topic 6 Flashcards
What is the 7 layer OSI model?
- physical
- data link
- network
- transport
- session
- presentation
- application
What is TCP/IP model?
- Network Interface
- Internet
- Transport
- Aplication
What is CRC?
CRC is cyclic redundancy check. It is to verify if data is good, if data bad it will resend.
How many bits is in MAC address?
48bits
How many bits are there in a byte?
8bits
What is unicast transmission?
it is a frame that is addressed to a single device on the network.
What is broadcast transmission?
it is a frame that is addressed to every device in a broadcast domain.
What does a broadcast address look like?
FF-FF-FF-FF-FF-FF
What is TCP?
Transmission control portocol. It is a connection oriented conversation between two computers. It makes sure that the data gets to you whole complete in order.
What is UDP?
User Datagram protocol. It is not connection oriented. one computer sents the data and hopes that you’re ready for it.
What are port numbers?
port numbers help direct packet tarffic between the source and destination.
What is a WAP?
Wireless access point. A WAP is a bridging device that connects into an Ethernet network and communicates via radio waves to wireless clients.
What is SSID?
Service set identifier. It is a word of phrase used to connect wireless devices to the WAP device.
What is CSMA/CA?
CSMA/CA is the method used to prevent wireless collisions.
What is 802.11a?
- 5GHz range
- 8 channels @ 54Mbps
- 300 feet
What is 802.11b?
- 2.4Ghz range
- 3 channels @ 11Mbps
- 450 feet
What is 802.11g?
- 2.4Ghz range
- 3 channels @ 54Mbps
- backward compatible with 802.11a and 802.11b
- 300 feet
What is 802.11n?
- 2.4/5 Ghz
- up to 600Mbps
- 450 feet
What is 802.11ac?
- 5Ghz
- 1 Gbps ++
What are the components of a network?
- Ethernet hub
- Network switches
- Routers
- Firewall
What is the purpose of ethernet hub?
- distribute packets to and from devices that are connected to it
- It uses broadcast transmission
- cleans the digital signal sent to it
- works in the physical layer of OSI
What is the purpose of network switches?
- forward traffic to selected destination
- packet filtering
- unicast transmission
- works in the data link layer of OSI
What is the purpose of a router?
- router works at layer 3, the network layer.
2. forward data packets to networks
What is the purpose of firewall?
- limit access to that network from external network.
What is HIS?
hospital information system.
What does MSH stand for?
message header
What does PID stand for?
patient identification
What does NK1 stand for?
Next of Kin
What does PV1 stand for?
patient visit - doctors, dates
What does SCH stand for?
scheduling activity information
What does OBR stand for?
observation results
What does BLG stand for?
billing
What does AL1 stand for?
allergy
What are some examples of connected healthcare?
Medical Device integration @ SingHealth
it collects patients viral sign data and stores it in the electronic medical records (EMR) system wirelessly.
It helps eliminate time taken to manual record data.
