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Course Syllabus

Lesson 1: A brief Overview of Cisco Certifications: 06:03 Minutes

Lesson 2: What is Networking ? 03:36

Lesson 4: Network Devices - What is a Router ? 05:10

Lesson 5: Network devices - The Router Part 2 05:57

Lesson 6: Network Devices - Wireless Access Points and Firewalls 04:47

Lesson 7: A Sample Network - Devices, Interfaces and the Network 06:23

Lesson 8: The Serial and Ethernet Network Interfaces 02:29

Lesson 9: The Network Interface Card (NIC) and Networking Cables 03:45

Lesson 10: The Media Control Access (MAC) Address 03:01

Lesson 11: Introduction to IPv4 Addresses 05:25

Lesson 12: The Address Resolution Protocol (ARP) 05:45

Lesson 13: The TCP and UDP Protocols in ARP Process 03:01

Lesson 14: Logical Network Topologies 05:53

Lesson 15: The Ethernet - An Overview 05:57

Lesson 16: The Ethernet Cabling - Part 1 02:23

Lesson 17: The Ethernet Cabling - Part 2 02:29

Lesson 18: The Twister Pair Cables 08:00

Lesson 19: Straight Through and Crossover Cables 03:59

Lesson 20: The Console Interface - Rollover cable 03:5

Lesson 21: Connecting Different Network Devices 03:27

Lesson 22: Using Fiber Optic for Ethernet Connectivity 04:09

Lesson 23: Fiber Optic IEEE Standards 05:40

Lesson 24: Fiber Optic Connection - GBIC, SFP, SFP+ 03:53

Lesson 25: Router to Router Connection - DTE vs DCE 03:33

Lesson 26: Router to Router Connection - Clock Rate and Bandwidth 02:28

Lesson 27: Modularity of Cisco Devices - Fixed and Modular Chassis 02:41

Lesson 28: Transceiver Modules 04:57

Lesson 29: The OSI Network Model 07:58

Lesson 30: The OSI Model Layers Explained 09:04

Lesson 31: Data Encapsulation and De-Encapsulation 02:22

Lesson 32: The TCP/IP Protocol Stack with its Layers Explained 07:58

Lesson 33: TCP/IP Vs OSI Model 08:53

Lesson 34: Introduction to IPv4 Addresses 04:22

Lesson 35: Classification of IPv4 Address - Class A to E 07:54

Lesson 36: Private IP Addresses 03:02

Lesson 37: Network Address Translation (NAT) 01:51

Lesson 38: The Binary Numbers Notation 07:37

Lesson 39: Part 1 -Converting Decimal to Binary Numbers 05:33

Lesson 40: Part 2 -Converting Decimal to Binary Numbers 02:37

Lesson 41: Part 3 -Converting Decimal to Binary Numbers 05:05

Lesson 42: Subnet Masks in IPv4 Addresses 05:42

Lesson 43: Introduction to IPv6 Addresses 03:27

Lesson 44: IPv6 Address Format 03:11

Lesson 45: Introduction to Cisco Devices 03:49

Lesson 46: Cisco Devices for Different Uses and Businesses 09:25

Lesson 47: The Nexus Series of Switches 03:20

Lesson 48: The Catalyst Series of Switches 03:23

Lesson 49: The Cisco Aggregation Service Router (ASR) 03:32

Lesson 50: The Cisco Integrated Service Router (ISR) 02:29

Lesson 51: Other Cisco Devices - MDS, Meraki and NCS 03:07

Lesson 52: Types of Cisco IOS Software 05:00

Lesson 53: Licensing Cisco Products 03:32

Lesson 54: The Cisco IOS Functions 03:19

Lesson 55: The Cisco IOS Booting Process 05:24

Lesson 56: NVRAM, Flash, RAM and Booting Sequence 06:28

Lesson 57: Cisco IOS Modes - The Exec and Privilege Exec Modes 05:09

Lesson 58: Cisco IOS Modes - The Global Configuration Mode 08:19

Lesson 59: Network Simulations Software 03:38

Lesson 60: Creating a Simple Network in Cisco Packet Tracer 03:11

Lesson 61: Configuring IPv4 Addresses on Cisco Routers 02:25

Lesson 62: Basic Packet Tracer Devices Connectivity 03:40

Lesson 63: Configuring Interfaces on Cisco devices 05:02

Lesson 64: Basic Security Configurations of a Switch 07:13

Lesson 65: Configuring the Default VLAN of a Switch and Saving Switch Configurations 03:39

