Lesson 8 Flashcards
Which network is used for localized networking
LAN
Which type of network covers large areas and cites
WAN
Can WANs be public or private
Y
When WANs spans the globe, what are they called
GAN
With a few exceptions . most layer 2 protocols were designed to work in either one network type or the other, but not in both.
T
Who owns most of the LAN infrastructure
The company/customer
Name some WAN devices
Modem Access Server WAN Switch CSU/DSU ISDN Terminal Adapter
Types of Modems
Cable
DSL
Dial-Up
DTE
Data termination equipment
Customer device
DCE
Data communications equipment
Circuit Switching
One endpoint creates a single path to another
Circuit means a connection between two endpoints
Packet Switching
Data is transmitted in small broken units
Each packet takes the best route
Give an example of a circuit switched network
PSTN
Should you use packet switching when transmitting Media or video
No
The packets will not arrive at the same time
Virtual Circuit Switching
Switching to transfer packets on logical circuits that do not have physical resources such frequencies or time slots allocated.
Which switching technique merges Packet switching and circuit switching
Virtual switching
Name the two types of virtual switching circuit types
Permanent
Switched
Permanent
d
Switched
f
Cell Switching is similar to what
Packet switching
Cell Switching
Data is transmitted in fixed cells instead of variable length cells
If the fixed cell is not filled with data it will be filled with filler info
Which switching technique makes it easy to track how much data is moving on a network
Cell Switching
Do WANs and LANs both use buses, stars, meshes, and rings
Yes
Do WANs use multipoint and point to point connections
Yes
Topic B
Topic B
What are the types of WAN connectivity
Cable
DSL
Dial Up
DSL
Digital Subscriber Lines
Point to point connectivity over phone lines
Uses ATM technology
Operates at Layer 1 and 2
Anlog POTs uses low freq on line DSL uses high freq on line
What hampers DSL
Distance
Quality of Lines
Name the types of DSL
Asymmetric DSL
Symmetric DSL
High Bit Rate DSL
Very High Bit Rate DSL
see pg 317
Cable Internet access
Uses cable wire and cable modems for connectivity
Contention based access
Cable speed varies based on what
Number of nodes in the contention group
Dial Up Connections
PSTN connections that uses dial up modems
Slow and long connection wait times
Leased Data Lines
Path that is available 24 hours a day
Which is more expensive Leased lines or VPNs
Leased lines
Satellite Media
Provides long range comms
Hampered by weather
Topic C
Topic C
What covers a large geographic area or connects smaller networks
WAN
Describe ATM
Cell switching technology
Supports high speed voice video and data
Standardized in 1988
The glue that connects disparate networks
LAN to WAN connections made seamless
Complex and costly
Connection oriented
End to end QoS (guaranteed for virtual channels)
ATM operates at which layers
Layer 1 and 2
How is ATM data passed
In fixed packets of 53 bytes
ATM networks are made up of which device
Switches
What uses a Layer 2 addressing scheme similar to a phone number
ATM
What guarantees that ATM data is reassembled in the proper order
Cell sequencing
What is the Internet de facto standard
IP and Packet switching
What is the underlying technology for DSL
ATM
Why is ATM so versatile
Bandwidth options Types of traffic Fixed Cell size QoS Traffic shaping Real Time Data support
What are the two types of ATM network Interfaces
User to network interface
Network to network interface
Is a switch a network to network ATM interface device
Yes
Is ATM a channelized service
No
Does ATM make channel reservations
No
All bandwidth is available to all nodes
Individual ATM connections are called what
Virtual Channels
What makes virtual connections with other switches to provide a data path from an end point to another endpoint
ATM switch
Virtual channels with a common path are tied together into what
Virtual Paths
VCI
Virtual channel identifier
VPI
Virtual path identifier
How can you form a transmission path
by combining multiple virtual paths
Wha is WAN protocol that functions at layers 1 and 2 of the OSI?
Frame relay
Is Frame Relay a packet switched technology
Yes
Frame relay provides reliable communication lines and efficient error handling mechanism by
discarding erroneous data frames
Pg 323
Pg 323
