Networking_Lecture_Outline - What is Networking What is...

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Unformatted text preview: What is Networking? What is Networking? What is Computer Networking? “Connecting computer systems and devices through a combination of hardware and software that allow them to communicate” Definition of a node How do Hotels Use How do Hotels Use Networking? Examples: Advantages of Computer Networks Advantages of Computer Networks Sharing Software Resources and Information Sharing of Hardware Resources Preserving Information Protecting Information Network Classifications Network Classifications Local Area Network (LAN) Metropolitan Area Network (MAN) Wide Area Network (WAN) (two types) Examples of Each Type? 3 Networking Roles a CPU can 3 Networking Roles a CPU can Play Servers – PROVIDE Clients – USE Peers – BOTH SERVERS SERVERS File Servers – share files Print Servers – uses Queues Application/Database Servers – Examples of? Mail Servers Web Servers Clients Clients Clients are usually computers or PC’s that access network services from Servers. Peers Peers Provides AND Uses network services – found in small offices PROS and CONS of Peer to Peer Networking How Does Networking Work?? How Does Networking Work?? 3 Layers of Concentration 3 Layers of Concentration Helps to determine steps in troubleshooting Layer 1 – Physical Layer Layer 2 – Datalink Layer Layer 3 – Network Layer Layer 1 – Physical Layer Layer 1 – Physical Layer Concentrate of 0’s and 1’s Unit of measurement is BITS Cable Media – Attenuation – EMI – Bandwidth Cable Types Layer 1 (cont) Layer 1 (cont) ­ UTP – Unshielded Twisted Pair ­ Most popular, most widely used in Ethernet ­ Fiber Optics Layer 1 (cont) Wireless Layer 1 (cont) Wireless Wireless – fasting growing LAN media today (LANS use fixed wireless) – 802.11b – 11mpbs, 2.4 ghz – 802.11g – 54mpbs, 2.4 ghz – 802.11a – 54mpbs, 5.0 ghz – What are non­overlapping Channels? – Advantages/Disadvantages of Wireless Layer 2 – Datalink Layer Layer 2 – Datalink Layer Deals with the PHYSICAL address on the network card Like a physical home street address Layer 3 – Network Layer Layer 3 – Network Layer Responsible for routing data BETWEEN networks (LAN’S) and determining the best route to do that. Logical Address – TCP/IP address Like a Zip Code Internet Public versus Private Addresses Networking Terms/Devices Networking Terms/Devices Repeater Repeater Repeater – amplifies signal, boosts range, fixes attenuation problems Hub Hub Connect nodes together, share total bandwidth, what layer? Switch – Layer? Switch Switch Router Router Router ­ Layer? Router (Home) Router (Home) Firewall – Layer? Firewall Firewall ...
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