- Point to Point & Shared Media
- Point to Point (P2P): directly connected, nothing in the way
- Shared Media: Broadcast, a layer 2 device in the way
- Power over Ethernet (PoE):
- Carrying Power over 2 pairs of Copper Cables (enough to power up some
network devices)
- Can replace an AC adapter
- PoE Terms: PSE:
- Power Sourcing Equipment (Switches, Power Injectors)
- PD: Powered Device (PCs, IP Phones, IP Cameras)
- Negotiation happens between the PSE & PD before/after starting Suppling
- Power Suppling over PoE can be from 15 - 95 Watts (Total)
- UPoE+: Universal PoE make use of all the 4pair to carry both Data&Power
Cisco Certified Network Associate (200-301 CCNA)
20
1.5 Interfaces and Cables Issues:
- Collisions: more than one device (PC) transmitting at a single time in a
shared media
- Carrier sense multiple access/collision detection,
CSMA/CD Solved it!!- Errors: Cabling Issue, Unsupported SFP
- Duplex Mismatch: Half or Full?MUST MATCH
- Speed: 10/100/1000?