OSI
7 Layers of the OSI reference Model
Application, Presentation, Session, Transport, Network, Data Link, Physical
PDU
Protocol Data Unit
T568B
W/O, O, WG, B, WB, G, WB, B
No connectivity
Connection to the internet but no
connection to a website or application.
Telecommunications Room, Horizontal Cabling, Work Area
Layer 3 Devices
Routers and Multi-layer switches
Encapsulation/ decapsulation
Each layer adding more information, so the data gets to the correct recipient and the recipient knows what to do with the data. The same process in reverse
Dynamic Host Configuration Protocol
T568A
WG, G, WO, B, WB, O, WB, B
Limited Connectivity
DHCP problem
Explain how to tip ethernet cable
Explain
Layer 2 Devices
Switch and NIC
TCP (3 way handshake, secure), UDP (fast, connectionless)
APIPA
Automatic Private IP Addressing
Difference between Multimode and Single Mode Fiber
Multimode uses LEDs, Single mode uses lasers
Local Connectivity
Access to network resources but not the internet.
2 parts of a mac address
Organizationally Unique Identifier, Device ID
Layer 1 devices
NIC and Hub
PDUs at each layer
Bits/Bytes, Frames, Packets, Segments, Data
MU-MIMO
Multiuser, multiple input/ multiple output
IEEE standard for Gigabit Ethernet over twisted pair ( most commomnly used)
802.3ab
Slow Network Speeds
An internet connection has a maximum speed at which it can transfer data.
Low bandwidth
2 parts of an IP address
What is Plenum
Type of fire rating. If it burns, it creates less smoke and fumes
What does a frame consist of
Recipient MAC, Sender MAC, Type of Data, Data, FCS
CSMA/CD /CA
Map the run, get a floor Plan, determine location of telecommunications room, pull cable, Make connections, test cable runs
Latency and Jitter
Jitter is caused by rapid latency fluctuations. Low latency is more important than high speed
Wifi 5 standard
802.11ac 5Ghz Band. Supports MU-MIMO, speeds up to 1Gbps
What are the network topologies
Bus, Ring, Star, Mesh, Hybrid
Open Systems Interconnection
IEEE
Institute of Electrical and Electronics Engineers
Maximum length of Runs
90m
LEDs that give information about the state of the link to whatever is on the other end of the connection
Link Lights
Full/Half Duplex
Half duplex can send or receive. Full can send and receive at the same time
Three levels of permission when using the default Sharing Wizard:
Read, Read/Write, and Owner