Lecture 1 Flashcards
What is the internet
A collection of networks
What kind of connected devices can be in a network?
workstations, laptops, tablets, routers, switches, etc
Communication can be defined as sending and ________ messages
receiving
What is a protocol?
A method to define communication
A network ____ sends or receives data
end
A network core is what data gets ____ through
sent
An example of a network edge is a _______
printer
A switch is an example of a network _____
core
An end system is just a system of network ____
ends
Guided media are _______ links such as copper wire and optical fibre
physical
__________ media are links through the air
unguided
___________ between end systems is a service that the internet provides
Communication
2 methods to transmit information is via _____ and data
voice
You can transmit voice information by …
person, telephone, internet, recordings, or through wireless methods
You can transmit data information by …
paper, disk, tape, vocally, digitally, or wirelessly
A source system includes the data _____ and ____________ device
source, transmitting
The transmitting device ______ data into electromagnetic signals
encodes
The destination system includes a receiver that…
intercepts the transmitted EM signals from the transmission system.
What are the 5 steps taken to transmit information?
- Feed info to source system
- Encode info into send-able form
- Info travels through a medium to destination system
- Destination system decodes info
- Decoded signal must be translated into a form that is understandable
A problem of point to point connections is that the source and destination may be separated by ______ distances
large
A problem of point to point connections is that ____ may be needed for only a short time
links
A problem of point to point connections is that there are too many devices that can be the ______ or __________ at any given time
source, destination
A problem of point to point connections is that the _______ may be crowded by multiple pairs of sources and destinations
medium
The problems of point-to-point connections are addressed using networking _______
protocols
A protocol is a …
method to define communication
In a ______, all devices communicate via a net of connections
network
If we have a large number of devices, ________ connections are not viable, and we opt to use a ______
dedicated, network
Using a network also ensures that our signal does not _______ when going large distances
corrupt
_______ connections are required if you want a direct connection between all workstations
n(n-1)/2
Workstations connected by one BUS lacks __________, allows only one ________ at a time, and loses signal integrity as it travels farther
robustness, message
Workstations connected in a tree structure _________ robustness, but route too much ______ through the root
increases, traffic
A ___ is a network that covers a large geographical area
WAN
A partially connected network provides lots of ________ and can have other workstations act as ____ for data
redundancy, relays
A problem that a partially connected network introduces packet ___________
mis-timing (Packets arrive to the destination out of order)
A LAN connects devices in a _____ area
small
________ switching: making a connection along a particular path and sending all data in the message through that path
Circuit
Packet switching: …
break the message into pieces and send each piece separately along its own path
Virtual circuit switching: break the message into pieces and use software to simulate a connection in a _______ switched network.
packet
When packet switching, packets sent in the order A-B-C might arrive at the destination ……. Why?
our of order. The packets each take different paths that take different amount of times
What are the 3 functions of a store and forward node?
- Receive and store incoming packets
- Check incoming packets for data corruption
- Forward the valid packets to the next node
If the queue of a store and forward node is full, all incoming packets are ______
dropped
