3 IP Address 3 1 IP Address Overview

제 3 장. IP Address 3. 1 IP Address Overview 3. 2 IP Address Subnet 3. 3 VLSM 3. 4 DHCP 3. 5 NAT 3. 6 Private IP Address

3. 1 IP Address Overview IP Address 172. 18. 0. 1 172. 18. 0. 2 10. 13. 0. 0 10. 13. 0. 1 • • 172. 16. 0. 1 172. 16. 0. 2 SA DA DATA 172. 17. 0. 1 172. 17. 0. 2 192. 168. 1. 0 192. 168. 1. 1 Unique addressing 필요 Path choice is based on destination address.

3. 1 IP Address Overview IP Address 구조 부분 부분

3. 1 IP Address Overview IP Address Class 클래스 A 0 8 0 network 16 클래스 B 10 클래스 C 110 클래스 D 1110 멀티 캐스트 Group id 클래스 E 11110 미래용으로 예약 24 31 host network host

3. 1 IP Address Overview IP Address Class 1 Class A: 8 9 0 NNNNNNN 10 NNNNNN Host 32 Host 16 17 24 25 Network Host 32 Host (128 -191) 8 9 110 NNNNN 16 17 Network 24 25 Network 32 Host (192 -223) 1 Class D: Host 8 9 1 Class C: 24 25 (1 -126) 1 Class B: 16 17 8 9 1110 MMMM (224 -239) 32 Multicast Group ID

3. 1 IP Address Overview IP Address Class 1 Class A: 8 9 0 NNNNNNN 10 NNNNNN Host 32 Host 16 17 24 25 Network Host 32 Host (128 -191) 8 9 110 NNNNN 16 17 Network 24 25 Network 32 Host (192 -223) 1 Class D: Host 8 9 1 Class C: 24 25 (1 -126) 1 Class B: 16 17 8 9 1110 MMMM (224 -239) 32 Multicast Group ID

3. 1 IP Address Overview IP Addressing 172. 16. 2. 1 10. 1. 1. 1 e 1 10. 6. 24. 2 172. 16. 3. 10 10. 250. 8. 11 e 0 172. 16. 2. 1 172. 16. 12 10. 180. 30. 118 Routing Table 172. 16 Network . 12. 12 Host Network Interface 172. 16. 0. 0 E 0 10. 0 E 1

3. 1 IP Address Overview IP Address 할당 172. 16. 0. 1 172. 16. 0. 2 172. 16. 0. 3 172. 16. 255. 254 …. . . 172. 16. 0. 0 • Network 172. 16. 0. 0

3. 2 IP Address Subnetworking 172. 16. 3. 0 172. 16. 4. 0 172. 16. 1. 0 • Network 172. 16. 0. 0 172. 16. 2. 0

3. 2 IP Address Subnetworking 172. 16. 2. 200 172. 16. 3. 5 e 1 172. 16. 3. 1 172. 16. 2. 2 172. 16. 3. 100 e 0 172. 160 172. 16 Network . 2 Subnet 172. 16. 3. 150 . 160 Host Routing Table Network Interface 172. 16. 2. 0 E 0 172. 16. 3. 0 E 1

3. 2 IP Address Subnet mask Network IP Address 172 Host 16 0 Network Default Subnet Mask 255 1111 Host 255 1111 Network 8 -bit Subnet 0 00000000 Subnet Host 255 255 0 11111111 0000 /16 /24

3. 2 IP Address Subnet Broadcast Address 172. 16. 3. 0 172. 16. 4. 0 172. 16. 1. 0 172. 16. 2. 0 172. 16. 3. 255 (Directed broadcast) 255 (Local network broadcast) 172. 16. 255 (All subnets broadcast) X

3. 2 IP Address Subnet IP address 요약 172 160 255 255 192 (3) 172. 160 10101100 000100000010 10100000 Host (1) 255. 192 11111111 11000000 Mask (2) 172. 16. 2. 128 10101100 000100000010 10000000 Subnet (4) 172. 16. 2. 191 10101100 00010000 172. 16. 2. 129 10101100 00010000 (5) 00000010 10111111 Broadcast 5 (6) 00000010 10000001 First 172. 16. 2. 190 10101100 000100000010 10111110 Last (8) (7)

3. 2 IP Address Subnet mask Bit 수 subnet mask 1 2 255. 128 subnet 수 host 수 255. 192 2 4 126 62 3 255. 224 8 30 4 255. 240 16 14 5 255. 248 255. 252 32 64 6 2 6

3. 3 VLSM 203. 251. 1. 0/24 203. 251. 1. 0 /25 120 SYS 60 SYS 203. 251. 1. 128 /26 • Variable Length Subnet Mask 60 SYS 203. 251. 1. 192 /26

3. 4 DHCP Client DHCP Reply DHCP Request Your IP is … Your Gateway is. . DHCP Client DHCP Server • Dynamic Host Configuration Protocol

3. 5 NAT Private (4) DA 198. 168. 2. 2 10. 1. 1. 3 (5) DA 10. 1. 1. 1 (3) Host B 172. 20. 3. 3 SA 198. 168. 2. 2 Internet 10. 1. 1. 2 R 1 10. 1. 1. 2 SA 10. 1. 1. 1 Host A 10. 1. 1. 1 (1) (2) NAT table Private IP Address 10. 1. 1. 3 10. 1. 1. 2 10. 1. 1. 1 Global IP Address 198. 168. 2. 4 198. 168. 2. 3 198. 168. 2. 2

3. 6 Private IP Address • • • A class – 10. 0 10. 255 (10. 0 /8) B class – 172. 16. 0. 0 172. 31. 255 (172. 16. 0. 0 /12) C class – 192. 168. 0. 0 192. 168. 255 (192. 168. 0. 0 /16)