What s the Internet nuts and bolts view

What’s the Internet: “nuts and bolts” view

A closer look at network structure:

The network edge:

Access networks and physical media

The Network Core

Internet structure: network of networks

Tier-1 ISP: e. g. , Sprint

Internet structure: network of networks

Internet structure: network of networks

Internet structure: network of networks

Internet map (1999)

Network Layer Functions

The Internet Network layer

Intra-AS and Inter-AS routing

Interplay between routing and forwarding

Datagram Routing (The internet model)

Internet Protocol (IP)

IP Header

Checksum

IP Fragmentation &amp; Reassembly

IP Fragmentation and Reassembly

IP Addressing: introduction

IP addressing: CIDR 11001000 00010111 00010000

Hierarchical addressing: route aggregation

Address Resolution Protocol (ARP)

ARP operation

ARP packet format

Encapsulation of ARP packet

ARP Operation

Four different cases using ARP

ARP: Example

ICMP

Error-reporting messages

Redirection concept

Query messages

ICMP Query usage (Ping)

Traceroute and ICMP

“Real” Internet delays and routes

IPv 6 address

IPv 6 address

IPv 6 datagram

IPv 6 Header

Three transition strategies from IPv 4 to IPv 6

Transition From IPv 4 To IPv 6

Tunneling

Dual stack

Header translation

NAT: Network Address Translation

NAT: Network Address Translation

NAT: Network Address Translation

NAT: Network Address Translation

NAT: Network Address Translation

NAT: Network Address Translation