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F O C U S FOCUS CISCO IP Addressing & The Binary System A Cisco Networking Presentation By Joe Reed Basic Goals for Addressing Understand why IP addresses are necessary Understand each network on Internet has unique network address Understand each IP address has two parts

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slide1

F

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FOCUS

CISCO

ip addressing the binary system

IP Addressing & The Binary System

A Cisco Networking Presentation

By

Joe Reed

basic goals for addressing
Basic Goals for Addressing
  • Understand why IP addresses are necessary
  • Understand each network on Internet has unique network address
  • Understand each IP address has two parts
  • Understand classes of network addresses

C11

review of ip addressing format

and a host number

Review of IP Addressing Format

Addresses are 32 Bits Long

Made up of a network number

C11

Referred to as Dotted Decimal Notation

why are ip addresses necessary
Why are IP addresses necessary?
  • Makes it possible for data passing through the Internet to findits destination.
  • There are more of them (4 billion)
  • Provides a betterway to organize computer addresses than MAC addresses
  • IP addresses may be set in software and are thus flexible

C11

how do ip addresses work
How do IP addresses work?
  • Each network connected to the Internet has a unique network number.
  • InterNIC, assigns companies blocks of IP addresses based on the size of their networks

C11

how do ip addresses incorporate network addresses
How do IP addresses incorporate network addresses?
  • Every IP Address has two parts:
    • Network Number - identifies the network to which a device is attached
    • Host Number - identifies a device's connection to that network
  • One, two, or three octects may be used to identify the network & the host numbers

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what are the different classes of networks

I S D s

What are the different classes of networks?

Class “A” Networks - World Governments

Class “B” Networks - Medium Size Companies

Class “C” Networks - The rest of us...

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how many classes of networks are there

ESC18

How many classes of Networks are there?
  • There are three classes of networks that can be assigned by the InterNIC. In actuality, there are five classes of networks.
  • Only three of these are used commercially.
    • “A”
    • “B”
    • “C”
  • The other two are reserved.
who assigns network addresses
Who assigns network addresses?
  • As with the host number portion of class "A," class "B," and class "C” addresses, subnet addresses are assigned locally.
  • Usually this is done by the network administrator.
  • Like other IP addresses, each subnet address is unique.
what is included in a subnet address
What is included in a subnet address?

Analogy:

Subnets are similar to the American telephone number system .

C12

concealing subnet addresses from outside networks
Concealing subnet addresses from outside networks.
  • Subnets are concealed from outside networks by using a mask.
  • These are referred to as subnet masks.
  • The function of a subnet mask is to tell devices which part of an address is the network number including the subnet, and which part is the host
review
Review
  • IP addresses are used to identify a machine on a network and the network to which it is attached. (T/F)
  • True!
  • Each network connected to the Internet has a unique network number. (T/F)
  • True!
  • The network portion of every IP address is assigned by the local network administrator. (T/F)
  • False!
review31
Review
  • In a class "A" network using an IP addressing scheme, the first 16 bits are used for the network part of the address, and the last two octets are reserved for the host part of the address.(T/F)
  • False!
  • IP addresses are assigned by the NIC card manufacturer. (T/F)
  • False!
review32
Review
  • All class “C” networks have the same network number. (T/F)
  • False!
  • In a class “A” network the first 8 bits are used for the network part of the address. (T/F)
  • True!
  • The host portion of every IP address is assigned by the local network administrator.
  • True!
review33
Review
  • A network portion of the following address, 109.43.211.40, shows it to be what class of network?
  • A
  • A network portion of the following address, 220.43.211.40, shows it to be what class of network?
  • C
review34
Review
  • In a class “C” address only the last octect is usable by the local administrator. (T/F)
  • True!
  • Each network connected to the Internet has the same network number. (T/F)
  • False!
  • In a class “B” address only the middle 2 octects are usable by the local administrator. (T/F)
  • False!