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[CISCO2]_#03_[Routing protocol, Routing table, Static Routing protocol, Dynamic Routing Protocol, Distance Vector, Link-State, RIP, IGRP, OSPF, IS-IS, Default Routing Protocol] - Router์˜ ์ฃผ๋ชฉ์  ์ค‘ ํ•˜๋‚˜๋Š” Routing. *Routing : Packet์„ ์ˆ˜์‹ ํ–ˆ์„ ๋•Œ Best Path(์ตœ์  ๊ฒฝ๋กœ)๋ฅผ ์ฐพ์•„์„œ ์–ด๋Š ๊ฒฝ๋กœ๋กœ ์ „์†กํ•  ์ง€ ๊ฒฐ์ •ํ•˜๊ณ  ๋ณด๋‚ด๋Š” ๊ฒƒ. - Router๋Š” Packet์„ Forwarding ํ•  ๋•Œ Routing table์„ ํ™•์ธํ•˜๊ณ  ์ „์†ก. - Routing table์— ์˜ฌ๋ผ์˜จ ๊ฒฝ๋กœ๊ฐ€ Best Path์ด๋‹ค.(Best Path๋งŒ์„ ๋ผ์šฐํŒ… ํ…Œ์ด๋ธ”์— ์˜ฌ๋ฆผ.) - ๊ฒฝ๋กœ๊ฐ€ ์—ฌ๋Ÿฌ๊ฐœ์ธ ๊ฒฝ์šฐ, Best Path๋งŒ์„ Routing table์— ์˜ฌ๋ฆฌ๊ณ  ๋‚˜๋จธ์ง€ ๊ฒฝ๋กœ๋“ค์€ ๋ฐ์ดํ„ฐ ๋ฒ ์ด์Šค์— ์ €์žฅํ•œ๋‹ค. - Switch๋Š” ๋ชฉ์ ์ง€๋ฅผ ๋ชจ๋ฅด๋Š” Frame์„ Floodingํ•˜์ง€๋งŒ, Router๋Š” ๋ชฉ์ ์ง€๋ฅผ ๋ชจ๋ฅด๋Š” Packet์„ Drop์‹œํ‚จ๋‹ค. - ์ฆ‰, Routing table์— ๋ชฉ์ ์ง€์˜ ์ •๋ณด๊ฐ€ ์—†๋Š” .. 2021. 8. 15.
[CISCO2]_#02_[VLAN, Access port, Trunk port, VTP, Inter VLAN, Cisco ์ „์šฉ protocol, CDP, NAT, PAT, DHCP] (1) Access Port - ํ•˜๋‚˜์˜ port๊ฐ€ ํ•˜๋‚˜์˜ vlan์— ์†ํ•œ ๊ฒฝ์šฐ. - ์ฆ‰, ํ•ด๋‹น ํฌํŠธ๋Š” ์ž์‹ ์ด ์†ํ•œ VLAN ๋„คํŠธ์›Œํฌ Frame๋งŒ์„ ์ „์†กํ•  ์ˆ˜ ์žˆ๋‹ค. - L3 ์žฅ๋น„๋ฅผ ๊ฑฐ์น˜์ง€ ์•Š์„ ๊ฒฝ์šฐ ๊ฐ™์€ VLAN์— ํ• ๋‹น๋œ Interface์— ์ ‘์†๋œ ์žฅ๋น„๋“ค๋ผ๋ฆฌ๋งŒ ํ†ต์‹ ์ด ๊ฐ€๋Šฅ. (2) Trunk Port - ํ•˜๋‚˜์˜ Port์— ์—ฌ๋Ÿฌ๊ฐœ์˜ VLAN Frame์ด ํ˜๋Ÿฌ๋‹ค๋‹ ์ˆ˜ ์žˆ๋„๋ก ํ•˜๋Š” ๊ฒฝ์šฐ. - Switch ์™€ Switch๊ฐ€ ํ•˜๋‚˜์˜ Port๋กœ ์—ฐ๊ฒฐ๋ผ ์žˆ๋Š” ๊ฒฝ์šฐ, ํ•ด๋‹น port์— switch์— ์„ค์ •๋œ ์—ฌ๋Ÿฌ๊ฐœ์˜ vlan frame์ด ๋ชจ๋‘ ํ˜๋Ÿฌ๋‹ค๋…€์•ผ ๋‘ ๋Œ€์˜ switch ์— ์„ค์ •๋œ ๊ฐ vlan๋ณ„๋กœ ํ†ต์‹ ์ด ๊ฐ€๋Šฅ. - ์ฆ‰, ๋‹ค์ˆ˜์˜ ๊ฐ™์€ vlan์ด ์—ฌ๋Ÿฌ๊ฐœ์˜ switch์— ์กด์žฌํ•  ๊ฒฝ์šฐ trunk port๋ฅผ ํ†ตํ•ด ๊ฐ switc.. 2021. 8. 15.
