Network Layer

Send a segment from sending to receiving host

on sending side encapsulates segments into datagrams

on receiving side, delivers segments to transport layer

network layer protocols is in every host, router

router checks header fields in all IP datagrams passing through it

https://scrapbox.io/files/654c919ad2628b001c9a0b2c.png

https://scrapbox.io/files/654f6b9267e4e0001bf5f38f.png