๐Ÿงช CCNA ์‹ค์Šต

[CCNA ์‹ค์Šต - ITN 6&7-1] ์ด๋”๋„ท ํ”„๋ ˆ์ž„ ํ•„๋“œ ํ™•์ธ ์‹ค์Šต | MAC ์ฃผ์†Œ, EtherType, FCS ๋ถ„์„

Network History๐ŸŒ Last Updated: 2026. 6. 22. 15:26

๐Ÿงช CCNA ์‹ค์Šต / ITN 6&7-1

์ด๋”๋„ท ํ”„๋ ˆ์ž„ ํ•„๋“œ ํ™•์ธ ์‹ค์Šต

์ด๋ฒˆ ์‹ค์Šต์—์„œ๋Š” PC1์—์„œ PC2๋กœ ping์„ ๋ณด๋‚ด๊ณ , Packet Tracer Simulation Mode์—์„œ ์ด๋”๋„ท ํ”„๋ ˆ์ž„ ํ•„๋“œ๋ฅผ ํ™•์ธํ•ฉ๋‹ˆ๋‹ค.

๐Ÿ’ก ์ด ์‹ค์Šต์˜ ๋ชฉํ‘œ๋Š” ping ์„ฑ๊ณต์ด ์•„๋‹ˆ๋ผ, ํ”„๋ ˆ์ž„ ์•ˆ์— ์–ด๋–ค ์ •๋ณด๊ฐ€ ๋“ค์–ด๊ฐ€๋Š”์ง€๋ฅผ ๋ณด๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค.

Destination MAC, Source MAC, Type, FCS๋ฅผ ํ•™์Šต๊ธ€์˜ ์ด๋”๋„ท ํ”„๋ ˆ์ž„ ๊ตฌ์กฐ์™€ ์—ฐ๊ฒฐํ•ด์„œ ํ™•์ธํ•˜์„ธ์š”.

๐Ÿ“˜ ์‹ค์Šต ์‹œ๋‚˜๋ฆฌ์˜ค

PC1๊ณผ PC2๊ฐ€ ๊ฐ™์€ ์Šค์œ„์น˜ S1์— ์—ฐ๊ฒฐ๋œ ์ž‘์€ LAN์ž…๋‹ˆ๋‹ค. PC1์ด PC2๋กœ ping์„ ๋ณด๋‚ด๋ฉด, ์‹ค์ œ LAN ๊ตฌ๊ฐ„์—์„œ๋Š” ์ด๋”๋„ท ํ”„๋ ˆ์ž„์ด ์ƒ์„ฑ๋˜์–ด ์ „๋‹ฌ๋ฉ๋‹ˆ๋‹ค.

๐ŸŽฏ ์ฃผ์†Œ ๊ณ„ํš

์žฅ๋น„ IP ์ฃผ์†Œ ์„œ๋ธŒ๋„ท ๋งˆ์Šคํฌ ์—ญํ• 
PC1 192.168.60.10 255.255.255.0 ์ถœ๋ฐœ์ง€ ํ˜ธ์ŠคํŠธ
PC2 192.168.60.20 255.255.255.0 ๋ชฉ์ ์ง€ ํ˜ธ์ŠคํŠธ
S1 - - ์ด๋”๋„ท ํ”„๋ ˆ์ž„ ์ „๋‹ฌ

๐Ÿงญ ์‹ค์Šต ํ๋ฆ„

1
IP ์„ค์ •
PC1๊ณผ PC2๋ฅผ ๊ฐ™์€ ๋„คํŠธ์›Œํฌ์— ์„ค์ •ํ•ฉ๋‹ˆ๋‹ค.
2
ping ์ „์†ก
PC1์—์„œ PC2๋กœ ping์„ ๋ณด๋ƒ…๋‹ˆ๋‹ค.
3
PDU ํ™•์ธ
Simulation Mode์—์„œ Ethernet II ํ”„๋ ˆ์ž„ ์ •๋ณด๋ฅผ ํ™•์ธํ•ฉ๋‹ˆ๋‹ค.
4
ํ•„๋“œ ๋ถ„์„
Destination MAC, Source MAC, Type, FCS ์—ญํ• ์„ ์ •๋ฆฌํ•ฉ๋‹ˆ๋‹ค.

