up a duplex. If you can transmit on only one
circuit at a time, youÇre using only half of the duplex. Review ÝA half-duplex is not a housing unit.Û
3.
B. Ethernet networks use CSMA/CD and thatÇs what weÇre talking about here. Take a look at
ÝAvoiding whole collisions on the half-duplex.Û
4.
A. A duplex is made up of two (du) wires (plexes), so if you use both plexes at the same time, youÇre
using the whole duplex, or a full-duplex. Check out ÝPlaying with a full duplex.Û
5.
D. Ethernet networks regardless of mode support 10 to 1,000 Mbps. See ÝPlaying with a full duplex.Û
6.
C. FTP (File Transfer Protocol) is an Application layer protocol. Review ÝTesting your session
skills.Û
7.
B. Okay, this may seem like a trick question, but if you read the question very carefully, you notice
that the question asked about data conversion and not graphic conversions. Be sure you read the
questions on the CCNA exam very carefully and answer them as they are posed. DonÇt supply more
information than youÇre given or make assumptions about what the question means. It is what it is.
Look over ÝPresenting the Presentation Layer.Û
8.
D. You needed an easy one after the previous question. TCP/IP is a protocol suite and is most
definitely not on the Application layer, although a few of the protocols in it are. Check out ÝApplying
the Application Layer.Û
9.
C. ItÇs on the Network layer that routing, which is the mechanism that affects end-to-end delivery of
data across the internetwork, is defined. See ÝA Quick Review of the OSI Model.Û
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10. C. Just remember, ÝPlease Do Not Throw Salami Pizza Away.Û Review ÝA Quick Review of the OSI
Model.Û
82
Part III: Routers
Chapter List
Chapter 8: Router Models
Chapter 9: Router Basics
Chapter 10: Router Commands
Chapter 11: RIP, IGRP, IPX, and Convergence
In this part&
A very good, but very British, friend of mine pronounces routers as Ýrooters,Û claiming that what a ÝrooterÛ
does is send packets over the best route (pronounced ÝrootÛ). Regardless of how you pronounce it, heÇs
absolutely right about what they do.
On a test focused on Cisco routing and switching, itÇs logical that a goodly portion of the test is about
routers. Not only is it logical, itÇs a fact. In terms of the number of questions on the test, routers are only
second to the OSI model. You must know about the makeup of a router and the commands used to access,
configure, and manage a router. You must know how to work with the IOS software as well as how perform
software updates or backups on the router. You must also be familiar with routed and routing protocols and be
able to differentiate the two.
There are five chapters in this part of the book, all of which cover an area of routers and routing that you must
know for the exam. Whether this part of the book is your first stop or last as you prepare for the exam, just be
sure it is included on your study plan.
83
Chapter 8: Router Models
Exam Objectives
" Using a router to segment a LAN
"
Describing the benefits of LAN segmentation
"
Defining router elements
For the CCNA exam, you need to be familiar with routers, especially how they think, how they relate to other
networking devices, and where they fit into the networking world. ThereÇs quite a bit that you must know to
pass the routers part of the test.
Time-Saver However, there are some things that you donÇt need to know for the exam. Just so you donÇt
waste valuable time studying the wrong stuff, take these topics off your must-study list:
" You donÇt need to be able to field strip and reassemble a router either blindfolded or not.
"
You donÇt need to memorize the processor speeds and specific memory amounts in particular Cisco
router models, and you wonÇt be asked to determine the proper memory or processor configuration
for a router.
"
There are no questions regarding the general anatomy of a router, and you wonÇt be asked to list the
main component parts of a router, with the exception of memory.
These are real-world topics that may be valuable to know on the job or to throw out casually in an interview,
but they arenÇt on the test. Anyone who tells you to study this stuff for the exam is wasting your time.
This chapter also includes background information you must understand without which some of the
examÇs questions may make no sense to you. Even with this background information, thereÇs a chance that
some questions may still be incomprehensible, but we think that may just be part of the Cisco game plan. We
have no other explanation.
Quick Assessment
1. The three-tier hierarchical network design implemented by Cisco consists of the ______, ______,
and ______.
2.
Local traffic stays local and reduced collision domains are a result of ______.
3.
A ______ can connect two or more ______ using two different routable protocols.
4.
Logical addresses are used by a router to ______ LANs.
5.
There are ______ types of memory used in a Cisco router.
6.
The Cisco IOS software resides in the ______ memory.
7.
NVRAM stores the ______ file.
84
8. EPROM stores the ______ system image and ______.
9.
______ is a proprietary Cisco protocol that allows directly connected Cisco devices to learn about
each other.
10.
The default holdtime for CDP is ______.
Answers
1. Core (big, fast, and expensive), Distribution (campus backbone), Access (LAN segmentation). See [ Pobierz całość w formacie PDF ]