LANs - Local Area Networks

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Presentation transcript:

LANs - Local Area Networks Connections Routing

LANs A local area network (LAN) is a computer network that interconnects computers within a limited area such as a residence, school, laboratory, university campus or office building. By contrast, a wide area network (WAN) not only covers a larger geographic distance, but also generally involves leased telecommunication circuits. Ethernet and Wi-Fi are the two most common technologies in use for local area networks.

LAN

WIFI Wi-Fi or WiFi (/ˈwaɪfaɪ/) is a technology for wireless local area networking with devices based on the IEEE 802.11 standards. Wi-Fi is a trademark of the Wi-Fi Alliance, which restricts the use of the term Wi-Fi Certified to products that successfully complete interoperability certification testing.

Routing packets in a LAN

MAC address A media access control address (MAC address) of a device is a unique identifier assigned to network interface controllers for communications at the data link layer of a network segment. Used by Ethernet and Wifi

Message going from WS1 to WS2 192.168.1.1 11000000.10101000.00000001.00000001 IP address 192.168.1.0 11111111. 11111111 .11111111 . 00000000 Subnet mask --------------------------------------------------------- 192.168.1.0 11000000.10101000.00000001.00000000 Subnet # 192.168.1.2 11000000.10101000.00000001.00000010 IP address 192.168.1.0 11111111. 11111111 . 11111111. 00000000 Subnet mask They match so communicate via the MAC address on the same subnet.

Message going from WS1 to WS3 192.168.1.1 11000000.10101000.00000001.00000001 IP address 192.168.1.0 11111111. 11111111 .11111111 . 00000000 Subnet mask --------------------------------------------------------- 192.168.1.0 11000000.10101000.00000001.00000000 Subnet # 192.168.1.2 11000000.10101000.00000001.00000010 IP address 192.168.2.0 11111111. 11111111 . 11111111 . 00000000 Subnet mask 192.168.2.0 11000000.10101000.00000010.00000000 Subnet # They do not match so communicate via default gateway

Not Gate

Not Gate 10 and 01

NAND

Not OR

Create new gates from existing ones

4 bit Ander

XNOR gate truth table

4 bit comparator

4 bit comparator chip

Compare 2 numbers for match