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Ccna v5-S1-Chapter 9
1.
© 2008 Cisco
Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1 Chapter 9: Subnetting IP Networks Introduction to Networking
2.
Presentation_ID 2© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Chapter 9 9.1 Subnetting an IPv4 Network 9.2 Addressing Schemes 9.3 Design Considerations for IPv6 9.4 Summary
3.
Presentation_ID 3© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Chapter 9: Objectives Explain why routing is necessary for hosts on different networks to communicate. Describe IP as a communication protocol used to identify a single device on a network. Given a network and a subnet mask, calculate the number of host addresses available. Calculate the necessary subnet mask in order to accommodate the requirements of a network. Describe the benefits of variable length subnet masking (VLSM) Explain how IPv6 address assignments are implemented in a business network.
4.
Presentation_ID 4© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Network Segmentation Reasons for Subnetting Large networks need to be segmented into smaller sub-networks, creating smaller groups of devices and services in order to: Control traffic by containing broadcast traffic within subnetwork Reduce overall network traffic and improve network performance Subnetting - process of segmenting a network into multiple smaller network spaces called subnetworks or Subnets. Communication Between Subnets A router is necessary for devices on different networks and subnets to communicate. Each router interface must have an IPv4 host address that belongs to the network or subnet that the router interface is connected to. Devices on a network and subnet use the router interface attached to their LAN as their default gateway.
5.
Presentation_ID 5© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Subnetting an IPv4 Network IP Subnetting is FUNdamental
6.
Presentation_ID 6© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Subnetting an IPv4 Network Basic Subnetting Borrowing Bits to Create Subnets Borrowing 1 bit 21 = 2 subnets Subnet 1 Network 192.168.1.128-255/25 Mask: 255.255.255.128 Subnet 0 Network 192.168.1.0-127/25 Mask: 255.255.255.128 Borrowing 1 Bit from the host portion creates 2 subnets with the same subnet mask
7.
Presentation_ID 7© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Subnetting an IPv4 Network Subnets in Use Subnet 0 Network 192.168.1.0-127/25 Subnet 1 Network 192.168.1.128-255/25
8.
Presentation_ID 8© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Subnetting an IPv4 Network Subnetting Formulas Calculate Number of Subnets Calculate Number of Hosts
9.
Presentation_ID 9© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Subnetting an IPv4 Network Creating 4 Subnets Borrowing 2 bits to create 4 subnets. 22 = 4 subnets
10.
Presentation_ID 10© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Subnetting an IPv4 Network Creating 8 Subnets Borrowing 3 bits to Create 8 Subnets. 23 = 8 subnets
11.
Presentation_ID 11© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Subnetting an IPv4 Network Creating 8 Subnets(continued)
12.
Presentation_ID 12© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Determining the Subnet Mask Subnetting Based on Host Requirements There are two considerations when planning subnets: Number of Subnets required Number of Host addresses required Formula to determine number of useable hosts 2^n-2 2^n (where n is the number the number of host bits remaining) is used to calculate the number of hosts -2 Subnetwork ID and broadcast address cannot be used on each subnet
13.
Presentation_ID 13© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Determining the Subnet Mask Subnetting Network-Based Requirements Calculate number of subnets Formula 2^n (where n is the number of bits borrowed) Subnet needed for each department in graphic
14.
Presentation_ID 14© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Determining the Subnet Mask Subnetting To Meet Network Requirements It is important to balance the number of subnets needed and the number of hosts required for the largest subnet. Design the addressing scheme to accommodate the maximum number of hosts for each subnet. Allow for growth in each subnet.
15.
Presentation_ID 15© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Determining the Subnet Mask Subnetting To Meet Network Requirements (cont)
16.
Presentation_ID 16© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Benefits of Variable Length Subnet Masking Traditional Subnetting Wastes Addresses Traditional subnetting - same number of addresses is allocated for each subnet. Subnets that require fewer addresses have unused (wasted) addresses. For example, WAN links only need 2 addresses. Variable Length Subnet Mask (VLSM) or subnetting a subnet provides more efficient use of addresses.
17.
Presentation_ID 17© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Benefits of Variable Length Subnet Masking Variable Length Subnet Masks (VLSM) VLSM allows a network space to be divided in unequal parts. Subnet mask will vary depending on how many bits have been borrowed for a particular subnet. Network is first subnetted, and then the subnets are subnetted again. Process repeated as necessary to create subnets of various sizes.
18.
Presentation_ID 18© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Benefits of Variable Length Subnet Masking Basic VLSM
19.
Presentation_ID 19© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Benefits of Variable Length Subnet Masking VLSM in Practice Using VLSM subnets, the LAN and WAN segments in example below can be addressed with minimum waste. Each LANs will be assigned a subnet with /27 mask. Each WAN link will be assigned a subnet with /30 mask.
20.
Presentation_ID 20© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Benefits of Variable Length Subnet Masking VLSM Chart
21.
Presentation_ID 21© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Structured Design Planning to Address the Network Allocation of network addresses should be planned and documented for the purposes of: Preventing duplication of addresses Providing and controlling access Monitoring security and performance Addresses for Clients - usually dynamically assigned using Dynamic Host Configuration Protocol (DHCP) Sample Network Addressing Plan
22.
Presentation_ID 22© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Subnetting an IPv6 Network Subnetting Using the Subnet ID An IPv6 Network Space is subnetted to support hierarchical, logical design of the network
23.
Presentation_ID 23© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Subnetting an IPv6 Network IPV6 Subnet Allocation
24.
Presentation_ID 24© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Subnetting an IPv6 Network Subnetting into the Interface ID IPv6 bits can be borrowed from the interface ID to create additional IPv6 subnets
25.
Presentation_ID 25© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential Chapter 9: Summary Process of segmenting a network, by dividing it into to multiple smaller network spaces, is called subnetting. Subnetting a subnet, or using Variable Length Subnet Mask (VLSM) was designed to avoid wasting addresses. IPv6 address space is a huge address space so it is subnetted to support the hierarchical, logical design of the network not to conserve addresses. Size, location, use, and access requirements are all considerations in the address planning process. IP networks need to be tested to verify connectivity and operational performance.
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Presentation_ID 26© 2008
Cisco Systems, Inc. All rights reserved. Cisco Confidential
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