CCNA Class Day 2-
The Hardware Part of Computer Internetworking by Layer (Today layer 1 the physical layer.)
10base5 – Thicknet- up to 10 Mbps – up to 500 meters – Co-axial cable-it is the backbone of a BUS network. A very large thick cable. Connected to the computers via a transceiver. The transceiver is connected to the cable via a Dracula Vat. You must “cap” or “terminate” the end of the bus. This cap will have a very specific resistance to help eliminate echo collisions. If the cap is missing or if there is any cut in the cable the entire network will go down
10base2 – Thinnet – up to 10 Mbps – up to 200 meters – Co-axial cable – it is thinner and easier to handle than thicknet.
Net-admin 5-4-3 rule: You can have a max of 5 segments in a network; a minimum of 4 repeaters, only 3 of the 5 segments can have computers, a max of 30 pcs per segment.
UTP- unshielded twisted pair – 8 wires, 4 sets of pairs
10baseT – up to 10 Mbps – up to 100 meters – UTP – can now use a hub and move to a star topology, so if you loose one segment the rest of the network stays up.
10baseF – up to 10 Mbps – Fiber optics
Hub – a physical layer device for connecting different segments of a network, Replaces a repeater.
802.11b – 11Mbps
802.11g – 54Mbps
BNC – British Naval Connector
RJ45 – Registered Jack
Straight Cable: used to connect two different types of devices or ports.
Cross Over Cable: used to connect two similar types of devices or ports.
Rollover Cable: This is a special purpose cable, like connecting a PC to the console port of a router. Pin 1 is mapped to Pin 8, 2 to 7, 3 to 6, 4 to 5, 5 to 4, 6 to 3, 7 to 2, and 8 to 1.
Cable Pin Outs
Straight Cable Pin OutCrossover cable
DTE – Data terminating equipment
DCE – Data Commutation equipment
What we will go over in the next class
Data link layer