Chapter 4 Network Layer Chapter 4 network

Chapter 4 Network Layer

Chapter 4: network layer

Chapter 4: outline

Two key network-layer functions

Connection setup

Network service model

Network layer service models:

Chapter 4: outline

Virtual circuits

VC implementation

VC forwarding table

Longest prefix matching

Datagram or VC network: why?

Chapter 4: outline

bus

Datagram (packets) can be lost due to congestion, lack of buffers Priority scheduling – who gets best performance, network neutrality

How much buffering? RTT C N

Chapter 4: outline

host, router network layer functions: network layer

IP fragmentation, reassembly

IP fragmentation, reassembly

Chapter 4: outline

Subnets

Subnets subnet mask: /24

Subnets

IP addressing: CIDR 11001000 00010111 00010000 200. 23. 16. 0/23

classful addressing

IP addresses: how to get one?

DHCP client-server scenario

DHCP: more than IP addresses

reply request

IP addresses: how to get one?

NAT: network address translation

NAT: network address translation

NAT: network address translation

NAT: network address translation

NAT: network address translation

NAT traversal problem

NAT traversal problem

NAT traversal problem

Chapter 4: outline

Traceroute and ICMP

IPv 6: motivation

IPv 6 datagram format