[CISCO2]_#01_[์Šค์œ„์น˜์™€ ๋ผ์šฐํ„ฐ ์ฐจ์ด, ์Šค์œ„์น˜์˜ ์ „์†ก๋ฐฉ์‹, store and forward, cut-through, fragment-free, ethernet header, Transparent Bridging, ์Šค์œ„์น˜์˜ 5๋Œ€ ๊ธฐ๋Šฅ, ์ด์ค‘๊ตฌ์กฐ์˜ ๋ฌธ์ œ์ , ๋ฃจํ•‘, RSTP, STP, BPDU, Root ID, Path Cos.. - Switch๋Š” Layer 2 Switch ์™€ Multi Layer Switch(L3 Switch) ๋กœ ๊ตฌ๋ถ„๋œ๋‹ค. - CCNA ์‹œ๊ฐ„์€ Layer 2 Switch.(Data link ๊ณ„์ธต) - Layer 2 Switch๋Š” ํฌํŠธ๋ณ„๋กœ Collision domain(์ถฉ๋Œ ๋„๋ฉ”์ธ)์„ ๋‚˜๋ˆˆ๋‹ค. **๋ผ์šฐํ„ฐ์™€์˜ ์ฐจ์ด์  : (1) Router๋Š” CPU-base(policy-base) ์ด๊ณ (์†Œํ”„ํŠธ์›จ์–ด ๊ธฐ๋ฐ˜), Switch๋Š” ASIC(Application-Specific Integrated Cicuit)์นฉ ๊ธฐ๋ฐ˜(ํ•˜๋“œ์›จ์–ด ๊ธฐ๋ฐ˜)์ด๋‹ค. (2) Router๋Š” Routing table, ARP-table์„ ํ™•์ธ(IP address)ํ•˜๊ณ , Switch๋Š” MAC address table์„ ํ™•์ธ(MAC address) (3) Rout.. 2021. 8. 12.
[CISCO1]_#18_[port address translation, PAT, ๋ผ์šฐํ„ฐ์—์˜ SSH, ์Šค์œ„์น˜์—์˜ SSH, FTP, #do sh int] (port address translation) Router(config)# Router(config)#ip nat pool korea 1.1.12.1 1.1.12.1 net 255.255.255.0 // ๊ณต์ธ ip๋ฅผ ํ•˜๋‚˜๋งŒ ๋งŒ๋“ฌ. ...(1) Router(config)# Router(config)#access-list 1 permit 192.168.10.0 0.0.0.255 // ์‚ฌ์  ip pool์„ ๋งŒ๋“ฌ. ...(2) Router(config)# Router(config)#ip nat inside source list 1 pool koera overload // ๊ณต์ธ ์‚ฌ์„ค์„ ๋งคํ•‘ ์‹œํ‚ด. ...(3) Router(config)# Router(config)#interface fastEthernet 0/0.. 2021. 8. 11.
