Lecture 10. Subnetting & Supernetting
G.Bianchi G.Neglia
SUMMER/VOCATIONAL TRAINING-2021
2 Weeks (Basic) –Fundamentals of Networking Sub netting/ Super netting
(Cheat Sheet - Subnetting)
SUBNETTING packetlife.net. Subnet Chart. CIDR Subnet Mask. Addresses. Wildcard VLSM · Variable length subnet masks are an arbitrary length.
CIDR – VLSM – AS
Classless Interdomain Routing (CIDR). ? Variable Length Subnet Mask (VLSM). ? Autonomous System (AS) Example of CIDR (Supernetting).
• VLSM • CIDR • NAT
Advanced IP Addressing (Supernetting VLSM) VLSM. • Address Design Aspects. • CIDR ... if the major network is known by the router
Untitled
into Classless schemes – VLSM and CIDR. Variable Length Subnet Masking. Classless Inter-Domain Routing (Address Summarization. Supernetting
CIDR – VLSM – AS
Classless Interdomain Routing (CIDR). ? Variable Length Subnet Mask (VLSM). ? Autonomous System (AS) Example of CIDR (Supernetting).
Ip Addressing and Subnetting Workbook - Instructors Version v1_5
VLSM Variable-Length Subnet Mask IWorkbooks For your computer to determine the network and subnet portion of an IP address it must.
Subnetting Solved Examples Pdf
The remote hardware network and host assignment policy and supernetting. Cidr vs vlsm subnetting in all three bits from basic subnetting is the range ...
NOTICE
11 avr. 2022 VLSM CIDR
G.Bianchi, G.Neglia, V.Mancuso
Lecture 10.Lecture 10.
Subnetting
Subnetting& & SupernettingSupernetting
G.Bianchi, G.Neglia, V.Mancuso
OutlineOutline
Subnetting
Variable Length Subnet Mask (VLSM)
Supernetting
Classless Inter-Domain Routing (CIDR)
G.Bianchi, G.Neglia, V.Mancuso
medium org: N x class C? Class B?medium org: N x class C? Class B?Class C addresses:
Undersized (254
hosts)Class B addresses:
Much more than
enough (65534 hosts)N x class C:
Unwise: exponential
growth of routing tablesResult: Class B
addresses were largely preferredR2130.11.0.7
Net130.11.0.0
R3213.2.96.0
213.2.97.0
213.2.98.0
213.2.99.0
Corporate
destNext Hop
R2 Routing Table
130.11.0.0/16
Direct fwd
213.2.96.0/24
130.11.0.7
213.2.97.0/24
130.11.0.7
213.2.98.0/24
130.11.0.7
213.2.99.0/24
130.11.0.7
The aftermath: 10 bit class C design would have been much better...G.Bianchi, G.Neglia, V.Mancuso
Need for Need for subnettingsubnetting
Net_id-Host_id:
place host_id on physical network net_id131.175.0.1131.175.0.2
131.175.0.3
131.175.45.54
131.175.255.254
65534 hosts on a same physical network????
- performance? - management?CLASS B:From: 131.175.0.1
To: 131.175.255.254
G.Bianchi, G.Neglia, V.Mancuso
Idea: further hierarchy levelIdea: further hierarchy level subdivide a network in several subnetworks each subnet = a physical network (Ethernet, FDDI, X.25,ATM, Frame Relay, etc....)
Sub-NetRouter
Host131.175.21.0
EthernetFDDI
ATM131.175.21.4131.175.21.42
131.175.21.1
131.175.12.0131.175.12.12
131.175.12.33
131.175.12.34
131.175.12.254
131.175.33.0
May use third byte to identify subnet: 131.175.X.0 (or may notClass B network: 131.175.0.0
G.Bianchi, G.Neglia, V.Mancuso
Subnet creation and managementSubnet creation and managementInternet
InterNIC
Private
Network
Administrator
131.175.0.0
Give me a class B, please
131.175.0.0 for you!
131.175.12.0
131.175.12.0
131.175.21.0131.175.21.0
131.175.15.0131.175.15.0
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