CCENT 640-822 ICND1 Exam Topics Review

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Oct 23, 2013 (3 years and 7 months ago)

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23 October 2013

CCENT 640
-
822 ICND1 Exam Topics Review

TCP/IP and OSI Networking Models

23 October 2013

Disclaimer


This review is for the exclusive non
-
profit use by
Cisco Academy instructors and students only!


Contents of this review were derived from the following
sources under the doctrine of US copyright “Fair Use”
section 107:


Cisco Networking Academy Curricula: Discovery Networking for
Home and Small Businesses version 4.x


Interactive Course Guide, Cisco Learning Institute


CCENT/CCNA ICND 1 Official Exam Certification Guide, 2
nd

ed.
by Wendell Odom, Cisco Press, 2008; ISBN1
-
58720
-
182
-
2


Cisco Learning Network
https://learningnetwork.cisco.com/docs/DOC
-
4987


Other references footnoted in individual slide notes area.


23 October 2013

Error Reporting


Please report any errors in this presentation to:


remeyers@mail.wvu.edu


Don’t rant! Let me know where I made a mistake so it can
be fixed.


Feel free to add, subtract, modify, this presentation with
the request that the WVU master and my name be
removed from your results.

23 October 2013

CCENT Exam Topics


Describe the operation of data networks


Use the OSI and TCP/IP models and their associated
protocols to explain how data flows in a network


Describe the purpose and basic operation of the
protocols in the OSI and TCP models


https://learningnetwork.cisco.com/docs/DOC
-
4987


23 October 2013

TCP/IP Protocol Architecture


The
TCP/IP model

is a description framework for
computer network protocols created in the 1970s
by the US Department of Defense.
1


It describes a set of general design guidelines and
implementations of specific networking protocols to
enable computers to communicate over a network.
2


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TCP/IP Protocol Architecture

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TCP/IP Application Layer


Defines and provides services to the PC
application software, such as browser requests for
web page file transfers


HTTP


request and response


HTML


to properly read and display received file

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TCP/IP Transport Layer


Provides the Application layer with communication
session and datagram services


T
ransport
C
ontrol
P
rotocol: One
-
to
-
one, connection
-
oriented, reliable, error free delivery of data.


U
ser
D
atagram
P
rotocol: Connectionless, unreliable data
delivery

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TCP/IP Internet Layer


Responsible for addressing, packaging, and
routing functions .


I
nternet
P
rotocol


Hierarchical IP addressing of networks and hosts


Packet routing by transferring data from router to router.

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TCP/IP Network Addressing Layer


Defines protocols and hardware required to deliver
data across a physical network.


Serves the Internet layer by encapsulating data with
appropriate framing for the physical network.

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Data Encapsulation


Data is “wrapped” with protocol information at each
layer of the TCP/IP model when a host transmits
data to another device across a network

23 October 2013

Data Encapsulation Example in TCP/IP


Application


Data from browser gets an HTTP header


Transport


HTTP request is segmented with each segment getting a
port and sequence number.


Internet


Each TCP segment gets an IP address header and
becomes a packet.


Network Access


Each IP packet gets a frame header and trailer including
frame check sum error information.


Data bits encoded for proper physical delivery; copper,
fiber, wireless

23 October 2013

Data Encapsulation Terms in TCP/IP

23 October 2013

Data Encapsulation Example in TCP/IP

23 October 2013

OSI Reference Model


The
O
pen
S
ystems
I
nterconnect Model was
developed by the International Organization for
Standardization (ISO) in 1984


7 layer model

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OSI Layering Concepts and Benefits


Less complex and easier to learn


Breaks concepts into smaller easier to explain parts


Standard Interfaces


Vendor neutral for open development


Multi
-
vendor interoperability of applications & devices


Modular engineering


Applications and hardware device development can be
done at any layer



23 October 2013

OSI Reference Model

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OSI Protocol Data Units


PDU contains data as well as header/trailer at each
layer similar to TCP/IP model


23 October 2013

Data Flow Using TCP/IP & OSI Models

data

data

23 October 2013