[CiSCO1]_#17_[DHCP, #ip helper-address, NAT, Dynamic NAT, Static NAT, PAT, #ip nat inside source static] Router(config)# Router(config)#interface fastEthernet 0/0 Router(config-if)# Router(config-if)#ip helper-address 192.168.10.1 // ํ•ด๋‹น๋ผ์šฐํ„ฐ๋กœ ๊ฐ€์„œ ip๋ฅผ ๋ฐ›์•„์™€๋ผ. ใ…กใ…กใ…กใ…กใ…ก ์ด๋Ÿฐ ๋ฐฉ์‹์œผ๋กœ Router์— dhcp์„œ๋ฒ„๋ฅผ ๋งŒ๋“ค์–ด์ฃผ์ง€ ์•Š๊ณ  ๋”ฐ๋กœ server๋ฅผ ๋งŒ๋“ค์–ด์„œ ip๋ฅผ ๋ถ€์—ฌํ•  ์ˆ˜ ๋„ ์žˆ๋‹ค. [ NAT (Network Address Translation) ] - ๋„คํŠธ์›Œํฌ ์ฃผ์†Œ ๋ณ€ํ™˜ ๊ธฐ์ˆ .(์‚ฌ์„คip -> ๊ณต์ธ ip) 01. ์ข…๋ฅ˜ : (1) NAT -> ip๋ฅผ ์กฐ๊ธˆ ํšจ์œจ์ ์œผ๋กœ ์‚ฌ์šฉ (๊ฒฝ์šฐ์—๋”ฐ๋ผ ๋‹ค๋ฅด๊ฒŒ ์ง์ง€์„ ์ˆ˜ ์žˆ๊ธฐ์—), -> ๋ณด์•ˆ ๊ฐ•ํ™”(๋ฐฉํ™”๋ฒฝ) -> ๋‚ด๋ถ€์—์„œ ์™ธ๋ถ€๋กœ๋Š” ๊ฐˆ ์ˆ˜ ์žˆ์ง€๋งŒ, ์™ธ๋ถ€์—์„œ ๋‚ด๋ถ€๋กœ๋Š” ์ ‘์†๋ถˆ.. 2021. 8. 9.
[CISCO1]_#16_[port security, telnet์›๊ฒฉ ์ ‘์†, Switch LAN ํ™˜๊ฒฝ ๊ตฌ์ถ•, DHCP ์„ค์ •] [port security] - ์„ค์ • ๋ฐฉ์‹ : 01. ์ตœ๋Œ€ ์—ฐ๊ฒฐ ํฌํŠธ ๊ฐœ์ˆ˜ ์„ค์ •. 02. ์ง์ ‘ ์—ฐ๊ฒฐ ๊ฐ€๋Šฅ MAC ์ฃผ์†Œ ์„ค์ •. --> Switch(config)#interface f Switch(config)#interface fastEthernet 0/23 // fa0/23์œผ๋กœ ์ ‘์†. Switch(config-if)# Switch(config-if)#switchport mode access // accessํฌํŠธ๋กœ ์ „ํ™˜. ...(1) Switch(config-if)# Switch(config-if)#switchport port-security ? aging Port-security aging commands mac-address Secure mac address maximum Max secure addre.. 2021. 8. 5.
[CISCO1]_#15_[STP, spanning tree protocol, BPDU, loopin, ๋ฃจํ•€ํ˜„์ƒ, sh span, root ๋ธŒ๋ฆฟ์ง€, priority, Address, spanning-tree vlan 1 priority 4096, Desg, root, Ether channel, channel-group 1 mode on ] ์Šค์œ„์น˜๋ผ๋ฆฌ ์ผ€์ด๋ธ” ๋‘๊ฐœ ์—ฐ๊ฒฐ์‹œ์˜ ์ฃผํ™ฉ๋ถˆ -> ํ•œ์ชฝ์€ ์ฃผํ™ฉ๋ถˆ๋กœ ๋ง‰์•„์ง. -> ์—ฌ๋Ÿฌ ๊ฐœ ์—ฐ๊ฒฐํ•ด๋„ ํ•˜๋‚˜๋งŒ ์˜จ์ „ํžˆ ์—ฐ๊ฒฐ๋จ. [STP (spanning tree protocol)] : ๊ธฐ๋Šฅ : - BPDU๋ผ๋Š” ๋ฐ์ดํ„ฐ ๋‹จ์œ„๋ฅผ ์ฃผ๊ณ ๋ฐ›์œผ๋ฉด์„œ ํ†ต์‹ . - (BPDU์— ๊ฐ ์Šค์œ„์น˜์˜ ์—ฌ๋Ÿฌ ์ •๋ณด๊ฐ€ ๋“ค์–ด์žˆ์Œ -> ์ด๋ฅผ ํ†ตํ•ด root ๋ธŒ๋ฆฟ์ง€๋ฅผ ์ž๋™ ์„ ๋ฐœ) - BPDU์—๋Š” ํฌํŠธ ์ •๋ณด๋„ ๋“ค์–ด์žˆ๊ธฐ ๋•Œ๋ฌธ์— ์ด๋ฅผ ๊ตํ™˜ํ•ด์„œ ์šฐ์„ ์ˆœ์œ„๊ฐ€ ๋‚ฎ์€ ํฌํŠธ๋ฅผ ๋ธ”๋กํ‚น(์ฃผํ™ฉ๋ถˆ)ํ•˜์—ฌ loopin(๋ฃจํ•‘)์„ ๋ง‰๋Š”๋‹ค. ** loopin(๋ฃจํ•‘) : ํ†ต์‹ ์ด ์—ฐ๊ฒฐ๋˜์ง€ ์•Š๊ณ  ๊ณ„์† ๋งด๋„๋Š” ํ˜„์ƒ. ** ใ…กใ…กใ…กใ…กใ…ก SW#sh span -> This bridge is the root ๋ผ๋Š” ๋ง์ด ์ ํ˜€์žˆ๋‹ค๋ฉด ๊ทธ ์Šค์œ„์น˜๊ฐ€ root๋ธŒ๋ฆฟ์ง€์ด๋‹ค. - ์ˆ˜์น˜๊ฐ€ ๋‚ฎ์€ ๊ฒŒ ์šฐ์„ ์ˆœ์œ„๊ฐ€ ๋†’์Œ. - .. 2021. 8. 4.
[CISCO1]_#14_[Serial ip ๋ถ€์—ฌ, ๋ผ์šฐํŒ…, ์ •์  ๋ผ์šฐํŒ…, ๋™์  ๋ผ์šฐํŒ…, show ip route, ip route] ์œ„์™€ ๊ฐ™์€ ๊ฒฝ์šฐ, ๋„คํŠธ์›Œํฌ์˜ ๊ฐœ์ˆ˜๋Š” ๋ช‡์ผ๊นŒ? 5๊ฐœ ์ด๋‹ค. ์™œ๋ƒํ•˜๋ฉด, vlan ์œผ๋กœ ๋‚˜๋ˆˆ ๊ทธ๋ฃน๋„ ํ•˜๋‚˜์˜ ๋„คํŠธ์›Œํฌ๋กœ ๊ตฌ๋ถ„ํ•˜๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค. ใ…กใ…กใ…กใ…กใ…ก Router(config)#interface serial 0/0/0 Router(config-if)# Router(config-if)#no shutdown Router(config-if)# Router(config-if)#ip address 1.1.12.1 255.255.255.252 ใ…กใ…กใ…กใ…กใ…ก Router(config)#interface serial 0/0/0 Router(config-if)# Router(config-if)#no shutdown Router(config-if)# Router(config-if)#ip address 1.1.12.2 255.255... 2021. 8. 3.
[CISCO1]_#13_[inter vlan, ์Šค์œ„์น˜ ์šด์˜ ๋ชจ๋“œ, Server mode, Client mode, Transparent mode, VTP ์ •๋ณด ๊ตํ™˜ ์กฐ๊ฑด] no sw mo acc // ์‚ญ์ œ no sw acc vl 100 // ์‚ญ์ œ ใ…กใ…กใ…กใ…กใ…ก do sh history // ์ณค๋˜ ๋ช…๋ น์–ด ๋ณด๊ธฐ. ใ…กใ…กใ…กใ…กใ…ก - ๋‹ค๋ฅธ vlan๋ผ๋ฆฌ๋„ ํ†ต์‹ ๊ฐ€๋Šฅํ•˜๋„๋ก Router์—์„œ ์„ค์ •ํ•ด์ฃผ๋Š” ๊ฒƒ. Router(config)#interface fastEthernet 0/0 Router(config-if)#no shutdown Router(config-if)#ip address 192.168.10.1 255.255.255.0 // Router์˜ ๋ฌผ๋ฆฌ์  ๊ฒŒ์ดํŠธ์›จ์ด ์„ค์ •. Router(config-if)#int fa0/0.100 // vlan100 ์„ค์ •๋ชจ๋“œ๋กœ ์ ‘์†. Router(config-subif)# %LINK-5-CHANGED: Interface FastEthernet0/0.100, c.. 2021. 7. 31.
