CCNA v6.0 ITN - Chapter 07

Instructor Materials
Chapter 7: IP Addressing
CCNA Routing and Switching
Introduction to Networks v6.0

3© 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential
Introduction to Networks 6.0 Planning
Guide

CCNA Routing and Switching
Introduction to Networks v6.0

 7.1 IPv4 Network Addresses
 Explain the use of IPv4 addresses to provide connectivity in small to medium-sized business networks
• Convert between binary and decimal numbering systems.
• Describe the structure of an IPv4 address including the network portion, the host portion, and the subnet
mask.
• Compare the characteristics and uses of the unicast, broadcast and multicast IPv4 addresses.
• Explain public, private, and reserved IPv4 addresses.
 7.2 IPv6 Network Addresses
 Configure IPv6 addresses to provide connectivity in small to medium-sized business networks.
• Explain the need for IPv6 addressing.
• Describe the representation of an IPv6 address.
• Compare types of IPv6 network addresses.
• Configure global unicast addresses.
• Describe multicast addresses.
Chapter 7 - Sections & Objectives

 7.3 Connectivity Verification
 Use common testing utilities to verify and test network connectivity.
• Explain how ICMP is used to test network connectivity.
• Use ping and traceroute utilities to test network connectivity.
Chapter 7 - Sections & Objectives (Cont.)

7.1 IPv4 Network Addresses

 Binary numbering system consists of the numbers 0 and 1 called bits
• IPv4 addresses are expressed in 32 binary bits divided into 4 8-bit octets
Binary and Decimal Conversion
IPv4 Addresses

 IPv4 addresses are commonly expressed in dotted decimal notation
IPv4 Addresses (Cont.)

 This video will cover the process of
ANDing as it relates to discovering the
network address, the host addresses, and
the broadcast address in an IPv4 network.
Binary and Decimal Conversation
Video Demonstration – Converting Between Binary and Decimal
Numbering Systems

 The first row identifies the number base
or radix. Decimal is 10. Binary is based
on 2, therefore radix will be 2
 The 2nd row considers the position of
the number starting with 0. These
numbers also represent the exponential
value that will be used to calculate the
positional value (4th row).
 The 3rd row calculates the positional
value by taking the radix and raising it
by the exponential value of its position.
Note: n^0 is always = 1.
 The positional value is listed in the
fourth row.
Positional Notation
Applying decimal positional notation

Positional Notation (Cont.)
 Applying binary positional notation.

 To convert a binary IPv4 address to decimal enter the 8-bit binary number of each octet under the
positional value of row 1 and then calculate to produce the decimal.
Binary to Decimal Conversion

 To convert a decimal IPv4address
to binary use the positional chart
and check first if the number is
greater than the 128 bit. If no a 0 is
placed in this position. If yes then a
1 is placed in this position.
 128 is subtracted from the original
number and the remainder is then
checked against the next position
(64) If it is less than 64 a 0 is placed
in this position. If it is greater, a 1 is
placed in this position and 64 is
subtracted.
 The process repeats until all
positional values have been
entered.
Decimal to Binary Conversion

Decimal to Binary Conversion Examples

 An IPv4 address is hierarchical.
• Composed of a Network portion
and Host portion.
 All devices on the same network
must have the identical network
portion.
 The Subnet Mask helps devices
identify the network portion and
host portion.
IPv4 Address Structure
Network and Host Portions

 Three IPv4 addresses must be
configured on a host:
• Unique IPv4 address of the host.
• Subnet mask - identifies the
network/host portion of the IPv4
address.
• Default gateway -IP address of the
local router interface.
The Subnet Mask

The Subnet Mask (Cont.)
 The IPv4 address is compared to the subnet mask bit by bit, from left to right.
 A 1 in the subnet mask indicates that the corresponding bit in the IPv4 address is a
network bit.

Logical AND
 A logical AND is one of three
basic binary operations used in
digital logic.
 Used to determine the Network
Address
 The Logical AND of two bits yields
the following results:

The Prefix Length
 The Prefix Length:
• Shorthand method of
expressing the subnet mask.
• Equals the number of bits in
the subnet mask set to 1.
• Written in slash notation, /
followed by the number of
network bits.

Network, Host, and Broadcast Addresses
 Types of Addresses in Network
192.168.10.0/24
• Network Address - host portion is all 0s
(.00000000)
• First Host address - host portion is all 0s
and ends with a 1 (.00000001)
• Last Host address - host portion is all 1s
and ends with a 0 (.11111110)
• Broadcast Address - host portion is all
1s (.11111111)

Video Demonstration - Network, Host, and Broadcast Addresses
 This video will cover the process of
ANDing as it relates to discovering
the network address, the host
addresses, and the broadcast
address in an IPv4 network.

