/ NETWORK

OSI 7 Layer

  1. IP Addressing

  2. Subnet mask

Subnet mask IP Network ID 와 Host ID 범위을 구분시킴 Classful & Classless 1 Bit의 개수로 표기 Ex) 255.255.255.224 11111111.1111111.1111111.11100000 -> /27

  1. IP Address Classes

Private IP Address Class A 10.x.x.x /8 Class B 172.16.x.x ~ 172.31.x.x /12 Class C 192.168.x.x /16 Class D (Multicast) EIGRP – 224.0.0.10 OSPF – 224.0.0.5 & 224.0.0.6 RiPv2 – 224.0.0.9

  1. Subnetting

128 64 32 16 8 4 2 1

0 128 192 224 240 248 252 254 255

  1. VLSM

  2. CIDR