[CISCO1]_#12_[์ถฉ๋Œ ๋„๋ฉ”์ธ, ๋ธŒ๋กœ๋“œ์บ์ŠคํŠธ ๋„๋ฉ”์ธ, VLAN ์„ค์ •/๊ตฌ์ถ•, sh vlan, switchport mode access, switchport access vlan, sw mo trunk, fa0/0.100, fa0/0.200, encapsulation dot1Q] **์ค‘์š”** ์ถฉ๋Œ ๋„๋ฉ”์ธ ๊ฐœ์ˆ˜ ๋ธŒ๋กœ๋“œ์บ์ŠคํŠธ ๋„๋ฉ”์ธ ๊ฐœ์ˆ˜ 3๊ณ„์ธต ํฌํŠธ ์ˆ˜ ํฌํŠธ์ˆ˜ 2๊ณ„์ธต ํฌํŠธ ์ˆ˜ 1 1๊ณ„์ธต 1 1 - vlan ์— ์†Œ์†๋˜์–ด ์žˆ๋˜ fa0/x ๋“ค์„ ๋‹ค๋ฅธ ๋ฐฉ๋“ค์„ ๋งŒ๋“ค์–ด์„œ ๊ทธ๋ฃน์ง€์–ด ์ฃผ๋Š” ๊ฒƒ. - Switch ๋ฅผ ํ†ตํ•ด vlan์„ ์„ค์ •ํ•œ๋‹ค. - VLAN : 4096 ๊ฐœ (์ตœ๋Œ€) - ๊ธฐ๋ณธ VLAN : 1~1001 (1001๊ฐœ). -> 1002๋ฒˆ๋ถ€ํ„ฐ๋Š” ์˜ˆ์•ฝ๋˜์–ด ์žˆ์Œ. ๊ณผ์ • : 01. VLAN ์ƒ์„ฑ. 02. VLAN์— ํฌํŠธ ์ˆ˜์šฉ/ํฌํ•จ. SW(config)#vlan 100 // vlan์— 100์ด๋ผ๋Š” ์œ„์น˜์— ๊ทธ๋ฃน ์ƒ์„ฑ. SW(config-vlan)# ๊ฐ™์€ ๋ฐฉ์‹์œผ๋กœ vlan200์— ๊ทธ๋ฃน์„ ํ•˜๋‚˜ ๋” ๋งŒ๋“ค๊ฒ ๋‹ค. SW(config-vlan)#vlan 200 // vlan ๋ฒˆํ˜ธ 200์— ๊ทธ๋ฃน ์ƒ์„ฑ. ใ…กใ…กใ…กใ…กใ…ก SW.. 2021. 7. 30.