Lab – Using the Windows Calculator with Network Addresses

Lab – Converting IPv4 Addresses to Binary

IPv4 Unicast, Broadcast, and Multicast
Static IPv4 Address Assignment to a Host
 Some devices like printers, servers
and network devices require a fixed
IP address.
 Hosts in a small network can also be
configured with static addresses.

Dynamic IPv4 Address Assignment to a Host
 Most networks use Dynamic Host
Configuration Protocol (DHCP) to
assign IPv4 addresses dynamically.
 The DHCP server provides an IPv4
address, subnet mask, default
gateway, and other configuration
information.
 DHCP leases the addresses to hosts
for a certain length of time.
 If the host is powered down or taken
off the network, the address is
returned to the pool for reuse.

IPv4 Communication
 Unicast – one to one
communication.
 Broadcast– one to
all.
 Multicast – one to a
select group.

Unicast Transmission
 Unicast – one to one
communication.
• Use the address of the
destination device as the
destination address.

Broadcast Transmission
 Broadcast– one to all
• Message sent to everyone in the
LAN (broadcast domain.)
• destination IPv4 address has all
ones (1s) in the host portion.

Multicast Transmission
 Multicast– one to a select group.
• 224.0.0.0 to 239.255.255.255
addresses reserved for multicast.
• routing protocols use multicast
transmission to exchange routing
information.

Packet Tracer – Investigate Unicast, Broadcast, and Multicast Traffic

Types of IPv4 Addresses
Public and Private IPv4 Addresses
 Private Addresses
• Not routable
• Introduced in mid 1990s due to depletion of IPv4
addresses
• Used only in internal networks.
• Must be translated to a public IPv4 to be routable.
• Defined by RFC 1918
 Private Address Blocks
• 10.0.0.0 /8 or 10.0.0.0 to 10.255.255.255
• 172.16.0.0 /12 or 172.16.0.0 to
172.31.255.255192.168.0.0 /16
• 192.168.0.0 to 192.168.255.255

Special User IPv4 Addresses
 Loopback addresses (127.0.0.0 /8 or
127.0.0.1)
• Used on a host to test if the TCP/IP
configuration is operational.
 Link-Local addresses (169.254.0.0 /16 or
169.254.0.1)
• Commonly known as Automatic Private IP
Addressing (APIPA) addresses.
• Used by Windows client to self configure if no
DHCP server available.
 TEST-NET addresses (192.0.2.0/24 or 192.0.2.0 to
192.0.2.255)
• Used for teaching and learning.

Legacy Classful Addressing
 In 1981, Internet IPv4 addresses were
assigned using classful addressing (RFC 790)
 Network addresses were based on 3 classes:
• Class A (0.0.0.0/8 to 127.0.0.0/8) – Designed to
support extremely large networks with more than
16 million host addresses.
• Class B (128.0.0.0 /16 – 191.255.0.0 /16) –
Designed to support the needs of moderate to
large size networks up to approximately 65,000
host addresses.
• Class C (192.0.0.0 /24 – 223.255.255.0 /24) –
Designed to support small networks with a
maximum of 254 hosts.

Video Demonstration - Classful IPv4 Addressing
 Discussion of Classful Addressing
• Identifying a Classful address by the IP
address and the subnet mask

Classless Addressing
 Classful Addressing wasted addresses
and exhausted the availability of IPv4
addresses.
 Classless Addressing Introduced in the
1990s
• Classless Inter-Domain Routing (CIDR,
pronounced “cider”)
• Allowed service providers to allocate IPv4
addresses on any address bit boundary
(prefix length) instead of only by a class A,
B, or C.

Assignment of IP Addresses
 The following organizations manage and
maintain IPv4 and IPv6 addresses for the
various regions.
• American Registry for Internet Numbers
(ARIN)- North America.
• Réseaux IP Europeans (RIPE) - Europe, the
Middle East, and Central Asia
• Asia Pacific Network Information Centre
(APNIC) - Asia and Pacific regions
• African Network Information Centre (AfriNIC) –
Africa
• Regional Latin-American and Caribbean IP
Address Registry (LACNIC) - Latin America
and some Caribbean islands

Lab – Identifying IPv4 Addresses

7.2 IPv6 Network Addresses

IPv4 Issues
The Need for IPv6
 IPv6 versus IPv4:
• Has a larger 128-bit address space
• 340 undecillion addresses
• Solves limitations with IPv4
• Adds enhancement like address auto-
configuration.
 Why IPv6 is needed:
• Rapidly increasing Internet
population
• Depletion of IPv4
• Issues with NAT
• Internet of Things

IPv4 Issues
IPv4 and IPv6 Coexistence
 Migration from IPv4 to IPv6 Techniques
Translation - Network
Address Translation 64
(NAT64) allows IPv6-enabled
devices to communicate with
IPv4 devices.
Tunneling - The IPv6
packet is encapsulated
inside an IPv4 packet.
Dual stack - Devices
run both IPv4 and IPv6
protocol stacks
simultaneously.

