Cisco 2521LF - 2521LF Router Manuale Utente Pagina 25

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Copyright © 1997 Cisco Systems, Inc.
6-49CSE: Networking Fundamentals WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
172.16.14.32/27
172.16.14. 64/27
172.16.14.96/27
Subnet 172.16.14.0/24 is divided into smaller
subnets:
Subnet with one mask at first (/27)
Further subnet one of these subnets not used
elsewhere (/30)
C
C
B
B
A
A
HQ
HQ
172.16.1.0/24
172.16.2.0/24
HQ
HQ
172.16.0.0/16
172.16.14.136/30
172.16.14.132/30
172.16.14.140/30
What Is a Variable-Length
Subnet Mask?
What Is a Variable-Length
Subnet Mask?
6-50CSE: Networking Fundamentals WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
What Is Route
Summarization?
What Is Route
Summarization?
Routing protocols can summarize addresses of
several networks into one address
I can route to the
172.16.0.0/16 network.
Routing Table
172.16.0.0/16
B
B
Routing Table
172.16.25.0/24
172.16.26.0/24
172.16.27.0/24
172.16.27.0/24
172.16.26.0/24
172.16.25.0/24
A
A
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