[CISCO1]_#11_[reload, ํŒจ์Šค์›Œ๋“œ ์„ค์ •, Console ํŒจ์Šค์›Œ๋“œ ์„ค์ •, ํŒจ์Šค์›Œ๋“œ ์•”ํ˜ธํ™” ์„ค์ •, mac-address-table, ์Šค์œ„์น˜์˜ 5๋Œ€ ๊ธฐ๋Šฅ, ์ถฉ๋Œ ๋„๋ฉ”์ธ, ๋ธŒ๋กœ๋“œ์บ์ŠคํŠธ ๋„๋ฉ”์ธ ] ** Ctrl + Shift + 6 -> ๊ฐ•์ œ์ข…๋ฃŒ. ใ…กใ…กใ…กใ…กใ…ก #reload -> ๊ป๋‹ค ํ‚ค๊ธฐ. => yes/no => yes : writeํ•œ ํ›„ ์žฌ์‹œ๋™ / no : write ํ•˜์ง€ ์•Š๊ณ  ์žฌ์‹œ๋™. ใ…กใ…กใ…กใ…กใ…ก - (์ผ๋ฐ˜ ์‚ฌ์šฉ์ž์—์„œ ๊ด€๋ฆฌ์ž๋กœ ์ ‘์† ์‹œ) (1) ํ‰๋ฌธ ํŒจ์Šค์›Œ๋“œ (conf)# enable password 1234 (2) ์•”ํ˜ธ ํŒจ์Šค์›Œ๋“œ (conf)# enable secret 123456 // ํ‰๋ฌธ ํŒจ์Šค์›Œ๋“œ์™€ ๊ฐ™๊ฒŒ ์„ค์ • ๋ถˆ๊ฐ€๋Šฅ. **์ผ๋ฐ˜ ์‚ฌ์šฉ์ž ๋ชจ๋“œ์—์„œ >enable ๋กœ ์ ‘์†ํ•˜๋ คํ• ๋•Œ ์•”ํ˜ธํ™” ํŒจ์Šค์›Œ๋“œ๋ฅผ ๋จผ์ € ์ณ๋„ ๋“ค์–ด๊ฐ€์ง„๋‹ค.** **์„ค์ •ํ•œ ์•”ํ˜ธ๋Š” running config์—์„œ ํ™•์ธ ๊ฐ€๋Šฅ. ** ์‚ญ์ œ : (conf)# no enable passoword ์‚ญ์ œ : (conf)# no enable secret.. 2021. 7. 29.
[CISCO1]_#10_[Switch ์žฅ๋น„์—ฐ๊ฒฐ, ํฌํŠธ ์‹œ๋ฆฌ์–ผ, Serial DCE, ์ผ๋ฐ˜ ์‚ฌ์šฉ์ž ๋ชจ๋“œ, ๊ด€๋ฆฌ์ž ๋ชจ๋“œ, ์ „์—ญ ์„ค์ • ๋ชจ๋“œ, ์ธํ„ฐํŽ˜์ด์Šค ๋ชจ๋“œ, enable, configure terminal, interface fastethernet0/1, show running-config, show startup-config] ์œ„ ๊ทธ๋ฆผ์˜ ๋นจ๊ฐ•์ƒ‰์œผ๋กœ ํ‘œ์‹œํ•œ ๋ถ€๋ถ„์„ ํ™•๋Œ€ํ•ด ๋ณด๊ฒ ๋‹ค. -> ใ…กใ…กใ…กใ…กใ…ก **์žฅ๋น„๋ฅผ ์—ฐ๊ฒฐํ•˜๊ฑฐ๋‚˜ ์ œ๊ฑฐํ•  ๋•Œ๋Š” ๊ผญ ์ „์›์„ ๋ˆ ์ƒํƒœ์—์„œ ํ•ด์•ผํ•œ๋‹ค.** ๊ทธ๋Ÿผ ์˜ค๋ฅธ์ชฝ์˜ Router๋„ ์žฅ๋น„๋ฅผ ์—ฐ๊ฒฐํ•˜์—ฌ ์‹œ๋ฆฌ์–ผ์„ ๋งŒ๋“ค๊ณ  ์–‘์˜†์„ ์—ฐ๊ฒฐํ•œ๋‹ค. ์ด๋•Œ, ๋‘ Router๋Š” Serial DCE๋ผ๋Š” ์„ ์œผ๋กœ ์—ฐ๊ฒฐํ•œ๋‹ค. #01. ์ผ๋ฐ˜ ์‚ฌ์šฉ์ž ๋ชจ๋“œ Switch> #02. ๊ด€๋ฆฌ์ž ๋ชจ๋“œ Switch> enable Switch# // '#'์œผ๋กœ ๋ฐ”๋€Œ๋ฉด ๊ด€๋ฆฌ์ž ๋ชจ๋“œ. #03. ์ „์—ญ ์„ค์ • ๋ชจ๋“œ Switch# configure terminal Switch(config)# // '(config)#'์œผ๋กœ ๋ฐ”๋€Œ๋ฉด ์ „์—ญ ์„ค์ • ๋ชจ๋“œ. **'?'์„ ์ž…๋ ฅํ•˜๋ฉด ๊ฐ€๋Šฅํ•œ ๋ช…๋ น์–ด๋ฅผ ๋ณด์—ฌ์ฃผ๊ณ , 'tab'์„ ๋ˆ„๋ฅด๋ฉด ์ž๋™ ์™„์„ฑ ์‹œํ‚จ๋‹ค.** #04. ์ธํ„ฐํŽ˜์ด์Šค ๋ชจ๋“œ Switch(.. 2021. 7. 29.
