4: Network Layer4a-1 IP addresses: how to get one? Hosts (host portion): r hard-coded by system admin in a file r DHCP: Dynamic Host Configuration Protocol:

Slides:

Advertisements

Similar presentations

CPSC Network Layer4-1 IP addresses: how to get one? Q: How does a host get IP address? r hard-coded by system admin in a file m Windows: control-panel->network->configuration-

Advertisements

4 IP Address (IPv4)  A unique 32-bit number  Identifies an interface (on a host, on a router, …)  Represented in dotted-quad notation

4: Network Layer4a-1 IP Addressing: introduction r IP address: 32-bit identifier for host, router interface r interface: connection between host, router.

8-1 Last time □ Network layer ♦ Introduction forwarding vs. routing ♦ Virtual circuit vs. datagram details connection setup, teardown VC# switching forwarding.

Introduction 1-1 1DT066 Distributed Information System Chapter 4 Network Layer.

Announcement r Recitation tomorrow on Project 2 r Midterm Survey at the end of this class.

Week 5: Internet Protocol Continue to discuss Ethernet and ARP –MTU –Ethernet and ARP packet format IP: Internet Protocol –Datagram format –IPv4 addressing.

Network Layer introduction 4.2 virtual circuit and datagram networks 4.3 what’s inside a router 4.4 IP: Internet Protocol  datagram format  IPv4.

Network Layer4-1 Computer Networking (Datakom) Chapter 4: Network Layer Chapter goals: r understand principles behind network layer services: m routing.

Announcement r Project 2 due Fri. midnight r Homework 3 out m Due 2/29 Sun. r Advertisement for my CS395/495 course next quarter: Computer Network Security:

N/W Layer Addressing1 Instructor: Anirban Mahanti Office: ICT Class Location: ICT 121 Lectures: MWF 12:00 – 12:50 Notes.

Rensselaer Polytechnic Institute © Shivkumar Kalvanaraman & © Biplab Sikdar 1 ECSE-4670: Computer Communication Networks (CCN) Network Layer Shivkumar.

11- IP Network Layer4-1. Network Layer4-2 The Internet Network layer forwarding table Host, router network layer functions: Routing protocols path selection.

CMPE 80N - Introduction to Networks and the Internet 1 CMPE 80N Winter 2004 Lecture 18 Introduction to Networks and the Internet.

Network Layer4-1 IP: Internet Protocol r Datagram format r IPv4 addressing r DHCP: Dynamic Host Configuration Protocol r NAT: Network Address Translation.

IP Addressing: introduction

1 Lecture 11: The Network Layer Slides adapted from: Congestion slides for Computer Networks: A Systems Approach (Peterson and Davis) Chapter 3 slides.

CSE452:Computer Networks

4: Network Layer4a-1 Chapter 4: Network Layer Chapter goals: r understand principles behind network layer services: m routing (path selection) m dealing.

Announcement r Project 2 Extension ? m Previous grade allocation: Projects 40% –Web client/server7% –TCP stack21% –IP routing12% Midterm 20% Final 20%

Network Layer session 1 TELE3118: Network Technologies Week 4: Network Layer Basics, Addressing Some slides have been taken from: r Computer Networking:

Network Layer4-1 Network layer r transport segment from sending to receiving host r on sending side encapsulates segments into datagrams r on rcving side,

IP Address 0 network host 10 network host 110 networkhost 1110 multicast address A B C D class to to

Network Layer4-1 Network layer r transport segment from sending to receiving host r on sending side encapsulates segments into datagrams r on rcving side,

Lecture 7 – IP Addressing and Forwarding

RSC Part II: Network Layer 3. IP addressing Redes y Servicios de Comunicaciones Universidad Carlos III de Madrid These slides are, mainly, part of the.

DHCP: Dynamic Host Configuration Protocol

CT 320: Network and System Administration Fall 2014 * Dr. Indrajit Ray Department of Computer.

Chapter 4 Network Layer Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 A note on the use of these.

Network LayerII-1 RSC Part II: Network Layer 3. IP addressing (2nd part) Redes y Servicios de Comunicaciones Universidad Carlos III de Madrid These slides.

Datagram Networks: Internet Protocol (IPv4)

CS 1652 The slides are adapted from the publisher’s material All material copyright J.F Kurose and K.W. Ross, All Rights Reserved Jack Lange.

12 – IP, NAT, ICMP, IPv6 Network Layer.

Chapter 4 Network Layer slides are modified from J. Kurose & K. Ross CPE 400 / 600 Computer Communication Networks Lecture 16.

Network Layer4-1 DHCP: Dynamic Host Configuration Protocol Goal: allow host to dynamically obtain its IP address from network server when it joins network.

1DT066 Distributed Information System Chapter 4 Network Layer.

Transport Layer 3-1 Chapter 4 Network Layer Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012  CPSC.

CIS 3360: Internet: Network Layer Introduction Cliff Zou Spring 2012.

Network Layer4-1 Subnets How many?

1 Chapter 4: Network Layer r 4.4 IP: Internet Protocol m Datagram format m IPv4 addressing m ICMP m IPv6 r 4.5 Routing algorithms m Hierarchical routing.

RSC Part II: Network Layer 3. IP addressing Redes y Servicios de Comunicaciones Universidad Carlos III de Madrid These slides are, mainly, part of the.

Chapter 4, slide: 1 CS 372 – introduction to computer networks* Friday July 23, 2010 Announcements: r Midterms are graded. r Lab 4 is posted. Acknowledgement:

1 Addressing. 2 Outline  Network addressing  Network packet format and forwarding  NAT, DHCP, IPv6.

Network Layer4-1 The Internet Network layer forwarding table Host, router network layer functions: Routing protocols path selection RIP, OSPF, BGP IP protocol.

