1. Addressing the Network – IPv4
CCNA Instructor Training
October 12-17, 2009

2. Network Layer Review A.1, A.2, B.1, B.3, ... are logical addresses A.1
Data A1 C7
A.1, A.2, B.1, B.3, ... are logical addresses
A.1
A.2
Network A
A.5
B.7
B.2
D.1
B.9
C.3 R1
B.1
Network B
B.6
B.3 R3 R2
C.2
Router
D.3
Network C
C.7
Network D
D.8

3. IP Addressing Structure

4. IP Addressing Structure
IPv4 Address

5. Subnet Mask
A method of specifying the network address portion of an IP address
Dot-decimal notation  e.g.,
CIDR notation  /18
Host Address
158
108
181
122
Subnet Mask
255
192
Network Address
128

6. Classify and Define IPv4 Addresses

7. Default Gateway
A router on a network that serves as the default access point to other networks
Network /24
Network /24

8. Assigning Addresses Static assignment Dynamic assignment
E.g., ask the network admin
Dynamic assignment
E.g., Dynamic Host Configuration Protocol (DHCP)

9. Testing the Network Layer

10. Testing the Network Layer
Use ping to verify that a local host can communicate with a gateway across a local area network