4.c - Physical Network Topology Flashcards
Wired LANs
transported over network cabling that runs through a building
Typology of network cabling
• Star : A separate cable is run from a central location to each computer. Every host (computer) is connected to a central hub or switch
- Ring : Consists of cable that runs from one computer to the next.
- Bus : Consist of a central cable, with connectors along its length that would facilitate “branches” cable that would be connected to individual computers.
Fiber optic cabling
use pulses of light instead of electrical signals through metal cabling to transmit information. They have higher bandwidth, lower loss, and are immune to EMI
Network transport protocols
- Ethernet
- ATM
- Token Ring
- USB
- FDDI protocols
Network devices on Ethernet networks
Facilitates the transmission of frame
Network adapter or Network interface card (NIC)
A devise directly connected to a computer’s bus and contains one or more connectors to which an Ethernet cable network cable may be connected
HUB
A multiport repeater used to connect all of the devices to the network
Gateway
A device that acts as a protocol converter, or perform some type of transformation of messages.
Repeater
A device that receives and re transmits the signal of an Ethernet network.
They are useful in situations in which cable lengths exceed 100 m.
A bridge
Device that is used to interconnect Ethernet networks.
Bridge vs repeater
bridge is similar to repeater, but does not propagate errors such as collisions. They only propagate well-formed packets.
Switch
similar to a hub, but with the exception that a switch will listen to traffic and learn the MAC addresses associated with each port or connector and will send packets only to destination ports.
ATM- Asynchronous Transfer Mode
It’s a link layer network protocol that unifies telecommunication and computer networks
ATM is a connection-oriented link-layer protocol
Token Ring networks
Operate thought the passage of a three-byte token frame from station to station on the network.
USB
Not a network technology but rather a workstation bus technology used to connect peripherals such as ,ice. keyboards etc.
