Any Questions?.

Slides:



Advertisements
Similar presentations
Fred P. Baker CCIE, CCIP(security), CCSA, MCSE+I, MCSE(2000)
Advertisements

By Taylor and Ed. Uses standard voice telephone lines Uses a modem to place a telephone call to another modem at a remote site Two major disadvantages.
There are many types of WAN technologies that can be used to solve the problems of users who need network access from remote locations. We will go through.
Presented by: Eng. Karam Al-sofy
Networking at Home the Office and Globe
Networking | Hardware Components
Networks & Components Discuss the components required for successful communications Explain the purpose of communications software Identify various sending.
CST Computer Networks NAT CST 415 4/10/2017 CST Computer Networks.
Networking at Home and Abroad
© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public ITE PC v4.0 Chapter 1 1 Addressing the Network – IPv4 Network Fundamentals – Chapter 6.
© 2009 Pearson Education, Inc. Publishing as Prentice Hall 6-1 Raymond Panko’s Business Data Networks and Telecommunications, 7th edition May only be used.
IST 201 Chapter 9. TCP/IP Model Application Transport Internet Network Access.
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—5-1 WAN Connections Enabling the Internet Connection.
© 2007 Cisco Systems, Inc. All rights reserved. 1 Network Addressing Networking for Home and Small Businesses – Chapter 5.
BTT 101 / 2O1 Lesson 10 Dundas Valley Secondary Mr. Young.
Telecommunications systems (Part 1) School of Business Eastern Illinois University © Abdou Illia, Spring 2007 (Week 12, Tuesday 3/27/2007)
(part 4).  Gateways  A gateway is responsible for translating information from one format to another and can run at any layer of the OSI model, depending.
Wi-Fi Structures.
Chapter 9 Using Telephone and Cable Networks for Data Transmission Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or.
X.25 Packet switched Network consisting of X.25 switches. X.25 is a connection oriented protocol (Virtual Circuits). End nodes are identified by an X.25.
Basic Network Training. Cable/DSL Modem The modem is the first link in the chain It is usually provided by the ISP and often has a coax cable connector.
© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public ITE PC v4.0 Chapter 1 1 Network Addressing Networking for Home and Small Businesses – Chapter.
CCNA Discovery 1 Chapter 5: Network Addressing
4: Addressing Working At A Small-to-Medium Business or ISP.
Networking Technologies
Introduction to Networks. Objectives The purpose and uses of networks The Key components of a computer network The Different types of network and the.
Module CT3004N: Wide Area Networks Lecture Week 1.
IT in Business Enterprise and Personal Communications Networks Lecture – 07.
© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public 1 Version 4.0 Network Addressing Networking for Home and Small Businesses – Chapter 5.
Computer Networking Part 1 CS 1 Rick Graziani Cabrillo College Fall 2005.
© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public ITE PC v4.0 Chapter 1 1 The Internet and Its Uses Working at a Small-to-Medium Business or.
© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE I Chapter 6 1 Services in a Converged WAN Accessing the WAN – Chapter 1.
Cisco 1 - Networking Basics Perrine. J Page 19/14/2015 Chapter 3 Which of the following describes a network interface card? 1.Large circuit board that.
Introduction to Network Address Translation
Modems Mostly used to connect PCs to the Internet Modulates and demodulates the signal Converts analog data into digital and vice versa V.90/V.92 56K standards.
Common Devices Used In Computer Networks
LO1 Know types of Network Systems and Protocols. Wan Technologies.
WANs and Remote Connectivity
Networks and Protocols CE Week 5b. WAN’s, Frame Relay, DSL, Cable.
© 2007 Cisco Systems, Inc. All rights reserved. 1 Network Addressing Networking for Home and Small Businesses – Chapter 5 Darren Shaver – Modified Fall.
15-1 Networking Computer network A collection of computing devices that are connected in various ways in order to communicate and share resources.
Network Addresses, Switches and Routing Bob Bradley IS361 Fall 2005 Chapter 1 Part 2.
Information Flow Across the Internet. What is the Internet? A large group of computers that link together to form the Worldwide Area Network (WAN)
© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public ITE PC v4.0 Chapter 1 1 Planning the Addressing Structure Working at a Small-to-Medium Business.
© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 1 Version 4.0 Services in a Converged WAN Accessing the WAN – Chapter 1.
Lectu re 1 Recap: “Operational” view of Internet r Internet: “network of networks” m Requires sending, receiving of messages r protocols control sending,
NT1210 Introduction to Networking
WAN TECHNOLOGY CONCEPTS 1 st semester nalhareqi©2015.
Connection Technologies and IP Addressing CONNECTING TO THE INTERNET.
COMPUTER NETWORKING 2 LECTURE 3: BROADBAND TECHNOLOGY & DSL.
Communications and Networks 2 Compiled by Maududie Reference: Practicum Module Application Training Institut Teknologi Bandung
NT1210 Introduction to Networking
Chapter 5. An IP address is simply a series of binary bits (ones and zeros). How many binary bits are used? 32.
NT1210 Introduction to Networking
Computer Engineering and Networks, College of Engineering, Majmaah University Mohammed Saleem Bhat CEN-444 Networks Structure And Protocols.
Copyright © 2006 Heathkit Company, Inc. All Rights Reserved Introduction to Networking Technologies Digital Subscriber Line (DSL)
NT1210 Introduction to Networking
Planning the Addressing Structure
Networking for Home and Small Businesses – Chapter 5
Instructor Materials Chapter 1: WAN Concepts
Chapter Objectives In this chapter, you will learn:
Chapter 1 Introduction to Networking
Introduction to Wide Area Networks
Chapter 1: WAN Concepts Connecting Networks
NT1210 Introduction to Networking
NAT / PAT.
NT1210 Introduction to Networking
Planning the Addressing Structure
Planning the Addressing Structure
GETTING CONNECTED TO INTERNET
Presentation transcript:

Any Questions?

Chapter 16-WAN Concepts WAN Technologies IP Services for Internet Access

Do I know this? Go through the Quiz- 5 minutes

1. Which of the following best describes the function of demodulation by a modem? a. Encoding an incoming analog signal from the PC as a digital signal for transmissio into the PSTN b. Decoding an incoming digital signal from the PSTN into an analog signal c. Encoding a set of binary digits as an analog electrical signal d. Decoding an incoming analog electrical signal from the PSTN into a digita signal e. Encoding a set of binary digits as a digital electrical signal

2. Which of the following standards has a limit of 18,000 feet for the length of the local loop? a. ADSL b. Analog modems c. ISDN d. Cable Internet service

3. Which of the following is true regarding the location and purpose of a DSLAM? a. Typically used at a home or small office to connect the phone line to a DSL router b. Typically used at a home or small office instead of a DSL router c. Typically used inside the telco’s CO to prevent any voice traffic from reaching the ISP’s router d. Typically used inside the telco’s CO to separate the voice traffic from the data traffic

4. Which of the following remote-access technologies support specifications that allow both symmetric speeds and asymmetric speeds? a. Analog modems b. WWW c. DSL d. Cable modems

5. Which of the following remote-access technologies, when used to connect to an ISP, is considered to be an “always on” Internet service? a. Analog modems b. DSL c. Cable modems d. All of these answers are correct.

6. For a typical Internet access router, using either cable or DSL, which of the following does the router typically do on the router interface connected to the LAN with the PCs in the small or home office? a. Acts as a DHCP server b. Acts as a DHCP client c. Performs NAT/PAT for the source address of packets that exit the interface d. Acts as DNS server

7. For a typical Internet access router, using either cable or DSL, which of the following does the router typically do on the router interface connected toward the Internet? a. Acts as a DHCP server b. Acts as a DHCP client c. Performs NAT/PAT for the source address of packets that exit the interface d. Acts as DNS server

8. This question examines a home-based network with a PC, a DSL router, and a DSL line. The DSL router uses typical default settings and functions. The PC connected to the router has IP address 10.1.1.1. This PC opens a browser and connects to the www.cisco.com web server. Which of the following are true in this case? a. The web server can tell it is communicating with a host at IP address 10.1.1.1. b. The PC learns the IP address of the www.cisco.com web server as a public IP address. c. The 10.1.1.1 address would be considered an inside local IP address. d. The 10.1.1.1 address would be considered an inside global IP address.