IPv6 Addressing
IPv6 Address Representation
 IPv6 Addresses:
• 128 bits in length
• Every 4 bits is represented by a
single hexadecimal digit
• Hextet - unofficial term referring to a
segment of 16 bits or four
hexadecimal values.

IPv6 Addressing
IPv6 Address Representation (Cont.)
 Preferred format for IPv6 representation

IPv6 Addressing
Rule 1 – Omit Leading 0s
 In order to reduce or compress IPv6
• First rule is to omit leading zeros in any hextet.

IPv6 Addressing
Rule 2 – Omit All 0 Segments
 Rule 2 – Omit All 0 Segments
• A double colon (::) can replace any single, contiguous
string of one or more 16-bit segments (hextets) consisting
of all 0s.

IPv6 Addressing
Rule 2 – Omit All 0 Segments (Cont.)
 Rule 2 – Omit All 0 Segments
• A double colon (::) can replace any single, contiguous
string of one or more 16-bit segments (hextets) consisting
of all 0s.

IPv6 Address Types
 Three types of IPv6 addresses:
• Unicast- Single source IPv6
address.
• Multicast - An IPv6 multicast
address is used to send a single
IPv6 packet to multiple destinations.
• Anycast - An IPv6 anycast address
is any IPv6 unicast address that can
be assigned to multiple devices.

IPv6 Prefix Length
 The IPv6 prefix length is used to indicate the network portion of an IPv6 address:
• The prefix length can range from 0 to 128.
• Typical IPv6 prefix length for most LANs is /64

IPv6 Unicast Addresses
 Global Unicast - These are
globally unique, Internet
routable addresses.
 Link-local - used to
communicate with other
devices on the same local
link. Confined to a single
link.
 Unique Local - used for
local addressing within a site
or between a limited number
of sites.

IPv6 Link-Local Unicast Addresses
 IPv6 link-local addresses:
• Enable a device to communicate
with other IPv6-enabled devices
on the same link only.
• Are created even if the device
has not been assigned a global
unicast IPv6 address.
• Are in the FE80::/10 range.
Note: Typically, it is the link-local address
of the router that is used as the default
gateway for other devices on the link.

Structure of an IPv6 Global Unicast Address
 A global unicast address has
three parts:
• Global routing prefix - network,
portion of the address that is
assigned by the provider.
Typically /48.
• Subnet ID – Used to subnet
within an organization.
• Interface ID - equivalent to the
host portion of an IPv4 address.
 Currently, only global unicast
addresses with the first three
bits of 001 or 2000::/3 are being
assigned

Static Configuration of a Global Unicast Address
 Router Configuration:
 Similar commands to IPv4,
replace IPv4 with IPv6
 Command to configure andIPv6
global unicast on an interface is
ipv6 address ipv6-
address/prefix-length

Static Configuration of a Global Unicast Address (Cont.)
 Host Configuration:
• Manually configuring the IPv6 address
on a host is similar to configuring an
IPv4 address
• Default gateway address can be
configured to match the link-local or
global unicast address of the Gigabit
Ethernet interface.
 Dynamic assignment of IPv6
addresses:
• Stateless Address Autoconfiguration
(SLAAC)
• Stateful DHCPv6

Dynamic Configuration - SLAAC
 Stateless Address
Autoconfiguration (SLAAC):
• A device can obtain its prefix, prefix
length, default gateway address,
and other information from an IPv6
router.
• Uses the local router’s ICMPv6
Router Advertisement (RA)
messages
 ICMPv6 RA messages sent every
200 seconds to all IPv6-enabled
devices on the network.
Option 1 (SLAAC Only) – "I'm everything you need (Prefix,
Prefix-length, Default Gateway)"
Option 2 (SLAAC and DHCPv6) – "Here is my information
but you need to get other information such as DNS
addresses from a DHCPv6 server."
Option 3 (DHCPv6 Only) – "I can’t help you. Ask a DHCPv6
server for all your information."

Dynamic Configuration – DHCPv6
 The RA Option 1: SLAAC only (this is
the default)
 RA Option 2: SLAAC and Stateless
DHCPv6:
• Uses SLAAC for IPv6 global unicast
address and default gateway.
• Uses a stateless DHCPv6 server for other
information.
 RA Option 3: Stateful DHCPv6
• Uses the Routers link-local address for
the default gateway.
• Uses DHCPv6 for all other information.