[CISCO1]_#09_[Packet tracer, straight, cross over, Router, Switch, Laptop, PC, IP๋ถ€์—ฌ, ping] ์— ์ฝ˜์†”๋กœ ์„ ์—ฐ๊ฒฐํ•ด์ฃผ๊ณ , ์— ๊ณผ ์„ FastEthernet์œผ๋กœ ์—ฐ๊ฒฐํ•ด์ค€ ๋ชจ์Šต์ด๋‹ค. ์ด ๊ทธ๋ฆผ์€ Router์™€ Switch๋„ ์—ฐ๊ฒฐํ•œ ์ƒํƒœ์ธ๋ฐ, ์ž์„ธํžˆ ๋ณด๋ฉด Router์™€ Switch ์‚ฌ์ด๋Š” ์—ฐ๊ฒฐ์ด ๋˜์ง€ ์•Š๊ณ  ์žˆ๊ณ (๋นจ๊ฐ•์ƒ‰), Switch์™€ PC์‚ฌ์ด๋Š” ์—ฐ๊ฒฐ์ด ์ž˜ ๋˜๊ณ  ์žˆ๋‹ค(๋…น์ƒ‰). ์œ„ ๊ทธ๋ฆผ์—์„œ๋Š” Router์™€ Router ๊นŒ์ง€๋„ ์—ฐ๊ฒฐํ•ด์ฃผ๊ณ  ์žˆ๋‹ค. ์ด๋•Œ, Router์™€ Router ์‚ฌ์ด๋Š” ์ง์„ ์ด ์•„๋‹ˆ๋ผ ์ ์„ ์ธ๋ฐ, ์ด ์„ ์€ cross over ์„ ์ด๋ผ๊ณ  ๋ถ€๋ฅธ๋‹ค. PC์™€ Switch์‚ฌ์ด์˜ ์ง์„ ๊ณผ ๊ฐ™์€ ์„ ์€ straight์„ ์ด๋ผ๊ณ  ๋ถ€๋ฅธ๋‹ค. cross-over ์‚ฌ์šฉ ๊ฒฝ์šฐ : ํ˜ธ์ŠคํŠธ๊ฐ€ ๊ฐ™์€ ๊ฒฝ์šฐ straight ์‚ฌ์šฉ ๊ฒฝ์šฐ : ํ˜ธ์ŠคํŠธ๊ฐ€ ๋‹ค๋ฅธ ๊ฒฝ์šฐ 1๊ณ„์ธต ์žฅ๋น„๋Š” ์—ฐ๊ฒฐํ•˜๋ฉด ๋ฐ”๋กœ ์‚ด์•„๋‚œ๋‹ค(์—ฐ๊ฒฐ๋œ๋‹ค). 2๊ณ„์ธต ์žฅ๋น„๋Š” ์—ฐ๊ฒฐํ•˜๋ฉด ์ƒ๊ฐ.. 2021. 7. 27.