Any Questions?

WAN Connection DSL, Modems, Cable, ATM PSTN CO Designed for Voice-Analog Can support data now DSL, Modems CO Convert to Digital Pg 516

Modem Modulator/Demodulator Modem dials ISP router and gets an IP Convert the digital signal from computer to analog signal for local loop Modem dials ISP router and gets an IP Pg 518

DSL Just connectivity-utility service Can’t dial any number like modem DSL allows analog voice signals and digital data signals to be sent over the same local loop wiring at the same time. The local loop must be connected to something besides a traditional voice switch at the local CO, in this case a device called a DSL access multiplexer (DSLAM). DSL allows for a concurrent voice call to be up at the same time as the data connection. Unlike modems, DSL’s data component is always on; in other words, you do not have to signal or dial a phone number to set up a data circuit. Pg 519

DSL At CO DSLAM separates out DSL signal on higher frequencies The distance between the CO and the consumer (the longer the distance, the slower the speed) The quality of the local loop cabling (the worse the wiring, the slower the speed) The type of DSL (each standard has different maximum theoretical speeds) The DSLAM used in the CO (older equipment may not have recent improvements that allow for faster speeds on lower-grade local loops) Pg 519-522

Cable Internet Similar idea to DSL Higher overall speed Shared access on head-end

Summary Pg 525

Asynchronous Transfer Mode Packet Switching (like frame relay) Or Switching technology in core network ATM connection like Frame VCs 48 byte payload and 5 byte header 53 byte CELL

Packet vs. Circuit Switching Pg 527

Ethernet as WAN Metro Ethernet Limited to contract speed

Address assignment on Internet routers The Internet-facing interface needs one public IP address so that the routers in the Internet know how to route packets to the access router. The ISP typically assigns that public (and globally routable) IP address dynamically, using DHCP. The local PCs typically need to dynamically learn IP addresses with DHCP, so the access router will act as a DHCP server for the local hosts. The router needs a statically configured IP address on the local subnet, using a private network number. The local LAN subnet will use addresses in a private network number. Pg 529

Routers and DHCP Pg 530

Network Address Translation Hides the Private addresses behind the public address of the router NAT/PAT server keeps track of TCP/UDP port numbers of outgoing requests and maps them to a port on the outgoing public address

NAT

What PAT does More generally, the PAT feature causes the router to translate the source IP address and port for packets leaving the local LAN, and to translate the destination IP address and port on packets returning to the local LAN. The end result is that, as far as hosts in the Internet are concerned, all the packets coming from this one customer are from one host (64.100.1.1 in Figure 16-10), for which all the routers in the Internet should have a matching route. This allows the ISP to conserve public IPv4 addresses. Pg 534

PAT Terminology Inside host: Refers to a host in the enterprise network, like PC1 and PC2 in the last few figures. Inside local: Refers to an IP address in an IP header, with that address representing a local host as the packet passes over the local enterprise network (not the Internet). In this case, 192.168.1.101 and .102 are inside local IP addresses, and the packets at steps 1 and 4 in Figure 16-10 show inside local IP addresses. Inside global: Refers to an IP address in an IP header, with that address representing a local host as the packet passes over the global Internet (not the enterprise). In this case, 64.100.1.1 is the one inside global IP address, and the packets at steps 2 and 3 in Figure 16-10 show the inside global IP address. Inside interface: The router interface connected to the same LAN as the inside hosts. Outside interface: The router interface connected to the Internet.

Any Questions?