EUI-64 Process and Randomly Generated
 When the RA message is SLAAC or
SLAAC with stateless DHCPv6, the client
must generate its own Interface ID
• The Interface ID can be created using the
EUI-64 process or a randomly generated 64-
bit number
 An EUI-64 Interface ID is represented in
binary and is made up of three parts:
• 24-bit OUI from the client MAC address, but
the 7th bit (the Universally/Locally (U/L) bit)
is reversed.
• The inserted 16-bit value FFFE (in
hexadecimal).
• 24-bit Device Identifier from the client MAC
address.

EUI-64 Process and Randomly Generated (Cont.)
 Randomly Generated Interface IDs
• Windows uses a randomly generated Interface ID

Dynamic Link-Local Addresses
 Link-local address can be established dynamically or configured manually.
 Cisco IOS routers use EUI-64 to generate the Interface ID for all link-local address on IPv6
interfaces.
 Drawback to using the dynamically assigned link-local address is the long interface ID, therefore
they are often configured statically.

Static Link-Local Addresses
 Manual Configuration of the link-local address allows the creation of a simple, easy to
remember address.

Verifying IPv6 Address Configuration
 The commands to verify IPv6 configuration are similar to IPv4
• show ipv6 interface brief
• show ipv6 route
 The ping command for IPv6 is identical to the command used with IPv4, except that
an IPv6 address is used.

Packet Tracer – Configuring IPv6 Addressing

IPv6 Multicast Addresses
Assigned IPv6 Multicast Addresses
 There are two types of IPv6 multicast
addresses:
• Assigned multicast - reserved multicast
addresses for predefined groups of devices
• Solicited node multicast
 Two common IPv6 assigned multicast
groups:
• FF02::1 All-nodes multicast group – This is
a multicast group that all IPv6-enabled
devices join. Similar to a broadcast in IPv4
• FF02::2 All-routers multicast group – This is
a multicast group that all IPv6 routers join.

Solicited-Node IPv6 Multicast Addresses
 Solicited-node multicast address:
• Mapped to .a special Ethernet multicast address
• Allows Ethernet NIC to filter frame on destination
MAC.

Lab – Identifying IPv6 Addresses

Lab – Configuring IPv6 Addresses on Network Devices

7.3 Connectivity Verification

ICMP
ICMPv4 and ICMPv6
 ICMPv4 is the messaging protocol for
IPv4. ICMPv6 provides the same
services for IPv6
 ICMP messages common to both
include:
• Host confirmation
• Destination or Service Unreachable
• Time exceeded
• Route redirection

ICMP
ICMPv6 Router Solicitation and Router Advertisement Messages
 ICMPv6 includes four new protocols as part
of the Neighbor Discovery Protocol (ND or
NDP)
• Router Solicitation (RS) message
• Router Advertisement (RA) message
 RA messages used to provide addressing
information to hosts
• Neighbor Solicitation (NS) message
• Neighbor Advertisement (NA) message
 Neighbor Solicitation and Neighbor
Advertisement messages are used for
Address resolution and Duplicate Address
Detection (DAD).

Testing and Verification
Ping - Testing the Local Stack
 Ping the local loopback address of
127.0.0.1 for IPv4 or ::1 for IPv6 to
verify that IP is properly installed on the
host.

Ping – Testing Connectivity to the Local LAN
 Use ping to test the ability of a host
to communicate on the local
network.

Ping – Testing Connectivity to a Remote Host
 Use ping to test the ability of a host
to communicate across an
internetwork.

Traceroute – Testing the Path
 Traceroute (tracert) is a utility that
generates a list of hops that were
successfully reached along the path.
• Round Trip Time (RTT) – Time it takes
the packet to reach the remote host
and for the response from the host to
return.
• Asterisk (*) is used to indicate a lost
packet.

Packet Tracer – Verifying IPv4 and IPv6 Addressing

Packet Tracer – Pinging and Tracing to Test the Path

Lab – Testing Network Connectivity with Ping and Traceroute

Lab – Mapping the Internet

Packet Tracer – Troubleshooting IPv4 and IPv6 Addressing

7.4 Chapter Summary

Conclusion
Packet Tracer – Skills Integration Challenge

Conclusion
 Explain the use of IPv4 addresses to provide connectivity in small to
medium-sized business networks
 Configure IPv6 addresses to provide connectivity in small to
medium-sized business networks.
 Use common testing utilities to verify and test network connectivity.

CCNA v6.0 ITN - Chapter 07

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