Author:
Network Layer⚓︎
Definition⚓︎
Demand?
Data need to be transferred from one location to another.
Why don't we use Data Link Layer
?
If we need the data to be transferred from the western coast LAN
to the eastern coast LAN
across the US, we have the below plans:
- Plan A: LAN is limited locally. So we should use other long-distance links such as using
PPP
/MPLS
/ATM
. Obviously, building specificp2p
networking is costly and messy. - Plan B: The
protocols
used in theLayer2 network
are not always the same. Compatibility is a problem.
How?
To solve this problem, we need to import a new layer. Layer3
-- Network Layer
is where Internetworking
comes from.
We need to use IP protocol
and IP packets
.
IP packets⚓︎
IP packets
?
IP packets
is the data unit used within the Internet Protocol. It is similar to frame
in the Layer 2
.
Datagram
is an alternative term for "packet".
Structure
There are two types of IP packets for IPv4
(Internet Protocol version 4) and IPv6
(Internet Protocol version 6):
References⚓︎
Networking Fundamentals: OSI 7 - Layer 3 - the network layer - Part 1
Last update:
February 27, 2023 00:42:01
Created: December 11, 2022 01:42:37
Created: December 11, 2022 01:42:37