1 Network Layer Lecture 15 Imran Ahmed University of Management & Technology.

Network Layer4-1 Chapter 4 roadmap 4.1 Introduction and Network Service Models 4.2 Routing Principles 4.3 Hierarchical Routing 4.4 The Internet (IP) Protocol.

Network Layer4-1 The Internet Network layer forwarding table Host, router network layer functions: Routing protocols path selection RIP, OSPF, BGP IP protocol.

Sharif University of Technology, Kish Island Campus Internet Protocol (IP) by Behzad Akbari.

Transport Layer3-1 Chapter 4: Network Layer r 4. 1 Introduction r 4.2 Virtual circuit and datagram networks r 4.3 What’s inside a router r 4.4 IP: Internet.

Network Layer4-1 Chapter 4: Network Layer Chapter goals: r Understand principles behind network layer services: m Routing (path selection) m dealing with.

The Internet Network layer

Data Communications and Computer Networks Chapter 4 CS 3830 Lecture 19 Omar Meqdadi Department of Computer Science and Software Engineering University.

Network Layer4-1 Chapter 4 Network Layer All material copyright J.F Kurose and K.W. Ross, All Rights Reserved Computer Networking: A Top Down.

@Yuan Xue A special acknowledge goes to J.F Kurose and K.W. Ross Some of the slides used in this lecture are adapted from their.

1 COMP 431 Internet Services & Protocols The IP Internet Protocol Jasleen Kaur April 21, 2016.

CSE 421 Computer Networks. Network Layer 4-2 Chapter 4: Network Layer r 4. 1 Introduction r 4.2 Virtual circuit and datagram networks r 4.3 What’s inside.

4: DataLink Layer1 LAN technologies Data link layer so far: m services, error detection/correction, multiple access Next: LAN technologies m addressing.

4: Network Layer4a-1 Chapter 4: Network Layer Chapter goals: r understand principles behind network layer services: m routing (path selection) m dealing.

12 – IP, NAT, ICMP, IPv6 Network Layer.

Computer Communication Networks

Some slides have been taken from:

Chapter 4: Network Layer

Chapter 4: Network Layer

CS 1652 Jack Lange University of Pittsburgh

Wide Area Networks and Internet CT1403

Overview The Internet (IP) Protocol Datagram format IP fragmentation

ECSE-4670: Computer Communication Networks (CCN)

Chapter 5: Link Layer 5.1 Introduction and services

Presentation transcript:

4: Network Layer4a-1 IP addresses: how to get one? Hosts (host portion): r hard-coded by system admin in a file r DHCP: Dynamic Host Configuration Protocol: dynamically get address: “plug-and-play” m host broadcasts “DHCP discover” msg m DHCP server responds with “DHCP offer” msg m host requests IP address: “DHCP request” msg m DHCP server sends address: “DHCP ack” msg

4: Network Layer4a-2 IP addresses: how to get one? Network (network portion): r get allocated portion of ISP’s address space: ISP's block /20 Organization /23 Organization /23 Organization /23... ….. …. …. Organization /23

4: Network Layer4a-3 Hierarchical addressing: route aggregation “Send me anything with addresses beginning /20” / / /23 Fly-By-Night-ISP Organization 0 Organization 7 Internet Organization 1 ISPs-R-Us “Send me anything with addresses beginning /16” /23 Organization Hierarchical addressing allows efficient advertisement of routing information:

4: Network Layer4a-4 Hierarchical addressing: route aggregation “Send me anything with addresses beginning /20” / / /23 Fly-By-Night-ISP Organization 0 Organization 7 Internet Organization /23 Organization 2 Hierarchical addressing allows efficient advertisement of routing information: bits

4: Network Layer4a-5 Hierarchical addressing: more specific routes ISPs-R-Us has a more specific route to Organization 1 “Send me anything with addresses beginning /20” / / /23 Fly-By-Night-ISP Organization 0 Organization 7 Internet Organization 1 ISPs-R-Us “Send me anything with addresses beginning /16 or /23” /23 Organization

4: Network Layer4a-6 IP addressing: the last word... Q: How does an ISP get block of addresses? A: ICANN: Internet Corporation for Assigned Names and Numbers m allocates addresses m manages DNS m assigns domain names, resolves disputes

4: Network Layer4a-7 Getting a datagram from source to dest. IP datagram: A B E misc fields source IP addr dest IP addr data r datagram remains unchanged, as it travels source to destination r addr fields of interest here Dest. Net. next router Nhops routing table in A

4: Network Layer4a-8 Getting a datagram from source to dest A B E Starting at A, given IP datagram addressed to B: r look up net. address of B r find B is on same net. as A r link layer will send datagram directly to B inside link-layer frame m B and A are directly connected Dest. Net. next router Nhops misc fields data

4: Network Layer4a-9 Getting a datagram from source to dest A B E Dest. Net. next router Nhops Starting at A, dest. E: r look up network address of E r E on different network m A, E not directly attached r routing table: next hop router to E is r link layer sends datagram to router inside link- layer frame r datagram arrives at r continued….. misc fields data

4: Network Layer4a-10 Getting a datagram from source to dest A B E Arriving at , destined for r look up network address of E r E on same network as router’s interface m router, E directly attached r link layer sends datagram to inside link-layer frame via interface r datagram arrives at !!! (hooray!) misc fields data network router Nhops interface Dest. next