๐Ÿ’ป ์‹ค์Šต ์œ„์ ฏ

๐Ÿงพ ๋ช…๋ น์–ด ์ „์ฒด ์ •๋‹ต

PC1

ip 192.168.60.10 255.255.255.0
show ip
ping 192.168.60.20

PC2

ip 192.168.60.20 255.255.255.0
show ip

๐Ÿ” PDU Details์—์„œ ๋ณผ ํ•ญ๋ชฉ

ํ™•์ธ ํ•ญ๋ชฉ ์˜๋ฏธ ์ฒดํฌ ํฌ์ธํŠธ
Destination MAC ํ”„๋ ˆ์ž„์„ ๋ฐ›์„ ์žฅ์น˜์˜ MAC ์ฃผ์†Œ ๊ฐ™์€ LAN์ด๋ฉด PC2 MAC
Source MAC ํ”„๋ ˆ์ž„์„ ๋ณด๋‚ธ ์žฅ์น˜์˜ MAC ์ฃผ์†Œ PC1 MAC
Type / EtherType ํ”„๋ ˆ์ž„ ์•ˆ์˜ ์ƒ์œ„ ๊ณ„์ธต ํ”„๋กœํ† ์ฝœ ์‹๋ณ„ IPv4, IPv6 ๋“ฑ
Data ์บก์Аํ™”๋œ ์ƒ์œ„ ๊ณ„์ธต ๋ฐ์ดํ„ฐ ping ๊ด€๋ จ ์ •๋ณด ํฌํ•จ
FCS ํ”„๋ ˆ์ž„ ์˜ค๋ฅ˜ ๊ฐ์ง€ ์†์ƒ ์—ฌ๋ถ€ ํ™•์ธ์šฉ

๐Ÿ”Ž ์‹คํŒจํ–ˆ์„ ๋•Œ ์ ๊ฒ€ ์ˆœ์„œ

์ฆ์ƒ ํ™•์ธํ•  ๊ฒƒ ํ•ด๊ฒฐ ๋ฐฉํ–ฅ
ping ์‹คํŒจ IP ์ฃผ์†Œ, ์„œ๋ธŒ๋„ท ๋งˆ์Šคํฌ, ์ผ€์ด๋ธ” ์—ฐ๊ฒฐ ์ฃผ์†Œ ๊ณ„ํš๊ณผ ๋งํฌ ์ƒํƒœ ํ™•์ธ
PDU๊ฐ€ ์•ˆ ๋ณด์ž„ Simulation Mode ํ•„ํ„ฐ ICMP, ARP, Ethernet ๊ด€๋ จ ํ•ญ๋ชฉ ํ‘œ์‹œ
MAC ์ฃผ์†Œ๊ฐ€ ํ—ท๊ฐˆ๋ฆผ ์ถœ๋ฐœ์ง€/๋ชฉ์ ์ง€ ๋ฐฉํ–ฅ ํ”„๋ ˆ์ž„์ด ์ด๋™ํ•˜๋Š” ๋ฐฉํ–ฅ ๊ธฐ์ค€์œผ๋กœ ํ™•์ธ
ํ”„๋ ˆ์ž„ ํ•„๋“œ๊ฐ€ ์•ˆ ๋ณด์ž„ PDU Details Outbound/Inbound PDU Details ํ™•์ธ

์‹ค์Šต ํ•ต์‹ฌ: ๊ฐ™์€ LAN์—์„œ ํ†ต์‹ ํ•  ๋•Œ IP ํŒจํ‚ท์€ ์ด๋”๋„ท ํ”„๋ ˆ์ž„ ์•ˆ์— ์บก์Аํ™”๋˜๊ณ , ํ”„๋ ˆ์ž„ ํ—ค๋”์—๋Š” ์ถœ๋ฐœ์ง€์™€ ๋ชฉ์ ์ง€ MAC ์ฃผ์†Œ๊ฐ€ ๋“ค์–ด๊ฐ‘๋‹ˆ๋‹ค.