VLSM Asso Prof Dr Anan Phonphoem Department of

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VLSM Asso. Prof. Dr. Anan Phonphoem Department of Computer Engineering, Faculty of Engineering, Kasetsart

VLSM Asso. Prof. Dr. Anan Phonphoem Department of Computer Engineering, Faculty of Engineering, Kasetsart University, Bangkok, Thailand

VLSM n Variable-length subnet mask n Classful allows only one subnet in a network

VLSM n Variable-length subnet mask n Classful allows only one subnet in a network n > one subnet in an autonomous system n Maximizing the use of address (Subnet Zero) n “Subnetting a Subnet” n Routing that support VLSM n OSPF, Integrated IS-IS, EIGRP, RIPv 2, and static routing

Subnet with VLSM 192. 168. 10. 0/24

Subnet with VLSM 192. 168. 10. 0/24

Regular Subnet 192. 168. 10. 0/24 7 subnets; The largest subnet needs 60 hosts

Regular Subnet 192. 168. 10. 0/24 7 subnets; The largest subnet needs 60 hosts If 3 bits for subnet (8 subnets) 5 bits for host (32 hosts) If 6 bits for host (64 hosts) 2 bits for subnet (4 subnets)

Subnet with VLSM n Select the biggest first n 192. 168. 10. 0/24 n

Subnet with VLSM n Select the biggest first n 192. 168. 10. 0/24 n 192. 168. 10. 0/26 n 192. 168. 10. 64/26 n 192. 168. 10. 128/26 n 192. 168. 10. 192/26 n 192. 168. 10. 64/27 n 192. 168. 10. 96/27 n 192. 168. 10. 128/27 n 192. 168. 10. 192/27 Perth KL

Subnet with VLSM n 192. 168. 10. 96/27 n 192. 168. 10. 96/28 n

Subnet with VLSM n 192. 168. 10. 96/27 n 192. 168. 10. 96/28 n 192. 168. 10. 112/28 n 192. 168. 10. 128/28 n 192. 168. 10. 144/28 n 192. 168. 10. 128/30 n 192. 168. 10. 132/30 n 192. 168. 10. 136/30 n 192. 168. 10. 140/30 Sydney Singapore Perth – KL Sydney – KL Singapore – KL

Subnet with VLSM

Subnet with VLSM

Assignment 250 Stations 165. 23. 208. 0/20 CPE 700 Stations IE 500 Stations EE

Assignment 250 Stations 165. 23. 208. 0/20 CPE 700 Stations IE 500 Stations EE 100 Stations

250 Stations Solution • 165. 23. 208. 0/20 • 165. 23. 208. 0/22 •

250 Stations Solution • 165. 23. 208. 0/20 • 165. 23. 208. 0/22 • 165. 23. 212. 0/22 • 165. 23. 216. 0/22 • 165. 23. 220. 0/22 1022 Hosts • 165. 23. 212. 0/22 • 165. 23. 212. 0/23 510 Hosts • 165. 23. 214. 0/23 CPE IE EE 700 Stations 500 Stations 100 Stations The largest subnet needs 700 hosts 10 bits for host (1024 hosts) • 165. 23. 214. 0/23 • 165. 23. 214. 0/24 254 Hosts • 165. 23. 215. 0/24 • 165. 23. 215. 0/25 126 Hosts • 165. 23. 215. 128/25 2 Hosts • 165. 23. 215. 128/30 • 165. 23. 215. 132/30 • 165. 23. 215. 136/30 • …

Solution 165. 23. 214. 0/24 250 Stations 165. 23. 208. 0/20 CPE 165. 23.

Solution 165. 23. 214. 0/24 250 Stations 165. 23. 208. 0/20 CPE 165. 23. 215. 128/30 700 Stations 165. 23. 208. 0/22 IE 165. 23. 215. 132/30 500 Stations 165. 23. 212. 0/23 EE 100 Stations 165. 23. 215. 0/25

Route Aggregation n Route summarization n Supernetting n Possible only if routers of a

Route Aggregation n Route summarization n Supernetting n Possible only if routers of a network use a classless routing protocol (OSPF or EIGRP( n Carry 32 -bit IP address and bit mask in the routing updates n Share the same high-order bits

Local Area Network LAN Asso Prof Anan PhonphoemLocal Area Network LAN Asso Prof Anan Phonphoem
Router Basics Asso Prof Anan Phonphoem Ph DRouter Basics Asso Prof Anan Phonphoem Ph D
Basic Configuration Asso Prof Anan Phonphoem Ph DBasic Configuration Asso Prof Anan Phonphoem Ph D
Networking and Internetworking Devices Anan Phonphoem Ph DNetworking and Internetworking Devices Anan Phonphoem Ph D
Dr Islam Anan Biography Dr Islam Anan PharmacistDr Islam Anan Biography Dr Islam Anan Pharmacist
VLSM Variable Length Subnet Mask VLSM If youVLSM Variable Length Subnet Mask VLSM If you
Pertemuan6 Manajemen IP VLSM VLSM Subnetting Conventional SubnettingPertemuan6 Manajemen IP VLSM VLSM Subnetting Conventional Subnetting
VIBRATION DAMPERS Dr S Gandhi Asso Prof DepartmentVIBRATION DAMPERS Dr S Gandhi Asso Prof Department
Dr s v lamture Asso Prof Department ofDr s v lamture Asso Prof Department of
Access Control Lists ACLs Asst Prof Dr AnanAccess Control Lists ACLs Asst Prof Dr Anan