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想問router會唔會操作layer 2 既野？

家用router?

將network a同network b駁埋既router

功課⋯⋯⋯咁樣就唔會處理

唔係功課

睇緊片學野

呢類野係教你個原理，所以唔會。真實情況要睇你用緊邊隻Model既設備，對上條友點Set

唔好at我住，我準備訓了，聽日先再入黎睇，早抖

Ok

Hi

考 a level

點為止操作layer 2，router梗係要有layer 2 info先做到forwarding

你兩隻router互對，就算冇set IP都會有layer 2 traffic

有好多protocol都係layer 2

你隻Router每一個port都有一個mac address

PCA send野去 PCB

Source :1234 des: 3389

最基本router都要ARP

咁就梗係會用到Layer 2

Source: 3389 des: 6689

個router識得改個mac address, 我就係覺得會操作layer 2

Router會改左你封包既mac destination

咁就會

咁router算係layer 2 + layer 3 device?

已經換左MAC

你可以自己開個packet tracer試下

我知會換呀

PCA知道PCB要經過Router，所以PCA個DST MAC係Router Mac

Router收到之後發現唔係自己既IP，就會對routing table

然後改src mac dst mac再係相應端口出

咁個router都算layer 2 device啦？

咁router唔係layer 3 device, 而係layer 2+ 3 device啦

Layer 3 suppose to include layer 1 and 2 too

Since you could not operate solely on layer 3

Layer 3 is dependent on Layer 1/2

咁我明啦

Router layer 3改寫完咪要係要靠layer 2去射返出去

要睇Layer 2先知個packet應該射去邊個接口