[CISCO1]_#08_[Subnet mask, default Subnet mask, ๋ฃจํ”„๋ฐฑ ์ฃผ์†Œ, private ip address, scope, ๊ฐ€์šฉ์ฃผ์†Œ, ๋„คํŠธ์›Œํฌ์ฃผ์†Œ, ๋ผ์šฐํ„ฐ์ฃผ์†Œ, ๋ธŒ๋กœ๋“œ์บ์ŠคํŠธ์ฃผ์†Œ] - IP ์ฃผ์†Œ : Network ID(๊ณ ์ •๋œ bit) + Host ID(๊ณ ์ •๋˜์ง€ ์•Š์€ bit) - ์ด ๋„คํŠธ์›Œํฌ ๋ฒ”์œ„์—์„œ Network field์— '1'(ํ™œ์„ฑํ™”)์„ ํ• ๋‹นํ•˜๊ณ  Host field์— '0'(๋น„ํ™œ์„ฑํ™”)์„ ํ• ๋‹นํ•œ ๊ฐ’์ด Subnet mask. - IP ์ฃผ์†Œ(2์ง„์ˆ˜ ํ˜•ํƒœ)์™€ Subnet mask(2์ง„์ˆ˜ ํ˜•ํƒœ)๋ฅผ AND์—ฐ์‚ฐ ํ•˜๋ฉด Network ID ๊ฐ’์„ ์ˆ˜ํ•  ์ˆ˜ ์žˆ๋‹ค. (๋ผ์šฐํ„ฐ๊ฐ€ AND์—ฐ์‚ฐ์„ ํ•จ.) -> ๋„คํŠธ์›Œํฌ๋ฅผ ํ• ๋‹น๋ฐ›์œผ๋ฉด Host ๋ถ€๋ถ„์€ ์‚ฌ์šฉ์ž ๋งˆ์Œ๋Œ€๋กœ ์‚ฌ์šฉ๊ฐ€๋Šฅ.(๋‹จ, ์ค‘๋ณต๋˜์–ด์„  ์•ˆ๋จ.) : IP ์ฃผ์†Œ ๋ฒ”์œ„์— ๋”ฐ๋ผ Subnet mask๋ฅผ default ๊ฐ’์œผ๋กœ ์ •ํ•œ ๊ฒƒ. ** private IP ์ฃผ์†Œ ** A : 10.0.0.0.. 2021. 7. 24.
[CISCO1]_#07_[OSI 7 Layer, PDU, FCS, IP addressing๊ณ„์‚ฐ, ์„œ๋ธŒ๋„ท๋งˆ์Šคํฌ, AND์—ฐ์‚ฐ] - Route : ๊ฒฝ๋กœ - Router : ๊ฒฝ๋กœ ์„ค์ •๊ธฐ - Routing : ๊ฒฝ๋กœ ์„ค์ • - Routed ๋Š” ๋ฌด์—‡์ผ๊นŒ? => Routing protocol์—๋Š” D/V์™€ L/S๊ฐ€ ์žˆ๋Š”๋ฐ, ์ด 2๊ฐœ์˜ protocol์„ ์ œ์™ธํ•œ ๋ชจ๋“  protocol์„ Routed protocol ์ด๋ผ๊ณ  ๋ถ€๋ฅธ๋‹ค. - 7๊ณ„์ธต : Application Layer (์‘์šฉ ๊ณ„์ธต) - ์‚ฌ์šฉ์ž ์ธํ„ฐํŽ˜์ด์Šค ์—ญํ• ์„ ๋‹ด๋‹นํ•˜๋Š” ๊ณ„์ธต - ์ฆ‰, ์‚ฌ์šฉ์ž๋“ค์ด ์ด์šฉํ•˜๋Š” ๋„คํŠธ์›Œํฌ ์‘์šฉ ํ”„๋กœ๊ทธ๋žจ์ด๋ผ๊ณ  ์ƒ๊ฐํ•˜๋ฉด ๋œ๋‹ค. (ex. chrome) - ์‚ฌ์šฉ์ž์™€ ๊ฐ€์žฅ ๊ฐ€๊นŒ์šด ํ”„๋กœํ† ์ฝœ ์ •์˜ => HTTP(80), FTP(20, 21), Telnet(23), ... - 6๊ณ„์ธต : Presentation Layer(ํ‘œํ˜„ ๊ณ„์ธต) - ์ „์†กํ•˜๋Š” ๋ฐ์ดํ„ฐ์˜ Format์„ ๊ฒฐ์ •. - ๋‹ค.. 2021. 7. 24.
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