Lammle 1 Flashcards
(32 cards)
broadcast domain
he set of all devices on a network segment, which are allowed to “hear” all broadcasts sent out on that specific segment
Collision domain
an Ethernet term used to describe a network scenario in which one device sends a packet out on a network segment and every other device on that same segment is forced to pay attention no matter what.
Switches create separate…
collision domains within a single broadcast domain - each and every port on a switch represents its own collision domain
Routers provide a separate…
broadcast domain for each interface
WLAN devices
These devices connect wireless devices such as computers, printers, and tablets to the network
Access Points or APs
These devices allow wireless devices to connect to a wired network (and extend a collision domain from a switch, and are typically in their own broadcast domain or what we’ll refer to as a Virtual LAN (VLAN))
WLAN Controllers
These are the devices that network administrators or network operations centers use to manage access points in medium to large to extremely large quantities
Firewalls
These devices are network security systems that monitor and control the incoming and outgoing network traffic (based on predetermined security rules, and is usually an Intrusion Protection System (IPS)).
Seven OSI Layers
- Application
- Presentation
- Session
- Transport
- Network
- Data Link
- Physical
The Application layer
marks the spot where users actually communicate to the computer
The Presentation layer responsible for..
responsible for data translation and code formatting
The Session layer responsible for..
managing, and dismantling sessions between Presentation layer entities and keeping user data separate.
Dialog control between devices also occurs at this layer
Simplex communication
simple one-way communication
Half-duplex communication
actual two-way communication, but it can take place in only one direction at a time
full-duplex communication
like a real conversation where devices can transmit and receive at the same time
The Transport layer
segments and reassembles data into a single data stream
The three-way handshake
- The first “connection agreement” segment is a request for synchronization (SYN).
- syn-ack
- The final segment is an acknowledgment
flow control
Flow control prevents a sending host on one side of the connection from overflowing the buffers in the receiving host
A service is considered connection-oriented if it has the following characteristics:
A virtual circuit, or “three-way handshake,” is set up.
It uses sequencing.
It uses acknowledgments.
It uses flow control.
window.
The quantity of data segments, measured in bytes, that the transmitting machine is allowed to send without receiving an acknowledgment
session multiplexing
When the Transport layer, working in tandem with the Session layer, separates the data from different applications
The Network layer
Manages device addressing, tracks the location of devices on the network, and determines the best way to move data
Data Packets
These are used to transport user data through the inter-network
Route Update Packets
These packets are used to update neighboring routers about the networks connected to all routers within the
inter-network