Lesson 66: Verifying Switch Configurations with Show Commands 04:00

Lesson 67: Configure Auto MDIX on a Cisco Switch 02:07

Lesson 68: Network Simulation - Cisco Modelling Lab 05:18

Lesson 69: Remote VPN Access (SSH & Telnet via Putty and Tera Term 05:54

Lesson 70: Remote VPN Access (SSH & Telnet via Putty and Tera Term 11:35

Lesson 71: Show Version and Show Flash Commands 03:59

Lesson 72: Copying Cisco IOS from a TFTP server to a Router 06:25

Lesson 73: Installing new Cisco IOS from TFTP Server - Part 1 04:40

Lesson 74: Installing new Cisco IOS from TFTP Server - Part 2 02:46

Lesson 75: Re-installing Deleted or Corrupted Cisco IOS 06:20

Lesson 76: Internet Control Message Protocol (ICMP) 04:46

Lesson 77: Command Prompt & IPCONFIG 04:23

Lesson 78: The Ping and Tracert commands 05:20

Lesson 79: Conclusion and final remarks 01.49

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HOW THE LAYERS OF THE OSI MODEL WORK

The International Organization for Standardization (ISO), defines how network devices should be designed to communicate with each other. The ISO has proposed a network model that allows for this communication to take place. This model has seven layers explained below. You can use the following mnemonics to remember the layers.

How to remember the 7 layers of the OSI model

• From Layer 1 up, it would be:

  Please Do Not Throw Sausage Pizza Away.

• From Layer 7 down, it would be:

  All People Seem To Need Data Processing.

The first letter in each of the mmenomics above is used to identify the first letter of the name of the layer

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OSI Model Layer 7 — The Application Layer:

The role of the application layer in the OSI model is to connect you to your computer or data server. For example, if you wish to upload a data page from a website, your web browser uses the Hypertext Transport Protocol (HTTP) application protocol. To upgrade to a new web browser or web software, you only need to understand that one-page application protocol. Your HTTP data request moves across layers on your computer, through the data network, and up through the network layers on the server, which finds the Hypertext Mark-up Language (HTML) file and returns it in the same way.

OSI Model Layer 6 — The Presentation Layer:

The presentation layer of the OSI model is responsible for formatting the data. This could be character formatting, such as ASCII or Unicode data format, or compression and data encryption. Think of the presentation layer as the formatting layer for the OSI model. For example, many web servers can compress data sent to web browsers. This congestion is part of the presentation layer, and needs to be understood by the presentation layer on the receiving computers.

OSI Model Layer 5 — The Session Layer:

The session layer of the OSI Model works in the background to establish a communication dialogue between the two participants in the communication process; that is, two computers per network. After you have a well-formatted data piece, the session layer confirms that it is ready to be sent over the network. For example, if the OSI model is used by mail, the application layer identifies the data on the paper, the presentation layer states that the paper must be in an envelope, and the session layer states that the envelope must be a properly formatted address - including name, street number, street name, city, province, with zip code - and possibly with return address.

OSI Model Layer 4 — The Transport Layer:

The transport layer of the OSI Model defines what kind of checks can be made to ensure the delivery of data as reliable or unreliable. Reliable delivery ensures that the data packets reach their destination and that they arrive in the same way as they were sent. Unscrupulous delivery does not guarantee that the data packets arrive at any particular order, and in fact, it does not guarantee that the data packets reach their destination, at all. To stay with the postal model, a reliable delivery allows you to request the recipient's signature and get a tracking number, while the unreliable delivery simply gives you a stamp and mailbox. While most unreliable deliveries get to where they should be, you never really know if they exist, until you somehow confirm with the team. In your data network, some data is sent indirectly, such as requesting an Internet Protocol (IP) address from a network server. Some data is sent reliably, such as storing a file on a server.

OSI Model Layer 3 — The Network Layer:

The Network layer of the OSI model uses a logical address and route. A sensible address uses a specific address for the communication protocol you are using, such as an Internet Protocol (IP) address, but may not be relevant to the physical delivery process, which uses Layer 2. The network layer also divides large pieces of data into smaller pieces of delivery. In order to proceed with the postal example from the Layer 5 conversation, you had to provide a properly formatted address so that your letter could be delivered to the building or office for delivery by the postal staff. Each part of the address has a place (or location) in which it is used, such as the zip code used by the tracking and posting department, the street address used by the postmaster, and the name of the people at the destination address. Depending on how the mail delivery starts in your organization, some of the required address details may not have been in the envelope at first. The mail delivery process may have begun by placing a letter addressed to John Smith, New York Office in your desk checkbox. The letter is picked up by your postal clerk who has entered John's office number and the street address of the New York office. He then forwarded (or forwarded) to the postal service or the courier company. In your data network, this logical address is probably your IP address, which is used as a separate Internet identifier to determine the endpoint of the connection. An IP router transmits information through a series of connected networks until the data reaches a specific computer or device.

OSI Model Layer 2 — The Data Link Layer:

The data link layer of the OSI model assigns or uses to deal with chemicals and to control internal access. If you are dealing with standard Ethernet network cards, the manufacturer provides a different global address for each card. This address is a Media Access Control (MAC) address, and is used in that data connection layer to establish communication between two devices attached to a location. The data connection layer also controls how data is exchanged between these two localized devices or network cards. Think of this layer as body language or a set of communication processes. When working with your network, the two main communication processes can be Carrier Sense Multiple Access and Collision Detection (CSMA / CD) or Carrier Sense Access Multiple and Collision Paper (CSMA / CA). In the case of standard Ethernet networks, CSMA / CD is used, while CSMA / CA is used for AppleTalk and other 802.11 wireless networks. With this definition, a layer of data link forms the distribution of eggs as well as those converted to electronic or visual signals transmitted over a network.

OSI Model Layer 1 — The Physical Layer:

The work of the application layer of the OSI Model is to perform the handling and transmission of real electronic or visual signals embedded in the visible communication media. In your network, this layer contains cables and connectors that are used to send data signal from one point to another point.

When you think of the OSI model, take a picture on the sending and receiving computers. Imagine that a piece of data goes in a process from one computer to another, and as that data passes through each layer, header, or conversion, it is made into information in each layer.

As data goes through the system, only the system layer needs to know anything about the actual data content, but each layer needs to know how to deal with the layer before and after it (for example, the session layer needs to know how to communicate with the presentation and transport layers). The ISO has thought that if a team wants to write a new session interface, they can replace it with a session cloth, unaware of layers that are farther away than before or behind it.

TCP / IP NETWORK MODEL

As is the case with the Open System Interconnection (OSI) model, TCP/IP also has its own model. The OSI model and the TCP/IP models were both created independently. The TCP/IP network model represents reality in the world, whereas the OSI mode represents an ideal. With that said, the TCP/IP network model matches the standard layered network model as it should.

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The TCP/IP network model has four basic layers:

• Network interface (layer 1)

Deals with all physical components of network connectivity between the network and the IP protocol

• Internet (layer 2)

Contains all functionality that manages the movement of data between two network devices over a routed network

• Host-to-host (layer 3)

Manages the flow of traffic between two hosts or devices, ensuring that data arrives at the application on the host for which it is targeted

• Application (layer 4)

Acts as final endpoints at either end of a communication session between two network hosts